GeoID	Name	1980 Population Under 5 Years	1990 Population Under 5 Years	2000 Population Under 5 Years	2010 Population Under 5 Years	2020 Population Under 5 Years	1980 Population 5 to 17 Years	1990 Population 5 to 17 Years	2000 Population 5 to 17 Years	2010 Population 5 to 17 Years	2020 Population 5 to 17 Years	1980 Population 18 to 24 Years	1990 Population 18 to 24 Years	2000 Population 18 to 24 Years	2010 Population 18 to 24 Years	2020 Population 18 to 24 Years	1980 Population 25 to 44 Years	1990 Population 25 to 44 Years	2000 Population 25 to 44 Years	2010 Population 25 to 44 Years	2020 Population 25 to 44 Years	1980 Population 45 to 64 Years	1990 Population 45 to 64 Years	2000 Population 45 to 64 Years	2010 Population 45 to 64 Years	2020 Population 45 to 64 Years	1980 Population 65 Years or More	1990 Population 65 Years or More	2000 Population 65 Years or More	2010 Population 65 Years or More	2020 Population 65 Years or More	1980 Total Population (Revised)	1990 Total Population (Revised)	2000 Total Population (Revised)	2010 Total Population (Revised)	2020 Total Population
05000US42003	Allegheny County	79,245	83,932	71,081	63,640	62,818	266,909	198,611	210,095	178,023	167,577	183,167	127,080	109,491	123,613	121,605	372,068	417,363	363,251	303,443	339,038	349,105	276,958	299,332	349,570	316,680	199,591	232,505	228,416	205,059	242,860	1,450,085	1,336,449	1,281,666	1,223,348	1,250,578
05000US42005	Armstrong County	5,147	4,438	3,913	3,605	2,994	15,978	13,202	12,661	10,584	9,382	8,932	6,263	5,227	4,814	4,538	18,872	21,791	20,003	15,921	14,138	17,731	14,888	17,535	21,330	19,550	11,108	12,896	13,053	12,687	14,956	77,768	73,478	72,392	68,941	65,558
05000US42007	Beaver County	13,186	11,740	9,860	8,966	8,096	41,159	31,538	31,202	25,912	24,004	24,750	15,768	13,514	13,324	11,985	51,176	54,093	49,517	38,486	38,977	49,750	41,391	43,895	52,191	47,889	24,420	31,563	33,424	31,660	37,264	204,441	186,093	181,412	170,539	168,215
05000US42019	Butler County	10,512	10,286	11,141	9,983	9,345	32,172	27,493	31,707	31,283	29,093	19,852	16,563	15,253	16,822	18,109	40,226	47,724	51,124	43,316	43,275	29,357	29,467	40,037	54,605	55,266	15,793	20,480	24,821	27,853	38,675	147,912	152,013	174,083	183,862	193,763
05000US42051	Fayette County	10,587	8,804	8,454	6,810	6,094	33,636	26,335	25,280	20,870	18,002	17,499	12,452	11,518	10,435	9,211	38,397	41,455	40,425	32,815	29,212	36,656	30,136	36,037	41,096	37,346	22,642	26,169	26,930	24,580	28,939	159,417	145,351	148,644	136,606	128,804
05000US42059	Greene County	2,977	2,510	2,098	1,948	1,712	8,906	7,610	6,881	5,732	4,970	4,594	3,957	3,945	3,859	3,292	10,104	11,828	11,810	9,865	8,564	8,297	7,148	9,745	11,351	10,152	5,598	6,497	6,193	5,931	7,264	40,476	39,550	40,672	38,686	35,954
05000US42063	Indiana County	6,390	5,253	4,424	4,497	3,893	18,047	15,762	14,441	12,349	11,627	18,150	15,576	14,874	15,519	11,557	22,226	24,967	22,247	18,891	17,490	17,197	15,983	20,296	23,680	21,472	10,151	12,376	13,323	13,944	17,207	92,161	89,917	89,605	88,880	83,246
05000US42073	Lawrence County	7,047	5,966	5,305	4,866	4,265	20,714	16,644	16,575	14,486	12,749	13,574	8,927	7,893	7,464	6,851	26,129	26,690	24,332	20,393	18,658	25,281	20,236	22,315	26,771	23,992	14,392	17,783	18,223	17,128	19,555	107,137	96,246	94,643	91,108	86,070
05000US42125	Washington County	13,382	11,860	11,210	10,556	10,116	42,784	34,049	33,692	32,128	30,042	25,560	18,876	15,613	18,458	17,221	54,865	59,996	55,033	46,931	46,967	51,554	43,772	50,758	63,381	59,767	28,628	35,746	36,271	36,366	45,236	216,773	204,299	202,577	207,820	209,349
05000US42129	Westmoreland County	23,979	22,136	19,175	17,671	15,530	80,301	61,201	62,055	54,940	49,519	43,409	31,267	25,106	27,649	26,249	103,099	110,362	101,798	81,765	75,907	92,791	81,854	94,078	114,267	103,785	48,715	63,501	67,781	68,877	83,673	392,294	370,321	369,993	365,169	354,663
04000US42SPC	SPC Region	172,452	166,925	146,661	132,542	124,863	560,606	432,445	444,589	386,307	356,965	359,487	256,729	222,434	241,957	230,618	737,162	816,269	739,540	611,826	632,226	677,719	561,833	634,028	758,242	695,899	381,038	459,516	468,435	444,085	535,629	2,888,464	2,693,717	2,655,687	2,574,959	2,576,200