Government Detail
Summary
| Name | Level | Type/Class | Home Rule? |
|---|---|---|---|
| Butler, County of | county | County (Class: 4) | no |
Detail
| Census Creation Date | Created | Boundary Alteration Count | Dissolved |
|---|---|---|---|
| Mar 12, 1800 | 1 |
Map
Related
Identifier
| Detail | Type | Source | Identifier | Relationship | Web Link |
|---|---|---|---|---|---|
| View | census | US Census Bureau FIPS: County | 42019 | Lead | |
| View | geologic | USGS GNIS: Civil | 1213661 | Lead | View |
| View | other | Wikidata | Q488672 | Lead | View |
| View | state | Pennsylvania DCED: County | 10 | Lead |
Affected Government
| Detail | How Affected | Adverse Government | How Adverse Affected | Date |
|---|---|---|---|---|
| View | Creation (Within) | Allegheny, County of | Part | Mar 12, 1800 |
| View | Separation | Allegheny, County of | Reduction | Nov 7, 1803 |
| View | Expansion | Armstrong, County of | Reduction | May 5, 1864 |
| View | Ascertainment | Lawrence, County of | Ascertainment | Oct 26, 2018 |
Affected Government Form
| Detail | Government Form | Date |
|---|---|---|
| View | County (Unorganized) | Mar 12, 1800 |
| View | County | Nov 7, 1803 |
| View | County, 6th Class | Jul 10, 1919 |
| View | County, 5th Class | Jan 1, 1952 |
| View | County, 4th Class | Jan 1, 1992 |
Other Successful Event Links
| Detail | Type | Description | Successful? | Date |
|---|---|---|---|---|
| View | Annexation | Northumberland County-Westmoreland County 1785 Annexation | yes+ | 1785 |
| View | New County | Allegheny County 1788 Creation | yes | Sep 24, 1788 |
| View | New Township | Allegheny County 1788 Township Division | yes | Dec 18, 1788 |
| View | New Township | Butler County 1804 Township Division | yes+ | Nov 1804 |
| View | New Borough | Butler Borough 1817 Creation | yes | Mar 14, 1817 |
| View | New Township | Cherry Township 1840 Creation | yes | Mar 7, 1840 |
| View | New Borough | Harmony Borough 1840 Creation | yes | Jun 19, 1840 |
| View | New Borough | Zelienople Borough 1840 Creation | yes | Jun 19, 1840 |
| View | Annexation | Slippery Rock Township-Cherry Township 1841 Annexation | yes* | 1841 |
| View | New Borough | Centreville Borough 1841 Creation | yes | Mar 11, 1841 |
| View | Annexation | Cherry Township-Slippery Rock Township 1842 Annexation | yes* | 1842 |
| View | New Township | North Butler Township 1842 Creation | yes+ | 1842 |
| View | New Township | Franklin Township (Butler) 1842 Creation | yes+ | 1842 |
| View | New Township | East Connoquenessing Township-West Connoquenessing Township 1843 Creation | yes+ | 1843 |
| View | New Borough | Portersville Borough 1844 Creation | yes | Dec 18, 1844 |
| View | New Township | Washington Township (PA) 1845 Creation | yes | Apr 16, 1845 |
| View | New School District | Centreville Borough 1846 School District Separation | yes* | 1846 |
| View | New Township | Fairview Township 1846 Creation | yes* | Mar 7, 1846 |
| View | New Borough | Prospect Borough 1846 Creation | yes | Apr 8, 1846 |
| View | New Borough | Harrisville Borough 1846 Creation | yes | Aug 13, 1846 |
| View | New Borough | Saxonburg Borough 1846 Creation | yes | Aug 13, 1846 |
| View | Election Separation | Centreville Borough 1852 Election Separation | yes | Apr 23, 1852 |
| View | Annexation | Mercer Township-Harrisville Borough 1853 Annexation | yes* | 1853 |
| View | General Law | Butler Borough 1853 General Law | yes | Jan 15, 1853 |
| View | General Law | Portersville Borough 1853 General Law | yes | Jan 17, 1853 |
| View | General Law | Prospect Borough 1853 Probable General Law | yes* | 1853 |
| View | New Township | Butler County 1854 Township Division | yes* | Mar 29, 1854 |
| View | Annexation | Brady Township-Franklin Township 1855 Annexation | yes* | 1854–1855 |
| View | New Borough | Millerstown Borough 1856 Creation | yes | Jun 16, 1856 |
| View | New School District | Franklin Township 1857 Independent School District | yes* | 1856–1857 |
| View | Boundary Realignment | Muddy Creek Township-Worth Township 1857 Boundary Realignment | yes* | 1857 |
| View | Annexation | Cranberry Township-Adams Township 1863 Annexation | yes | Apr 14, 1863 |
| View | Election Separation | Saxonburg Borough 1865 Election Separation | yes | Mar 10, 1865 |
| View | New Borough | West Sunbury Borough 1865 Creation | yes* | 1865 |
| View | New School District | Middlesex Township 1866 Independent School District | yes* | 1866 |
| View | School District Annexation | Allegheny Township-Perry Township 1867 School District Annexation | yes* | 1867 |
| View | New Borough | Fairview Borough (Butler) 1867 Creation | yes* | Sep 24, 1867 |
| View | School District Annexation | Butler Township-Butler Borough 1868 School District Annexation | yes* | 1868 |
| View | School District Reversion | Perry Township-Allegheny Township 1868 School District Reversion | yes* | 1868 |
| View | Election Separation | Prospect Borough 1869 Election Separation | yes* | 1869 |
| View | Annexation | Butler Township-Butler Borough 1869 Annexation | yes | Apr 2, 1869 |
| View | Annexation | Butler Township-Butler Borough 1870 Annexation | yes | Mar 28, 1870 |
| View | New School District | Jefferson Township 1873 Independent School District | yes* | 1872–1873 |
| View | School District Annexation | Parker Township-Washington Township 1873 School District Annexation | yes* | 1873 |
| View | New Borough | Petrolia Borough 1873 Creation | yes | Jan 30, 1873 |
| View | Annexation | Butler Township-Butler Borough 1873 Annexation | yes | Jun 2, 1873 |
| View | New Borough | Greece City Borough 1873 Creation | yes | Nov 6, 1873 |
| View | Annexation | Fairview Township-Karns City Borough 1875 Annexation | yes* | 1875 |
| View | New Borough | Karns City Borough 1875 Creation | yes* | Jan 4, 1875 |
| View | School District Annexation | Butler Township-Butler Borough 1876 School District Annexation | yes* | 1875–1876 |
| View | Election Separation | Millerstown Borough 1876 Election Separation | yes* | 1876 |
| View | School District Annexation | Butler Township-Butler Borough 1878 School District Annexation | yes* | 1878 |
| View | New School District | Evansburg Independent School District 1879 Creation | yes* | 1878–1879 |
| View | Dissolution | Greece City Borough-Concord Township 1879 Merger | yes* | Mar 5, 1879 |
| View | School District Annexation | Franklin Township-Prospect Borough 1880 School District Annexation | yes* | 1880 |
| View | Annexation | Fairview Township-Fairview Borough 1881 Annexation | yes* | 1881 |
| View | Boundary Realignment | Butler Township-Summit Township 1882 Boundary Realignment | yes* | 1880–1882 |
| View | New Borough | Evansburg Borough 1882 Creation | yes | Sep 7, 1882 |
| View | General Law | Saxonburg Borough 1883 General Law | yes | Jun 7, 1883 |
| View | General Law | Harrisville Borough 1884 General Law | yes | Sep 1, 1884 |
| View | New School District | Harrisville Independent School District 1885 Creation | yes* | 1885 |
| View | Annexation | Portersville Borough-Muddy Creek Township 1887 Annexation | yes | Mar 17, 1887 |
| View | General Law | Harmony Borough 1887 General Law | yes | Sep 8, 1887 |
| View | Annexation | Donegal Township-Millerstown Borough 1889 Annexation | yes* | 1889 |
| View | School District Annexation | Allegheny Township-Parker Township 1890 School District Annexation | yes* | 1890 |
| View | General Law | Zelienople Borough 1891 General Law | yes | Sep 10, 1891 |
| View | General Law | Centreville Borough 1892 General Law | yes | Mar 17, 1892 |
| View | Annexation | Jackson Township-Zelienople Borough 1893 Annexation | yes* | 1893 |
| View | New School District | Petersville Independent School District 1893 Creation | yes* | 1892–1893 |
| View | Annexation | Forward Township-Jackson Township to Evansburg Borough 1894 Annexation | yes* | 1894 |
| View | General Law | Portersville Borough 1894 General Law | yes | Mar 8, 1894 |
| View | New Borough | Mars Borough 1895 Creation | yes | Mar 23, 1895 |
| View | Annexation | Slippery Rock Township-Centreville Borough 1896 Annexation | yes | Jun 22, 1896 |
| View | New Borough | Valencia Borough 1896 Creation | yes | Sep 10, 1896 |
| View | New Borough | Connoquenessing Borough 1896 Creation | yes | Oct 16, 1896 |
| View | Annexation | Butler Township-Butler Borough 1898 Annexation | yes | Aug 15, 1898 |
| View | Township Classification | Pennsylvania 1899 Township Classification | yes | Apr 28, 1899 |
| View | New Name | Slippery Rock Borough 1900 Creation | yes | May 25, 1900 |
| View | New Borough | Eau Claire Borough 1900 Creation | yes | Dec 7, 1900 |
| View | New Borough | Bruin Borough 1901 Creation | yes | Sep 11, 1901 |
| View | Annexation | Mars Borough Ordinance 26 | yes* | 1902 |
| View | New Borough | West Liberty Borough 1903 Creation | yes | Aug 14, 1903 |
| View | Annexation | Petrolia Borough Ordinance 47 | yes* | 1904–1905 |
| View | New Borough | Callery Borough 1905 Creation | yes | Jul 3, 1905 |
| View | School District Annexation | Adams Township-Callery Borough 1906 School District Annexation | yes* | 1905–1906 |
| View | Annexation | Butler Borough Ordinance of July 1906 | yes | Jul 23, 1906 |
| View | Annexation | Butler Borough Ordinance of October 1906 | yes | Nov 6, 1906 |
| View | Annexation | Saxonburg Borough 1907 Ordinance | yes* | 1907 |
| View | Annexation | West Liberty Borough 1907 Ordinance | yes* | 1907 |
| View | Annexation | Butler Borough Ordinance of November 1907 | yes | Feb 15, 1908 |
| View | New Borough | Cherry Valley Borough 1909 Creation | yes | Sep 9, 1909 |
| View | Boundary Realignment | Forward Township-Jackson Township 1910 Boundary Ascertainment | yes* | 1910 |
| View | Annexation | Butler Borough 1911 Ordinance | yes* | Dec 12, 1911 |
| View | Annexation | Prospect Borough 1911 Ordinance | yes | Dec 22, 1911 |
| View | Annexation | Petrolia Borough 1912 Ordinance | yes* | 1912 |
| View | Annexation | Butler Borough 1910 Ordinance | yes | Mar 15, 1912 |
| View | Annexation | Butler Borough 1912 Ordinance | yes | Mar 15, 1912 |
| View | Annexation | Cherry Valley Borough 1912 Ordinance | yes* | Aug 13, 1912 |
| View | Annexation | Slippery Rock Borough Ordinance 77 | yes* | 1913–1914 |
| View | Annexation | Butler Borough 1913 Ordinance | yes* | 1913–1915 |
| View | Annexation | Butler Borough 1916 Ordinance | yes* | May 31, 1917 |
| View | Annexation | Zelienople Borough Ordinance 102 | yes* | 1918 |
| View | New City | Butler City 1918 Creation | yes | Jan 7, 1918 |
| View | Annexation | Slippery Rock Borough Ordinance 81 | yes* | 1921 |
| View | First Class Township | Butler Township 1922 1st Class | yes | Jan 2, 1922 |
| View | Annexation | Butler Township-Butler City 1926 Annexation | yes* | 1925–1926 |
| View | New Borough | East Butler Borough 1927 Creation | yes | Mar 22, 1927 |
| View | Annexation | Slippery Rock Borough Ordinance 107 | yes | May 20, 1930 |
| View | Annexation | Zelienople Borough Ordinance 151 | yes | Sep 15, 1930 |
| View | School District Dissolution | Cherry Valley Borough-Eau Claire Borough 1938 School District Merger | yes* | 1938 |
| View | School District Dissolution | Fairview Borough-Fairview Township 1938 School District Merger | yes* | 1938 |
| View | Boundary Realignment | Harmony Borough-Zelienople Borough 1940 Boundary Realignment | yes* | May 15, 1940 |
| View | Annexation | Zelienople Borough Ordinance 208 | yes | Jan 24, 1946 |
| View | Annexation | Zelienople Borough Ordinance 215 | yes | Sep 10, 1947 |
| View | Annexation | Saxonburg Borough Ordinance 143 | yes* | Dec 16, 1947 |
| View | Annexation | Petrolia Borough Ordinance 63 | yes* | Apr 28, 1948 |
| View | Annexation | Zelienople Borough Ordinance 229 | yes | Nov 9, 1949 |
| View | Annexation | Harrisville Borough 1949 Ordinance | yes* | Nov 23, 1949 |
| View | Annexation | Harmony Borough Ordinance 141 | yes | Apr 28, 1952 |
| View | Annexation | Mars Borough Ordinance 157 | yes | Aug 9, 1952 |
| View | Annexation | Harmony Borough Ordinance 146 | yes | Nov 28, 1952 |
| View | Annexation | Zelienople Borough Ordinance 254 | yes* | Feb 19, 1953 |
| View | New Name | Chicora Borough 1956 Creation | yes* | Dec 28, 1956 |
| View | Annexation | Harmony Borough Ordinance 174 | yes | Jul 16, 1957 |
| View | Annexation | Zelienople Borough Ordinance 283 | yes* | 1958 |
| View | Annexation | Butler City Ordinance 871 | yes* | Jul 2, 1958 |
| View | Annexation | Butler City Ordinance 872 | yes* | Jul 2, 1958 |
| View | Annexation | Harmony Borough Ordinance of 1 October 1957 | yes | Jul 14, 1959 |
| View | Annexation | Harmony Borough Ordinance 189 and 190 | yes | Dec 24, 1960 |
| View | Annexation | Saxonburg Borough Ordinance 173A | yes | Feb 9, 1961 |
| View | New Name | Evans City Borough 1961 Creation | yes* | Nov 7, 1961 |
| View | Boundary Realignment | Connoquenessing Township-Franklin Township 1961 Boundary Realignment | yes | Nov 22, 1961 |
| View | Annexation | Zelienople Borough Ordinance 425 | yes | Nov 23, 1962 |
| View | Annexation | Slippery Rock Borough Ordinance 220 | yes | May 22, 1963 |
| View | Annexation | Zelienople Borough Ordinance 434 | yes | Dec 3, 1964 |
| View | Annexation | Chicora Borough Ordinance 122 | yes | Nov 22, 1966 |
| View | Annexation | Callery Borough 1966 Ordinance | yes | Dec 12, 1966 |
| View | Annexation | Evans City Borough Ordinance 292 | yes | Dec 14, 1966 |
| View | Annexation | Slippery Rock Borough Ordinance 247 | yes | May 16, 1967 |
| View | Annexation | Chicora Borough Ordinance 128 | yes | Nov 8, 1967 |
| View | New Name | Evans City Borough 1968 Name Confirmation | yes | Feb 19, 1968 |
| View | Annexation | Zelienople Borough Ordinance 471 | yes | Jul 5, 1968 |
| View | Annexation | Slippery Rock Township-Slippery Rock Borough 1969 Annexation (1) | yes | Apr 2, 1969 |
| View | Annexation | Slippery Rock Township-Slippery Rock Borough 1969 Annexation (2) | yes | Apr 3, 1969 |
| View | Annexation | Evans City Borough Ordinance 317 | yes | May 26, 1969 |
| View | Annexation | Slippery Rock Township-Slippery Rock Borough 1970 Annexation | yes | Jan 16, 1970 |
| View | Annexation | Evans City Borough 1970 Ordinance | yes* | May 20, 1970 |
| View | Annexation | Chicora Borough Ordinance 145 | yes+ | 1971 |
| View | Annexation | Mars Borough Ordinance 253 | yes* | 1970–1972 |
| View | Annexation | Slippery Rock Township-Slippery Rock Borough 1979 Annexation | yes* | 1978–1979 |
| View | New Borough | Seven Fields Borough 1984 Creation | yes | Jan 2, 1984 |
| View | Annexation | Connoquenessing Township-Butler Township 1980s Annexation | yes* | 1977–1985 |
| View | Boundary Realignment | Adams Township-Seven Fields Borough 2002 Boundary Realignment | yes* | 2002 |
| View | Boundary Realignment | Adams Township-Cranberry Township 2003 Boundary Ascertainment | yes* | 1998–2003 |
| View | Boundary Realignment | Adams Township-Cranberry Township 2007 Boundary Realignment | yes* | 2004–2007 |
Government Action
| Detail | Action | Date | Approved | Effective | Location |
|---|---|---|---|---|---|
| View | Election: [For or against the incorporation of the Borough of Butler as a city of the third class by the name, style, and title of the City of Butler] | Nov 7, 1916 | |||
| View | Minute: [Proclamation classifying Butler Township as a first class township] | Jun 3, 1921 | v. 1916-1921, p. 383 | ||
| View | Proclamation: [Classifying Butler Township as a first class township] | Jun 3, 1921 | |||
| View | Election: "Do you favor the change of the Borough's name from Millerstown Borough to Chicora Borough?" | Nov 6, 1956 | |||
| View | Charter Commission Election: [For or against the election of a charter commission for the City of Butler] | Nov 5, 1957 | |||
| View | Election: "Shall the council-manager plan of the Optional Third Class City Charter Law, providing for five councilmen to be elected at large, be adopted by the City of Butler?" | Nov 4, 1958 | Rejected | ||
| View | Election | Nov 7, 1961 | |||
| View | Charter Commission Election | Nov 7, 1972 | |||
| View | Charter Commission Election | Apr 27, 1976 | Rejected | ||
| View | Election | May 15, 1979 | |||
| View | Minute | Feb 21, 1991 | v. 1989-1991, p. 238 | ||
| View | Election: "SHALL THE BOROUGH OF SEVEN FIELDS MERGE WITH AND BECOME PART OF THE TOWNSHIP OF CRANBERRY, A TOWNSHIP OF THE SECOND CLASS, THAT SHALL CONTINUE AS THE TOWNSHIP OF CRANBERRY, A TOWNSHIP OF THE SECOND CLASS, AND HAVE TOWNSHIP OFFICERS AND SUPERVISORS AS PROVIDED IN THE SECOND CLASS TOWNSHIP CODE?" | Nov 2, 1993 | |||
| View | Election: "[Shall P]arcel Number S2 G1 and S2 G2 of Bruin Borough be [merged] with and become part of the Township of Parker, [a Towns]hip of the Second Class, as such merger shall [not alt]er the classification of either municipality?" | Nov 7, 1995 | |||
| View | Election: "Shall Parcel Number S3 1 of Bruin Borough be merged with and become a part of the Township of Parker, a Township of the Second Class, as such merger shall not alter the classification of either municipality?" | Nov 7, 1995 | |||
| View | Election: "Shall Parcel Numbers 28, 29, 29a, 30 and 31 of Bruin Borough be merged with and become part of the Township of Parker, a Township of the Second Class, as such merger shall not alter the classification of either municipality?" | Nov 7, 1995 |
Research Log
| Detail | Type/Notes | Log Date | Coverage |
|---|---|---|---|
| Boroughs & Townships Docket | bk. 1–7 (1883–2000s) | ||
| Deed Grantor Index | bk. 1800-1925 (1800–1925) | ||
| Law Library Visit | |||
| Minute Book | bk. 1976-1979, p. 299 (1979-02-15)–1979-1983, p. 87 (1980-01-10) (1979) | ||
| Minute Book | bk. Planning Commission, 1979 (1979) | ||
| Miscellaneous Docket (Q.Sess.) | bk. 1–6 (1883–1902) | ||
| Miscellaneous Docket (Q.Sess.) | bk. 7–12 (1902–1916) | ||
| Miscellaneous Docket (Q.Sess.) | bk. 13–23 (1917–1969) | ||
| Miscellaneous Docket (Q.Sess.) | bk. 24–25 (1970–1995) | ||
| Open Records Request (Elections) | Jun 20, 2015 | ||
| Open Records Request (Elections) | Mar 2, 2016 | ||
| Quarter Sessions Docket | bk. 1–2 (1804–1838) | ||
| Quarter Sessions Docket | bk. 3–13 (1839–1881) | ||
| Quarter Sessions Docket | bk. 14 (1881–1886) | ||
| Road Docket | bk. 1–2 (form–1840s) | ||
| Road Index |
National Archives
| Detail | Source | Set | Government | File Unit | From | To |
|---|---|---|---|---|---|---|
| View | 1940-1950 Cns. Minor Civ. Div. Corr. | Butler County | 17500450 | 168 | 168 | |
| View | 1940-1950 Cns. Minor Civ. Div. Corr. | Butler County | 17500450 | 68 | 83 | |
| View | Cns. Mp. | 1940 | Butler County | 5837007 | 1 | 1 |
| View | Cns. Mp. | 1950 | Butler County | 34427708 | 1 | 1 |
Other Event Links
| Detail | Type | Description | Successful? | Date |
|---|---|---|---|---|
| View | New Township | Middlesex Township Proposed 1802 Division | unknown | 1802 |
| View | New Township | Slippery Rock Township Proposed 1802 Division | unknown | 1802 |
| View | Annexation | Center Township-Butler Township Proposed 1840 Annexation | no* | 1840–1841 |
| View | Plat Recording | Butler Borough 1842 Plat Recording | unknown | 1842 |
| View | Boundary Realignment | Cranberry Township-East Connoquenessing Township Proposed 1844 Boundary Realignment | unknown | 1844 |
| View | Boundary Realignment | Donegal Township-Fairview Township Proposed 1846 Boundary Realignment | no* | 1846–1847 |
| View | New Township | Butler Township-Cranberry Township-East Connoquenessing Township-Middlesex Township Proposed 1848 New Township | unknown | 1848 |
| View | New Township | Butler Township-Cranberry Township-East Connoquenessing Township-Middlesex Township Proposed 1849 New Township | unknown | 1849 |
| View | New School District | Allegheny Township-Venango Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Butler Township-Center Township-Connoquenessing Township-Franklin Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Cherry Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Connoquenessing Township-Forward Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Forward Township-Jackson Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Jefferson Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Marion Township-Venango Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Middlesex Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | North Clinton Independent School District Proposed 1856 Creation | unknown | 1856 |
| View | New School District | Parker Township Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Penn Township (Butler) Proposed 1856 Independent School District | unknown | 1856 |
| View | New School District | Portersville Borough Proposed 1856 School District Separation | unknown | 1856 |
| View | New Borough | Whitestown Borough Proposed 1860 Creation | no* | 1860 |
| View | New School District | Parker Township Proposed 1861 Independent School District | unknown | 1861 |
| View | Boundary Realignment | Center Township-Franklin Township Proposed 1863 Boundary Realignment | unknown | 1863 |
| View | New School District | Evansburg Independent School District Proposed 1864 Creation | unknown | 1864 |
| View | Boundary Realignment | Butler Township-Summit Township Proposed 1865 Boundary Realignment | unknown | 1865 |
| View | New School District | Evansburg Independent School District Proposed 1866 Creation | unknown | 1866 |
| View | New School District | Slippery Rock Township Proposed 1866 Independent School District | unknown | 1866 |
| View | New School District | Evansburg Independent School District Proposed 1867 Creation | unknown | 1867 |
| View | New School District | Forward Township-Jackson Township Proposed 1867 Independent School District | unknown | 1867 |
| View | New School District | Middlesex Township Proposed 1867 Independent School District (1) | unknown | 1867 |
| View | New School District | Middlesex Township Proposed 1867 Independent School District (2) | unknown | 1867 |
| View | Annexation | Fairview Borough 1873 Ordinance (1) | unknown | 1873 |
| View | Annexation | Fairview Borough 1873 Ordinance (2) | unknown | 1873 |
| View | New School District | Butler Township-Connoquenessing Township-Franklin Township Proposed 1874 Independent School District | no* | 1874 |
| View | School District Annexation | Franklin Township-Prospect Borough Proposed 1871 School District Annexation | unknown | 1871–1874 |
| View | New School District | Clearfield Township Proposed 1873 Independent School District | no* | 1873–1875 |
| View | New School District | Clearfield Township Proposed 1876 Independent School District | unknown | 1876 |
| View | New School District | Donegal Township Proposed 1876 Independent School District | unknown | 1876 |
| View | New Borough | Saint Joe Borough Proposed 1877 Creation | no* | 1877 |
| View | School District Annexation | Butler Township-Butler Borough Proposed 1878 School District Annexation | unknown | 1878 |
| View | School District Annexation | Franklin Township-Prospect Borough Proposed 1878 School District Annexation | unknown | 1878 |
| View | New Borough | Martinsburg Borough Proposed 1878 Creation | no* | 1878 |
| View | New School District | Butler Township-Center Township-Oakland Township-Summit Township Proposed 1884 Independent School District | no | 1884–1885 |
| View | New Township | Fairview Township Proposed 1885 Division | no* | 1885 |
| View | School District Annexation | Donegal Township-Millerstown Borough Proposed 1884 School District Annexation | no | 1884–1886 |
| View | School District Reversion | Butler Borough-Butler Township Proposed 1886 School District Reversion | unknown | 1886–1887 |
| View | School District Reversion | Butler Borough-Butler Township Proposed 1887 School District Reversion | no* | 1887 |
| View | School District Dissolution | Harrisville Independent School District Proposed 1887 Dissolution | no | 1887 |
| View | School District Dissolution | Harrisville Independent School District Proposed 1888 Dissolution | no | 1888 |
| View | School District Reversion | Butler Borough-Butler Township Proposed 1889 School District Reversion | no | 1889 |
| View | Annexation | Center Township-Franklin Township Proposed 1888 Annexation | unknown | 1888–1889 |
| View | New Name | Chicora Borough Proposed 1891 Creation | no | 1891 |
| View | School District Annexation | Butler Township-Butler Borough Proposed 1894 School District Annexation (1) | no | 1894 |
| View | School District Annexation | Butler Township-Butler Borough Proposed 1894 School District Annexation (2) | no | 1894 |
| View | Dissolution | Karns City Borough-Fairview Township Proposed 1894 Merger | no | 1894–1895 |
| View | New School District | Parker Township Proposed 1898 Independent School District | no | 1898–1899 |
| View | School District Annexation | Butler Township-Butler Borough Proposed 1907 School District Annexation | no* | 1907 |
| View | Annexation | Petrolia Borough Ordinance 50 | unknown | 1914 |
| View | Dissolution | Portersville Borough-Muddy Creek Township Proposed 1916 Merger | no | 1916 |
| View | Annexation | Petrolia Borough Ordinance 52 | unknown | 1918 |
| View | Annexation | Petrolia Borough Ordinance 53 | unknown | 1918 |
| View | Annexation | Petrolia Borough Ordinance 59 | unknown | 1926 |
| View | Annexation | Petrolia Borough Ordinance 60 | unknown | 1928 |
| View | Dissolution | West Liberty Borough-Brady Township Proposed 1935 Merger | no | 1935–1936 |
| View | Annexation | Mars Borough Ordinance 168 | unknown | 1953 |
| View | Council-Manager Form | Butler City Proposed 1957 Optional Charter | no | 1957–1958 |
| View | Annexation | Zelienople Borough Ordinance 470 | no* | 1968 |
| View | Annexation | Fairview Township-Petrolia Borough 1960s Annexation | unknown~ | 1960–1970 |
| View | Annexation | Butler Township 1971 Ordinance | no | 1971 |
| View | Boundary Realignment | Butler Township-Center Township 1960s Boundary Ascertainment | no* | 1969–1972 |
| View | Home Rule | Cranberry Township Proposed 1972 Home Rule | no* | 1972 |
| View | Home Rule | West Liberty Borough Proposed 1976 Home Rule | no* | 1976 |
| View | Dissolution | Seven Fields Borough-Cranberry Township Proposed 1993 Merger | no | 1993 |
| View | Annexation | Bruin Borough-Parker Township Proposed 1995 Annexation (Bishop) | no | 1995 |
| View | Annexation | Bruin Borough-Parker Township Proposed 1995 Annexation (Conto) | no | 1995 |
| View | Annexation | Bruin Borough-Parker Township Proposed 1995 Annexation (Peters) | no | 1995 |
| View | Annexation | Jackson Township-Harmony Borough Proposed 2001 Annexation | no* | 2001 |
| View | Boundary Realignment | Adams Township-Cranberry Township Proposed 2003 Boundary Realignment | no | 2003–2004 |