Population, Pennsylvania Counties

	2000	1990	1980	1970	1960
Pennsylvania	12,281,054	11,881,643	11,863,895	11,800,766	11,319,366

Adams	91,292	78,274	68,292	56,937	51,906
Allegheny	1,281,666	1,336,449	1,450,085	1,605,133	1,628,587
Armstrong	72,392	73,478	77,768	75,590	79,524
Beaver	181,412	186,093	204,441	208,418	206,948
Bedford	49,984	47,919	46,784	42,353	42,451

Berks	373,638	336,523	312,509	296,382	275,414
Blair	129,144	130,542	136,621	135,356	137,270
Bradford	62,761	60,967	62,919	57,962	54,925
Bucks	597,635	541,174	479,211	416,728	308,567
Butler	174,083	152,013	147,912	127,941	114,639

Cambria	152,598	163,029	183,263	186,785	203,283
Cameron	5,974	5,913	6,674	7,096	7,586
Carbon	58,802	56,846	53,285	50,573	52,889
Centre	135,758	123,786	112,760	99,267	78,580
Chester	433,501	376,396	316,660	277,746	210,608

Clarion	41,765	41,699	43,362	38,414	37,408
Clearfield	83,382	78,097	83,578	74,619	81,534
Clinton	37,914	37,182	38,971	37,721	37,619
Columbia	64,151	63,202	61,967	55,114	53,489
Crawford	90,366	86,169	88,869	81,342	77,956

Cumberland	213,674	195,257	178,541	158,177	124,816
Dauphin	251,798	237,813	232,317	223,713	220,255
Delaware	550,864	547,651	555,007	603,456	553,154
Elk	35,112	34,878	38,338	37,770	37,328
Erie	280,843	275,572	279,780	263,654	250,682

Fayette	148,644	145,351	159,417	154,667	169,340
Forest	4,946	4,802	5,072	4,926	4,485
Franklin	129,313	121,082	113,629	100,833	88,172
Fulton	14,261	13,837	12,842	10,776	10,597
Greene	40,672	39,550	40,476	36,090	39,424

Huntingdon	45,586	44,164	42,253	39,108	39,457
Indiana	89,605	89,994	92,281	79,451	75,366
Jefferson	45,932	46,083	48,303	43,695	46,792
Juniata	22,821	20,625	19,188	16,712	15,874
Lackawanna	213,295	219,039	227,908	234,504	234,531

Lancaster	470,658	422,822	362,346	320,079	278,359
Lawrence	94,643	96,246	107,150	107,374	112,965
Lebanon	120,327	113,744	108,582	99,665	90,853
Lehigh	312,090	291,130	272,349	255,304	227,536
Luzerne	319,250	328,149	343,079	341,956	346,972

Lycoming	120,044	118,710	118,416	113,296	109,367
McKean	45,936	47,131	50,635	51,915	54,517
Mercer	120,293	121,003	128,299	127,225	127,519
Mifflin	46,486	46,197	46,908	45,268	44,348
Monroe	138,687	95,709	69,409	45,422	39,567

Montgomery	750,097	678,111	643,621	624,080	516,682
Montour	18,236	17,735	16,675	16,508	16,730
Northampton	267,066	247,105	225,418	214,545	201,412
Northumberland	94,556	96,771	100,381	99,190	104,138
Perry	43,602	41,172	35,718	28,615	26,582

Philadelphia	1,517,550	1,585,577	1,688,210	1,949,996	2,002,512
Pike	46,302	27,966	18,271	11,818	9,158
Potter	18,080	16,717	17,726	16,395	16,483
Schuylkill	150,336	152,585	160,630	160,089	173,027
Snyder	37,546	36,680	33,584	29,269	25,922

Somerset	80,023	78,218	81,243	76,037	77,450
Sullivan	6,556	6,104	6,349	5,961	6,251
Susquehanna	42,238	40,380	37,876	34,344	33,137
Tioga	41,373	41,126	40,973	39,691	36,614
Union	41,624	36,176	32,870	28,603	25,646

Venango	57,565	59,381	64,444	62,353	65,295
Warren	43,863	45,050	47,449	47,682	45,582
Washington	202,897	204,584	217,074	210,876	217,271
Wayne	47,722	39,944	35,237	29,581	28,237
Westmoreland	369,993	370,321	392,294	376,935	352,629

Wyoming	28,080	28,076	26,433	19,082	16,813
York	381,751	339,574	312,963	272,603	238,336

Source: U.S. Department of Commerce, Bureau of the Census 2000, 1990, 1980, 1970, 1960, Census of Population and Housing.
Prepared by the Pennsylvania State Data Center