| 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 |
| Centre County | 135 758 | 123 786 | 11 972 | 9.7 |
| Bellefonte borough | 6 395 | 6 358 | 37 | 0.6 |
| Benner township | 5 217 | 5 085 | 132 | 2.6 |
| Boggs township | 2 834 | 2 686 | 148 | 5.5 |
| Burnside township | 410 | 390 | 20 | 5.1 |
| Centre Hall borough | 1 079 | 1 203 | - 124 | - 10.3 |
| College township | 8 489 | 6 709 | 1 780 | 26.5 |
| Curtin township | 551 | 516 | 35 | 6.8 |
| Ferguson township | 14 063 | 9 368 | 4 695 | 50.1 |
| Gregg township | 2 119 | 1 805 | 314 | 17.4 |
| Haines township | 1 479 | 1 315 | 164 | 12.5 |
| Halfmoon township | 2 357 | 1 469 | 888 | 60.4 |
| Harris township | 4 657 | 4 167 | 490 | 11.8 |
| Howard borough | 699 | 749 | - 50 | - 6.7 |
| Howard township | 924 | 1 004 | - 80 | - 8.0 |
| Huston township | 1 311 | 1 282 | 29 | 2.3 |
| Liberty township | 1 830 | 1 747 | 83 | 4.8 |
| Marion township | 978 | 730 | 248 | 34.0 |
| Miles township | 1 573 | 1 494 | 79 | 5.3 |
| Milesburg borough | 1 187 | 1 144 | 43 | 3.8 |
| Millheim borough | 749 | 847 | - 98 | - 11.6 |
| Patton township | 11 420 | 9 971 | 1 449 | 14.5 |
| Penn township | 1 044 | 935 | 109 | 11.7 |
| Philipsburg borough | 3 056 | 3 048 | 8 | 0.3 |
| Port Matilda borough | 638 | 669 | - 31 | - 4.6 |
| Potter township | 3 339 | 3 020 | 319 | 10.6 |
| Rush township | 3 466 | 3 411 | 55 | 1.6 |
| Snow Shoe borough | 771 | 800 | - 29 | - 3.6 |
| Snow Shoe township | 1 760 | 1 756 | 4 | 0.2 |
| South Philipsburg borough | 438 | 438 | 0 | 0.0 |
| Spring township | 6 117 | 5 344 | 773 | 14.5 |
| State College borough | 38 420 | 38 923 | - 503 | - 1.3 |
| Taylor township | 741 | 714 | 27 | 3.8 |
| Union township | 1 200 | 895 | 305 | 34.1 |
| Unionville borough | 313 | 284 | 29 | 10.2 |
| Walker township | 3 299 | 2 801 | 498 | 17.8 |
| Worth township | 835 | 709 | 126 | 17.8 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||