The following is a list of the sixty-seven county seats of the Commonwealth of Pennsylvania. The list includes forty-two boroughs, twenty-four cities, and one town. The ranking is based on the populations of each county seat during the 2010 census.

Rank	Photo	Seat name	Population (2010 census)	County	Municipal type
1		Philadelphia	1,526,006	Philadelphia	City
2		Pittsburgh	305,704	Allegheny	City
3		Allentown	118,032	Lehigh	City
4		Erie	101,786	Erie	City
5		Reading	88,082	Berks	City
6		Scranton	76,089	Lackawanna	City
7		Lancaster	59,322	Lancaster	City
8		Harrisburg	49,528	Dauphin	City
9		York	43,718	York	City
10		Wilkes-Barre	41,498	Luzerne	City
11		Norristown	34,324	Montgomery	Borough
12		Williamsport	29,381	Lycoming	City
13		Easton	26,800	Northampton	City
14		Lebanon	25,477	Lebanon	City
15		New Castle	23,273	Lawrence	City
16		Chambersburg	20,268	Franklin	Borough
17		Carlisle	18,682	Cumberland	Borough
18		West Chester	18,461	Chester	Borough
19		Greensburg	14,892	Westmoreland	City
20		Bloomsburg	14,855	Columbia	Town
21		Pottsville	14,324	Schuylkill	City
22		Indiana	13,975	Indiana	Borough
23		Butler	13,757	Butler	City
24		Washington	13,663	Washington	City
25		Meadville	13,388	Crawford	City
26		Uniontown	10,372	Fayette	City
27		Sunbury	9,905	Northumberland	City
28		Lock Haven	9,772	Clinton	City
29		Warren	9,710	Warren	City
30		Doylestown	8,380	Bucks	Borough
31		Lewistown	8,338	Mifflin	Borough
32		Gettysburg	7,620	Adams	Borough
33		Huntingdon	7,093	Huntingdon	Borough
34		Stroudsburg	6,674	Monroe	Borough
35		Franklin	6,545	Venango	City
36		Somerset	6,277	Somerset	Borough
37		Clearfield	6,215	Clearfield	Borough
38		Bellefonte	6,187	Centre	Borough
39		Lewisburg	5,792	Union	Borough
40		Hollidaysburg	5,791	Blair	Borough
41		Media	5,327	Delaware	Borough
42		Clarion	5,276	Clarion	Borough
43		Jim Thorpe	4,781	Carbon	Borough
44		Danville	4,699	Montour	Borough
45		Beaver	4,531	Beaver	Borough
46		Honesdale	4,480	Wayne	Borough
47		Waynesburg	4,176	Greene	Borough
48		Ridgway	4,078	Elk	Borough
49		Kittanning	4,044	Armstrong	Borough
50		Brookville	3,924	Jefferson	Borough
51		Ebensburg	3,351	Cambria	Borough
52		Wellsboro	3,263	Tioga	Borough
53		Towanda	2,919	Bradford	Borough
54		Bedford	2,841	Bedford	Borough
55		Coudersport	2,546	Potter	Borough
56		Emporium	2,073	Cameron	Borough
57		Mercer	2,002	Mercer	Borough
58		Tunkhannock	1,836	Wyoming	Borough
59		Smethport	1,655	McKean	Borough
60		Montrose	1,617	Susquehanna	Borough
61		Middleburg	1,309	Snyder	Borough
62		New Bloomfield	1,247	Perry	Borough
63		McConnellsburg	1,220	Fulton	Borough
64		Milford	1,021	Pike	Borough
65		Mifflintown	936	Juniata	Borough
66		Tionesta	483	Forest	Borough
67		Laporte	316	Sullivan	Borough