|
Counties
|
From What Formed
|
When Formed
|
Population in 1800
|
1 |
Chester |
Original |
1682 |
32,039 |
2 |
Bucks |
Original |
1682 |
27,496 |
3 |
Philadelphia |
Original |
1682 |
81,009 |
4 |
Lancaster |
Chester |
10 May 1729 |
43,043 |
5 |
York |
Lancaster |
19 August 1749 |
25,643 |
6 |
Cumberland |
Lancaster |
27 January 1750 |
25,386 |
7 |
Berks |
Philadelphia, Bucks, Lancaster |
11 March 1752 |
32,497 |
8 |
Northampton |
Bucks |
11 March 1752 |
30,062 |
9 |
Bedford |
Cumberland |
9 March 1771 |
12,039 |
10 |
Northumberland |
Lancaster, Cumberland, Berks, Bedford,
and Northampton Counties |
27 March 1772 |
27,796 |
11 |
Westmoreland |
Bedford |
26 February 1773 |
22,726 |
12 |
Washington |
Westmoreland |
28 March 1781 |
28,293 |
13 |
Fayette |
Westmoreland |
26 September 1783 |
20, 067 |
14 |
Franklin |
Cumberland |
9 September 1784 |
19,638 |
15 |
Montgomery |
Philadelphia |
10 September 1784 |
24,150 |
16 |
Dauphin |
Lancaster |
4 march 1785 |
22,270 |
17 |
Luzerne |
Northumberland |
25 September 1786 |
12,839 |
18 |
Huntingdon |
Bedford |
20 September 1787 |
13,008 |
19 |
Allegheny |
Westmoreland and Washington |
24 September 1788 |
15,087 |
20 |
Delaware |
Chester |
26 September 1787 |
12,809 |
21 |
Mifflin |
Cumberland & Northumberland |
19 September 1789 |
13,809 |
22 |
Somerset |
Bedford |
17 April 1795 |
10,188 |
23 |
Lycoming |
Northumberland |
13 April 1796 |
5,414 |
24 |
Greene |
Washington |
9 February 1796 |
8,605 |
25 |
Wayne |
Northampton |
21 March 1798 |
2,562 |
26 |
Adams |
York |
22 January 1800 |
13,172 |
27 |
Centre |
Mifflin, Northumberland, Lycoming, &
Huntingdon |
13 February 1800 |
2,705 |
28 |
Armstrong |
Allegheny, Westmoreland, and Lycoming |
12 March 1800 |
2,399 |
29 |
Butler |
Allegheny |
12 March 1800 |
3,916 |
30 |
Beaver |
Allegheny and Washington |
12 March 1800 |
5,776 |
31 |
Crawford |
Allegheny |
12 March 1800 |
2,346 |
32 |
Erie |
Allegheny |
12 March 1800 |
- |
33 |
Mercer |
Allegheny |
12 March 1800 |
3,228 |
34 |
Venango |
Allegheny and Lycoming |
12 March 1800 |
1,130 |
35 |
Warren |
Allegheny and Lycoming |
12 March 1800 |
230 |
36 |
Indiana |
Westmoreland and Lycoming |
30 March 1803 |
|
37 |
Jefferson |
Lycoming |
26 March 1804 |
|
38 |
McKean |
Lycoming |
20 March 1804 |
|
39 |
Potter |
Lycoming |
26 March 1804 |
|
40 |
Tioga |
Lycoming |
26 March 1804 |
|
41 |
Cambria |
Huntingdon, Somerset, and Bedford |
20 March 1804 |
|
42 |
Clearfield |
Lycoming and Northumberland |
26 March 1804 |
|
43 |
Bradford |
Luzerne and Lycoming |
21 February 1810 |
|
44 |
Susquehanna |
Luzerne |
21 February 1810 |
|
45 |
Schuylkill |
Berks and Northampton |
11 March 1811 |
|
46 |
Lehigh |
Northampton |
6 March 1812 |
|
47 |
Lebanon |
Dauphin and Lancaster |
16 February 1813 |
|
48 |
Columbia |
Northumberland |
22 March 1813 |
|
49 |
Union |
Northumberland |
22 March 1813 |
|
50 |
Pike |
Wayne |
26 March 1814 |
|
51 |
Perry |
Cumberland |
22 March 1826 |
|
52 |
Juniata |
Mifflin |
2 March 1831 |
|
53 |
Monroe |
Northampton and Pike |
1 April 1836 |
|
54 |
Clarion |
Venango and Armstrong |
11 March 1839 |
|
55 |
Clinton |
Lycoming and Centre Counties |
21 June 1839 |
|
56 |
Wyoming |
Luzerne |
4 April 1842 |
|
57 |
Carbon |
Northampton and Monroe |
13 March 1843 |
|
58 |
Elk |
Jefferson, Clearfield, & McKean |
18 April 1843 |
|
59 |
Blair |
Huntingdon and Bedford |
26 February 1846 |
|
60 |
Sullivan |
Lycoming |
15 March 1847 |
|
61 |
Forest |
Jefferson & Venango |
11 April 1848 |
|
62
|
Lawrence |
Beaver and Mercer Counties |
20 March 1849 |
|
63
|
Fulton |
Bedford County |
19 April 1850 |
|
64
|
Montour |
Columbia County |
03 May 1850 |
|
65
|
Snyder |
Union County |
02 March 1855 |
|
66
|
Cameron |
Clinton, Elk, McKean, and Potter Counties |
29 March 1860 |
|
67 |
Lackawanna |
Luzerne |
13 August 1878 |
|
Map showing the
evolution of the counties, geographically
|