County Courthouses
| County | County Seat | Zip Code | Date Created | Parent County |
|---|---|---|---|---|
| Adams | Gettysburg | 17325 | 22 Jan 1800 | York |
| Allegheny | Pittsburgh | 15219 | 24 Sept 1788 | Westmoreland, Washington |
| Armstrong | Kittanning | 16201 | 12 Mar 1800 | Allegheny, Lycoming, Westmoreland |
| Beaver | Beaver | 15009 | 12 Mar 1800 | Allegheny, Washington |
| Bedford | Bedford | 15522 | 09 Mar 1771 | Cumberland |
| Berks | Reading | 19601 | 11 Mar 1752 | Lancaster, Chester, Philadelphia |
| Blair | Hollidaysburg | 16648 | 26 Feb 1846 | Huntingdon, Bedford |
| Bradford | Towanda | 18848 | 21 Feb 1810 | Luzerne, Lycoming |
| Bucks | Doylestown | 18901 | -- Nov 1682 | Original County |
| Butler | Butler | 16001 | 12 Mar 1800 | Allegheny |
| Cambria | Ebensburg | 15931 | 26 Mar 1804 | Huntingdon, Somerset, Bedford |
| Cameron | Emporium | 15834 | 29 Mar 1860 | Clinton, McKean, Elk, Potter |
| Carbon | Jim Thorpe | 18229 | 13 Mar 1843 | Northampton, Monroe |
| Centre | Bellefonte | 16823 | 13 Feb 1800 | Huntingdon, Lycoming, Mifflin, Northumberland |
| Chester | West Chester | 19380 | -- Nov 1682 | Original County |
| Clarion | Clarion | 16214 | 11 Mar 1839 | Venango, Armstrong |
| Clearfield | Clearfield | 16830 | 26 Mar 1804 | Huntingdon, Lycoming |
| Clinton | Lock Haven | 17745 | 21 Jun 1839 | Centre, Lycoming |
| Columbia | Bloomsburg | 17815 | 22 Mar 1813 | Northumberland |
| Crawford | Meadville | 16335 | 12 Mar 1800 | Allegheny |
| Cumberland | Carlisle | 17013 | 27 Jan 1750 | Lancaster |
| Dauphin | Harrisburg | 17101 | 04 Mar 1785 | Lancaster |
| Delaware | Media | 19063 | 26 Sep 1789 | Chester |
| Elk | Ridgway | 15853 | 18 Apr 1843 | Jefferson, McKean, Clearfield |
| Erie | Erie | 16501 | 12 Mar 1800 | Allegheny |
| Fayette | Uniontown | 15401 | 26 Sep 1783 | Westmoreland |
| Forest | Tionesta | 16353 | 11 Apr 1848
31 Oct 1866 | Jefferson
Venango |
| Franklin | Chambersburg | 17201 | 09 Sep 1784 | Cumberland |
| Fulton | McConnellsburg | 17233 | 19 Apr 1850 | Bedford |
| Greene | Waynesburg | 15370 | 09 Feb 1796 | Washington |
| Huntingdon | Huntingdon | 16652 | 20 Sep 1787 | Bedford |
| Indiana | Indiana | 15701 | 30 Mar 1803 | Westmoreland, Lycoming |
| Jefferson | Brookville | 15825 | 26 Mar 1804 | Lycoming |
| Juniata | Mifflintown | 17059 | 02 Mar 1831 | Mifflin |
| Lackawanna | Scranton | 18503 | 13 Aug 1878 | Luzerne |
| Lancaster | Lancaster | 17608 | 10 May 1729 | Chester |
| Lawrence | New Castle | 16101 | 20 Mar 1849 | Beaver, Mercer |
| Lebanon | Lebanon | 17042 | 16 Feb 1813 | Dauphin, Lancaster |
| Lehigh | Allentown | 18101 | 06 Mar 1812 | Northampton |
| Luzerne | Wilkes-Barre | 18702 | 25 Sept 1786 | Northumberland |
| Lycoming | Williamsport | 17701 | 13 Apr 1795 | Northumberland |
| McKean | Smethport | 16749 | 26 Mar 1804 | Lycoming |
| Mercer | Mercer | 16137 | 12 Mar 1800 | Allegheny |
| Mifflin | Lewistown | 17044 | 19 Sep 1789 | Cumberland, Northumberland |
| Monroe | Stroudsburg | 18360 | 01 Apr 1836 | Northampton, Pike |
| Montgomery | Norristown | 19404 | 10 Sept 1784 | Philadelphia |
| Montour | Danville | 17821 | 03 May 1850 | Columbia |
| Northampton | Easton | 18042 | 11 Mar 1752 | Bucks |
| Northumberland | Sunbury | 17801 | 21 Mar 1772 | Cumberland, Northampton, Lancaster, Berks, Bedford |
| Ontario | Renamed Bradford County 24 March 1812 | 21 Feb 1810 | Luzerne, Lycoming | |
| Perry | New Bloomfield | 17068 | 22 Mar 1820 | Cumberland |
| Philadelphia | Philadelphia | 19107 | -- Nov 1682 | Original County |
| Pike | Milford | 18337 | 26 Mar 1814 | Wayne |
| Potter | Coudersport | 16915 | 26 Mar 1804 | Lycoming |
| Schuylkill | Pottsville | 17901 | 01 Mar 1811 | Berks, Northampton |
| Snyder | Middleburg | 17842 | 02 Mar 1855 | Union |
| Somerset | Somerset | 15501 | 17 Apr 1795 | Bedford |
| Sullivan | LaPorte | 18526 | 15 Mar 1847 | Lycoming |
| Susquehanna | Montrose | 18801 | 21 Feb 1810 | Luzerne |
| Tioga | Wellsboro | 16091 | 26 Mar 1804 | Lycoming |
| Union | Lewisburg | 17837 | 22 Mar 1813 | Northumberland |
| Venango | Franklin | 16323 | 12 Mar 1800 | Allegheny, Lycoming |
| Warren | Warren | 16365 | 12 Mar 1800 | Allegheny, Lycoming |
| Washington | Washington | 15301 | 28 Mar 1781 | Westmoreland |
| Wayne | Honesdale | 18431 | 21 Mar 1798 | Northampton |
| Westmoreland | Greensburg | 15601 | 26 Feb 1773 | Bedford |
| Wyoming | Tunkhannock | 18657 | 04 Apr 1842 | Luzerne |
| York | York | 17401 | 19 Aug 1749 | Lancaster |