DECENNIAL CENSUS STATISTICS
COMMONWEALTH OF PENNSYLVANIA COUNTIES
1790 - 2000
| DECENNIAL CENSUS DATA: 1790-1890 | |||||||||||
| 1790 | 1800 | 1810 | 1820 | 1830 | 1840 | 1850 | 1860 | 1870 | 1880 | 1890 | |
| Adams County | 10,203 | 13,172 | 15,152 | 19,370 | 21,379 | 23,044 | 25,981 | 28,006 | 30,315 | 32,455 | 33,486 |
| Allegheny County | 15,087 | 25,317 | 34,921 | 50,552 | 81,235 | 138,290 | 178,831 | 262,204 | 355,869 | 551,959 | |
| Armstrong County | 2,399 | 6,143 | 10,324 | 17,701 | 28,365 | 29,560 | 35,797 | 43,382 | 47,641 | 46,747 | |
| Beaver County | 5,776 | 12,168 | 15,340 | 24,183 | 29,368 | 26,689 | 29,140 | 36,148 | 39,605 | 50,077 | |
| Bedford County | 13,132 | 12,039 | 15,746 | 20,248 | 24,502 | 29,335 | 23,052 | 26,736 | 29,635 | 34,929 | 38,644 |
| Berks County | 30,189 | 32,407 | 43,146 | 46,275 | 53,152 | 64,569 | 77,129 | 93,818 | 106,701 | 122,597 | 137,327 |
| Blair County | 21,777 | 27,829 | 38,051 | 52,740 | 70,866 | ||||||
| Bradford County | 11,554 | 19,746 | 32,769 | 42,831 | 48,734 | 53,204 | 58,541 | 59,233 | |||
| Bucks County | 25,216 | 27,496 | 32,371 | 37,842 | 45,745 | 48,107 | 56,091 | 63,578 | 64,336 | 68,656 | 70,615 |
| Butler County | 3,916 | 7,346 | 10,193 | 14,581 | 22,378 | 30,346 | 35,594 | 36,510 | 52,536 | 55,339 | |
| Cambria County | 2,117 | 3,287 | 7,076 | 11,256 | 17,773 | 29,155 | 36,569 | 46,811 | 66,375 | ||
| Cameron County | 4,273 | 5,159 | 7,238 | ||||||||
| Carbon County | 15,686 | 21,033 | 28,144 | 31,923 | 38,624 | ||||||
| Centre County | 10,681 | 13,796 | 18,879 | 20,492 | 23,355 | 27,000 | 34,418 | 37,922 | 43,269 | ||
| Chester County | 27,829 | 32,093 | 39,596 | 44,451 | 50,910 | 57,515 | 66,438 | 74,578 | 77,805 | 83,481 | 89,377 |
| Clarion County | 23,565 | 24,988 | 26,537 | 40,328 | 36,802 | ||||||
| Clearfield County | 875 | 2,342 | 4,803 | 7,834 | 12,586 | 18,759 | 25,741 | 43,408 | 69,565 | ||
| Clinton County | 8,323 | 11,207 | 17,723 | 23,211 | 26,278 | 28,685 | |||||
| Columbia County | 17,621 | 20,059 | 24,267 | 17,710 | 25,065 | 28,766 | 32,409 | 36,832 | |||
| Crawford County | 2,346 | 6,178 | 9,397 | 16,030 | 31,724 | 37,849 | 48,755 | 63,832 | 68,607 | 65,324 | |
| Cumberland County | 18,208 | 25,386 | 26,757 | 23,606 | 29,226 | 30,953 | 34,327 | 40,098 | 43,912 | 45,977 | 47,271 |
| Dauphin County | 18,155 | 22,270 | 31,883 | 21,653 | 25,243 | 30,118 | 35,754 | 46,756 | 60,740 | 76,148 | 96,977 |
| Delaware County | 9,469 | 12,809 | 14,734 | 14,810 | 17,323 | 19,791 | 24,679 | 30,597 | 39,403 | 56,101 | 74,683 |
| Elk County | 3,531 | 5,915 | 8,488 | 12,800 | 22,239 | ||||||
| Erie County | 1,468 | 3,758 | 8,553 | 17,041 | 31,344 | 38,742 | 49,432 | 65,973 | 74,688 | 86,074 | |
| Fayette County | 13,318 | 20,159 | 24,714 | 27,285 | 29,172 | 33,574 | 39,112 | ||||