| 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 |
| Fulton County | 14 261 | 13 837 | 424 | 3.1 |
| Ayr township | 1 982 | 2 167 | - 185 | - 8.5 |
| Belfast township | 1 341 | 1 208 | 133 | 11.0 |
| Bethel township | 1 420 | 1 317 | 103 | 7.8 |
| Brush Creek township | 730 | 643 | 87 | 13.5 |
| Dublin township | 1 277 | 1 146 | 131 | 11.4 |
| Licking Creek township | 1 532 | 1 410 | 122 | 8.7 |
| McConnellsburg borough | 1 073 | 1 106 | - 33 | - 3.0 |
| Taylor township | 1 237 | 1 172 | 65 | 5.5 |
| Thompson township | 998 | 1 048 | - 50 | - 4.8 |
| Todd township | 1 488 | 1 434 | 54 | 3.8 |
| Union township | 634 | 623 | 11 | 1.8 |
| Valley-Hi borough | 20 | 19 | 1 | 5.3 |
| Wells township | 529 | 544 | - 15 | - 2.8 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||