PA · 2026 Census Gazetteer

Pennsylvania counties by area

Official, comparable measurements for 67 counties and county equivalents.

Source fields preservedGEOID · ALAND · AWATER

County equivalents67

Combined land44,742.4 mi²

Combined water1,311.5 mi²

Largest by landLycoming County

Understanding Pennsylvania’s county areas

The land-area range runs from Montour County at 130.3 mi² to Lycoming County at 1,228.9 mi². The largest has 9.4 times the land area of the smallest and accounts for 2.7% of the combined county land in Pennsylvania.

The median county-equivalent land area is 653.3 mi², above the national median of 604.5 mi². The median describes the middle of the county size distribution; it does not describe how people or development are distributed. A state with a few very large counties can have a much smaller median than its largest entry suggests.

Where water changes the picture

Erie County has the most assigned water area, at 759.1 mi². It also has the highest water share, with water making up 48.7% of its total area. Water area and water percentage answer different questions: the first measures an amount, while the second measures the mix of land and water.

Across all 67 entries, water accounts for 2.8% of the combined total area. This is calculated from the summed land and water measurements, rather than averaging county percentages, which would give each small and large county equal weight.

Compare the largest and smallest county equivalents in Pennsylvania to see land, water, and total area on the same scale.

These calculations use the 2026 Census county records listed below. County-equivalent boundaries vary between states; area alone does not measure population, density, or usable land. See coverage and calculation rules.

Complete area table

Sorted from largest to smallest land area.

#	County / equivalent	Land	Water	Water share
1	Lycoming CountyGEOID 42081	1,228.9 mi²	15 mi²	1.2%
2	Bradford CountyGEOID 42015	1,147.4 mi²	13.6 mi²	1.2%
3	Clearfield CountyGEOID 42033	1,144.9 mi²	9.3 mi²	0.8%
4	Tioga CountyGEOID 42117	1,133.9 mi²	3.2 mi²	0.3%
5	Centre CountyGEOID 42027	1,107.3 mi²	4.4 mi²	0.4%
6	Potter CountyGEOID 42105	1,081.2 mi²	0.2 mi²	0%
7	Somerset CountyGEOID 42111	1,075 mi²	6.6 mi²	0.6%
8	Westmoreland CountyGEOID 42129	1,027.7 mi²	8.2 mi²	0.8%
9	Crawford CountyGEOID 42039	1,012.4 mi²	25.2 mi²	2.4%
10	Bedford CountyGEOID 42009	1,012 mi²	4.6 mi²	0.5%
11	McKean CountyGEOID 42083	979.7 mi²	5 mi²	0.5%
12	Lancaster CountyGEOID 42071	943.9 mi²	39.9 mi²	4.1%
13	York CountyGEOID 42133	904.4 mi²	6.4 mi²	0.7%
14	Luzerne CountyGEOID 42079	889.9 mi²	16.2 mi²	1.8%
15	Clinton CountyGEOID 42035	889.8 mi²	8.9 mi²	1%
16	Warren CountyGEOID 42123	884.3 mi²	14.4 mi²	1.6%
17	Huntingdon CountyGEOID 42061	874.6 mi²	14.6 mi²	1.6%
18	Washington CountyGEOID 42125	857 mi²	3.8 mi²	0.4%
19	Berks CountyGEOID 42011	856.4 mi²	9.4 mi²	1.1%
20	Indiana CountyGEOID 42063	827.4 mi²	7 mi²	0.8%
21	Elk CountyGEOID 42047	827 mi²	4.9 mi²	0.6%
22	Susquehanna CountyGEOID 42115	823.5 mi²	8.6 mi²	1%
23	Erie CountyGEOID 42049	799 mi²	759.1 mi²	48.7%
24	Fayette CountyGEOID 42051	790.8 mi²	8 mi²	1%
25	Butler CountyGEOID 42019	789.5 mi²	6.2 mi²	0.8%
26	Schuylkill CountyGEOID 42107	778.8 mi²	4 mi²	0.5%
27	Franklin CountyGEOID 42055	772.3 mi²	0.6 mi²	0.1%
28	Chester CountyGEOID 42029	750.6 mi²	8.6 mi²	1.1%
29	Allegheny CountyGEOID 42003	730 mi²	14.3 mi²	1.9%
30	Wayne CountyGEOID 42127	725.8 mi²	25 mi²	3.3%
31	Cambria CountyGEOID 42021	688 mi²	5.3 mi²	0.8%
32	Venango CountyGEOID 42121	674.3 mi²	8.6 mi²	1.3%
33	Mercer CountyGEOID 42085	672.5 mi²	10 mi²	1.5%
34	Armstrong CountyGEOID 42005	653.3 mi²	10.7 mi²	1.6%
35	Jefferson CountyGEOID 42065	652.5 mi²	4.4 mi²	0.7%
36	Monroe CountyGEOID 42089	608.4 mi²	8.8 mi²	1.4%
37	Bucks CountyGEOID 42017	604.4 mi²	17.5 mi²	2.8%
38	Clarion CountyGEOID 42031	600.8 mi²	9 mi²	1.5%
39	Greene CountyGEOID 42059	575.9 mi²	2 mi²	0.4%
40	Perry CountyGEOID 42099	551.5 mi²	4.1 mi²	0.7%
41	Cumberland CountyGEOID 42041	545.5 mi²	4.9 mi²	0.9%
42	Pike CountyGEOID 42103	544.9 mi²	21.9 mi²	3.9%
43	Blair CountyGEOID 42013	525.1 mi²	1.3 mi²	0.2%
44	Dauphin CountyGEOID 42043	524.9 mi²	33.2 mi²	6%
45	Adams CountyGEOID 42001	518.6 mi²	3.1 mi²	0.6%
46	Columbia CountyGEOID 42037	483.3 mi²	7.2 mi²	1.5%
47	Montgomery CountyGEOID 42091	482.9 mi²	4.2 mi²	0.9%
48	Lackawanna CountyGEOID 42069	458.8 mi²	6.1 mi²	1.3%
49	Northumberland CountyGEOID 42097	457.7 mi²	19.6 mi²	4.1%
50	Sullivan CountyGEOID 42113	449.9 mi²	2.6 mi²	0.6%
51	Fulton CountyGEOID 42057	437.6 mi²	0.5 mi²	0.1%
52	Beaver CountyGEOID 42007	434.7 mi²	9.3 mi²	2.1%
53	Forest CountyGEOID 42053	427.3 mi²	3.2 mi²	0.8%
54	Mifflin CountyGEOID 42087	411 mi²	3.7 mi²	0.9%
55	Wyoming CountyGEOID 42131	397.3 mi²	7.7 mi²	1.9%
56	Cameron CountyGEOID 42023	396.1 mi²	2.2 mi²	0.5%
57	Juniata CountyGEOID 42067	391.4 mi²	2.1 mi²	0.5%
58	Carbon CountyGEOID 42025	381.4 mi²	6.1 mi²	1.6%
59	Northampton CountyGEOID 42095	369.8 mi²	7.4 mi²	2%
60	Lebanon CountyGEOID 42075	361.8 mi²	0.7 mi²	0.2%
61	Lawrence CountyGEOID 42073	357.4 mi²	4.4 mi²	1.2%
62	Lehigh CountyGEOID 42077	345.3 mi²	2.9 mi²	0.8%
63	Snyder CountyGEOID 42109	328.8 mi²	2.8 mi²	0.8%
64	Union CountyGEOID 42119	316 mi²	1.8 mi²	0.6%
65	Delaware CountyGEOID 42045	183.8 mi²	6.8 mi²	3.6%
66	Philadelphia CountyGEOID 42101	134.3 mi²	8.1 mi²	5.7%
67	Montour CountyGEOID 42093	130.3 mi²	2 mi²	1.5%

How to read this table. Land and water areas are Census statistical measurements in square miles. Adding county rows can differ slightly from separately published state totals because of rounding and geographic treatment.