| View |
Annexation |
Franklin Township-Sewickley Township 1906 Annexation |
yes |
Sep 8, 1906 |
| View |
Dissolution |
Allegheny City-Pittsburgh City 1907 Consolidation |
yes |
Dec 6, 1907 |
| View |
New Borough |
Churchill Borough 1934 Creation |
yes |
Mar 22, 1934 |
| View |
New Borough |
Eden Park Borough 1946 Creation |
yes |
Jan 7, 1946 |
| View |
Annexation |
Fox Chapel Borough Ordinance 75 |
yes* |
Apr 18, 1947 |
| View |
New Borough |
Pleasant Hills Borough 1948 Creation |
yes |
Jan 5, 1948 |
| View |
New Borough |
Whitehall Borough 1948 Creation |
yes |
Jan 5, 1948 |
| View |
New Borough |
Baldwin Borough 1952 Creation |
yes |
Jan 7, 1952 |
| View |
New Borough |
Jefferson Borough 1952 Creation |
yes |
Jan 7, 1952 |
| View |
Annexation |
Indiana Township-Shaler Township Proposed 1950 Annexation |
no* |
1950–1953 |
| View |
First Class Township |
McCandless Township 1953 1st Class |
yes |
Jan 5, 1953 |
| View |
First Class Township |
Robinson Township 1957 1st Class |
yes |
Jan 7, 1957 |
| View |
New Name |
Penn Hills Township 1958 Creation |
yes |
Jan 6, 1958 |
| View |
New Borough |
Plum Borough 1958 Creation |
yes |
Jan 6, 1958 |
| View |
Annexation |
Sewickley Heights Borough Ordinance 65 |
yes |
Jun 3, 1958 |
| View |
Annexation |
Sewickley Heights Borough Ordinance 68 |
yes |
May 20, 1959 |
| View |
Annexation |
Forward Township-Elizabeth Borough 1959 Annexation |
yes |
Jul 15, 1959 |
| View |
Annexation |
Wilkinsburg Borough-Edgewood Borough 1959 Annexation |
yes |
Dec 30, 1959 |
| View |
New Borough |
Lincoln Borough 1960 Creation |
yes |
Jan 4, 1960 |
| View |
New Borough |
Sewickley Hills Borough 1960 Creation |
yes |
Jan 4, 1960 |
| View |
Annexation |
Oakdale Borough Ordinance 293 |
yes |
Apr 26, 1960 |
| View |
Boundary Realignment |
McCandless Township-Ross Township 1961 Boundary Ascertainment (1) |
yes |
Jan 1, 1961 |
| View |
First Class Township |
Aleppo Township 1961 1st Class |
yes |
Jan 2, 1961 |
| View |
New Name |
Bethel Park Borough 1961 Creation |
yes* |
Jan 2, 1961 |
| View |
First Class Township |
Kennedy Township 1961 1st Class |
yes |
Jan 2, 1961 |
| View |
New Borough |
Bell Acres Borough 1962 Creation |
yes |
Jan 1, 1962 |
| View |
Annexation |
Carnegie Borough Ordinance 681 |
yes |
Jul 20, 1962 |
| View |
Annexation |
Churchill Borough-Penn Hills Township 1962 Annexation |
yes |
Oct 19, 1962 |
| View |
New Borough |
Franklin Park Borough 1964 Creation |
yes |
Jan 6, 1964 |
| View |
Annexation |
Churchill Borough-Penn Hills Township 1965 Annexation |
yes |
Mar 25, 1965 |
| View |
Annexation |
Elizabeth Borough Ordinance 280 |
yes |
Nov 28, 1965 |
| View |
New Name |
South Park Township 1966 Creation |
yes |
Jun 17, 1966 |
| View |
Boundary Realignment |
Moon Township-North Fayette Township 1966 Boundary Realignment |
yes |
Jul 28, 1966 |
| View |
Boundary Realignment |
Bethel Park Borough-Upper Saint Clair Township 1966 Boundary Realignment |
yes |
Aug 11, 1966 |
| View |
Boundary Realignment |
Penn Hills Township-Plum Borough 1967 Boundary Realignment |
yes |
Mar 17, 1967 |
| View |
Annexation |
Edgeworth Borough-Sewickley Heights Borough 1967 Annexation |
yes |
Jul 6, 1967 |
| View |
Boundary Realignment |
Mount Lebanon Township-Scott Township 1967 Boundary Realignment |
yes |
Jul 6, 1967 |
| View |
Annexation |
Penn Hills Township-Churchill Borough 1967 Annexation |
yes |
Sep 18, 1967 |
| View |
Annexation |
Churchill Borough-Wilkinsburg Borough 1968 Annexation |
yes |
May 27, 1968 |
| View |
Boundary Realignment |
Lincoln Borough-Elizabeth Township 1968 Boundary Ascertainment |
yes |
Dec 31, 1968 |
| View |
Annexation |
Harmar Township-Fox Chapel Borough Proposed 1970 Annexation |
no* |
1970 |
| View |
Boundary Realignment |
Bell Acres Borough-Franklin Park Borough-Sewickley Hills Borough 1971 Boundary Ascertainment |
yes* |
1969–1971 |
| View |
Annexation |
Baldwin Borough-Whitehall Borough 1971 Annexation |
yes |
Apr 28, 1971 |
| View |
Home Rule |
McCandless Town 1975 Home Rule |
yes |
Jan 1, 1975 |
| View |
Boundary Realignment |
Collier Township-Robinson Township 1976 Boundary Ascertainment |
yes* |
1967–1976 |
| View |
Annexation |
Collier Township-Robinson Township Proposed 1973 Annexation |
no |
1973–1976 |
| View |
New Borough |
Pennsbury Village Borough 1978 Creation |
yes |
Jan 2, 1978 |
| View |
Annexation |
Monroeville Municipality-Pitcairn Borough 1982 Annexation |
yes |
Nov 18, 1982 |
| View |
Boundary Realignment |
Allegheny County-Westmoreland County 1985 Boundary Ascertainment |
yes* |
1982–1985 |
| View |
Boundary Realignment |
Allegheny County-Westmoreland County Proposed 1984 Boundary Ascertainment |
no* |
1984–1985 |
| View |
New Borough |
Wilson Borough Proposed 1985 Creation |
no |
1985 |
| View |
Boundary Realignment |
Hampton Township-Richland Township to West Deer Township 1988 Boundary Ascertainment |
yes* |
1988 |
| View |
Annexation |
West Deer Township-Richland Township Proposed 1989 Annexation |
no |
1989 |
| View |
Boundary Realignment |
Allegheny County-Westmoreland County 1991 Boundary Ascertainment |
yes* |
1990–1991 |
| View |
Boundary Realignment |
Allegheny County-Westmoreland County Proposed 1992 Boundary Ascertainment |
no* |
1992–1993 |
| View |
New Name |
Jefferson Hills Borough 1998 Creation |
yes* |
Dec 14, 1998 |