| 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 |
| Snyder County | 37 546 | 36 680 | 866 | 2.4 |
| Adams township | 852 | 833 | 19 | 2.3 |
| Beaver township | 527 | 516 | 11 | 2.1 |
| Beavertown borough | 870 | 877 | - 7 | - 0.8 |
| Center township | 2 162 | 1 986 | 176 | 8.9 |
| Chapman township | 1 426 | 1 442 | - 16 | - 1.1 |
| Franklin township | 2 094 | 2 158 | - 64 | - 3.0 |
| Freeburg borough | 584 | 640 | - 56 | - 8.8 |
| Jackson township | 1 276 | 1 383 | - 107 | - 7.7 |
| McClure borough | 975 | 1 070 | - 95 | - 8.9 |
| Middleburg borough | 1 382 | 1 422 | - 40 | - 2.8 |
| Middlecreek township | 1 971 | 1 791 | 180 | 10.1 |
| Monroe township | 4 012 | 3 881 | 131 | 3.4 |
| Penn township | 3 781 | 3 208 | 573 | 17.9 |
| Perry township | 1 973 | 1 873 | 100 | 5.3 |
| Selinsgrove borough | 5 383 | 5 384 | - 1 | 0.0 |
| Shamokin Dam borough | 1 502 | 1 690 | - 188 | - 11.1 |
| Spring township | 1 563 | 1 575 | - 12 | - 0.8 |
| Union township | 1 519 | 1 466 | 53 | 3.6 |
| Washington township | 1 532 | 1 420 | 112 | 7.9 |
| West Beaver township | 1 124 | 1 096 | 28 | 2.6 |
| West Perry township | 1 038 | 969 | 69 | 7.1 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||