| Population Change 1990-2000 | ||||
| County or Municipality | 2000 Population | 1990 Population | Population Change | Percent Change |
| Pennsylvania | 12 281 054 | 11 881 643 | 399 411 | 3.4 |
| Erie County | 280 843 | 275 572 | 5 271 | 1.9 |
| Albion borough | 1 607 | 1 575 | 32 | 2.0 |
| Amity township | 1 140 | 1 034 | 106 | 10.3 |
| Concord township | 1 361 | 1 384 | - 23 | - 1.7 |
| Conneaut township | 3 908 | 1 938 | 1 970 | 101.7 |
| Corry city | 6 834 | 7 216 | - 382 | - 5.3 |
| Cranesville borough | 600 | 598 | 2 | 0.3 |
| Edinboro borough | 6 950 | 7 736 | - 786 | - 10.2 |
| Elgin borough | 236 | 229 | 7 | 3.1 |
| Elk Creek township | 1 800 | 1 738 | 62 | 3.6 |
| Erie city | 103 717 | 108 718 | - 5 001 | - 4.6 |
| Fairview township | 10 140 | 9 827 | 313 | 3.2 |
| Franklin township | 1 609 | 1 429 | 180 | 12.6 |
| Girard borough | 3 164 | 2 879 | 285 | 9.9 |
| Girard township | 5 133 | 4 722 | 411 | 8.7 |
| Greene township | 4 768 | 4 959 | - 191 | - 3.9 |
| Greenfield township | 1 909 | 1 770 | 139 | 7.9 |
| Harborcreek township | 15 178 | 15 108 | 70 | 0.5 |
| Lake City borough | 2 811 | 2 519 | 292 | 11.6 |
| Lawrence Park township | 4 048 | 4 310 | - 262 | - 6.1 |
| Le Boeuf township | 1 680 | 1 521 | 159 | 10.5 |
| McKean borough | 389 | 418 | - 29 | - 6.9 |
| McKean township | 4 619 | 4 503 | 116 | 2.6 |
| Millcreek township | 52 129 | 46 820 | 5 309 | 11.3 |
| Mill Village borough | 412 | 429 | - 17 | - 4.0 |
| North East borough | 4 601 | 4 617 | - 16 | - 0.3 |
| North East township | 7 702 | 6 283 | 1 419 | 22.6 |
| Platea borough | 474 | 467 | 7 | 1.5 |
| Springfield township | 3 378 | 3 218 | 160 | 5.0 |
| Summit township | 5 529 | 5 284 | 245 | 4.6 |
| Union township | 1 663 | 1 735 | - 72 | - 4.1 |
| Union City borough | 3 463 | 3 537 | - 74 | - 2.1 |
| Venango township | 2 277 | 2 235 | 42 | 1.9 |
| Washington township | 4 526 | 4 102 | 424 | 10.3 |
| Waterford borough | 1 449 | 1 492 | - 43 | - 2.9 |
| Waterford township | 3 878 | 3 402 | 476 | 14.0 |
| Wattsburg borough | 378 | 486 | - 108 | - 22.2 |
| Wayne township | 1 766 | 1 679 | 87 | 5.2 |
| Wesleyville borough | 3 617 | 3 655 | - 38 | - 1.0 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||