| 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 |
| Cambria County | 152 598 | 163 029 | - 10 431 | - 6.4 |
| Adams township | 6 495 | 6 869 | - 374 | - 5.4 |
| Allegheny township | 2 498 | 2 075 | 423 | 20.4 |
| Ashville borough | 279 | 306 | - 27 | - 8.8 |
| Barr township | 2 175 | 2 260 | - 85 | - 3.8 |
| Blacklick township | 2 200 | 2 206 | - 6 | - 0.3 |
| Brownstown borough | 883 | 937 | - 54 | - 5.8 |
| Cambria township | 6 323 | 6 357 | - 34 | - 0.5 |
| Carrolltown borough | 1 049 | 1 286 | - 237 | - 18.4 |
| Cassandra borough | 136 | 192 | - 56 | - 29.2 |
| Chest township | 346 | 312 | 34 | 10.9 |
| Chest Springs borough | 110 | 166 | - 56 | - 33.7 |
| Clearfield township | 1 680 | 1 749 | - 69 | - 3.9 |
| Conemaugh township | 2 145 | 2 399 | - 254 | - 10.6 |
| Cresson borough | 1 631 | 1 784 | - 153 | - 8.6 |
| Cresson township | 4 055 | 3 284 | 771 | 23.5 |
| Croyle township | 2 233 | 2 451 | - 218 | - 8.9 |
| Daisytown borough | 356 | 367 | - 11 | - 3.0 |
| Dale borough | 1 503 | 1 642 | - 139 | - 8.5 |
| Dean township | 408 | 398 | 10 | 2.5 |
| East Carroll township | 1 798 | 1 951 | - 153 | - 7.8 |
| East Conemaugh borough | 1 291 | 1 470 | - 179 | - 12.2 |
| East Taylor township | 2 726 | 3 073 | - 347 | - 11.3 |
| Ebensburg borough | 3 091 | 3 872 | - 781 | - 20.2 |
| Ehrenfeld borough | 234 | 307 | - 73 | - 23.8 |
| Elder township | 990 | 1 185 | - 195 | - 16.5 |
| Ferndale borough | 1 834 | 2 020 | - 186 | - 9.2 |
| Franklin borough | 442 | 565 | - 123 | - 21.8 |
| Gallitzin borough | 1 756 | 2 003 | - 247 | - 12.3 |
| Gallitzin township | 1 310 | 1 289 | 21 | 1.6 |
| Geistown borough | 2 555 | 2 749 | - 194 | - 7.1 |
| Hastings borough | 1 398 | 1 431 | - 33 | - 2.3 |
| Jackson township | 4 925 | 5 213 | - 288 | - 5.5 |
| Johnstown city | 23 906 | 28 134 | - 4 228 | - 15.0 |
| Lilly borough | 948 | 1 162 | - 214 | - 18.4 |
| Lorain borough | 747 | 824 | - 77 | - 9.3 |
| Loretto borough | 1 190 | 1 072 | 118 | 11.0 |
| Lower Yoder township | 3 029 | 3 342 | - 313 | - 9.4 |
| Middle Taylor township | 792 | 802 | - 10 | - 1.2 |
| Munster township | 675 | 688 | - 13 | - 1.9 |
| Nanty-Glo borough | 3 054 | 3 190 | - 136 | - 4.3 |
| Northern Cambria Borough | 4 199 | 4 598 | - 399 | - 8.7 |
| Patton borough | 2 023 | 2 206 | - 183 | - 8.3 |
| Portage borough | 2 837 | 3 105 | - 268 | - 8.6 |
| Portage township | 3 906 | 4 089 | - 183 | - 4.5 |
| Reade township | 1 764 | 1 716 | 48 | 2.8 |
| Richland township | 12 598 | 12 777 | - 179 | - 1.4 |
| Sankertown borough | 680 | 770 | - 90 | - 11.7 |
| Scalp Level borough | 851 | 1 158 | - 307 | - 26.5 |
| South Fork borough | 1 138 | 1 197 | - 59 | - 4.9 |
| Southmont borough | 2 262 | 2 415 | - 153 | - 6.3 |
| Stonycreek township | 3 204 | 3 562 | - 358 | - 10.1 |
| Summerhill borough | 521 | 614 | - 93 | - 15.1 |
| Summerhill township | 2 724 | 2 798 | - 74 | - 2.6 |
| Susquehanna township | 2 198 | 2 299 | - 101 | - 4.4 |
| Tunnelhill borough | 291 | 259 | 32 | 12.4 |
| Upper Yoder township | 5 862 | 5 435 | 427 | 7.9 |
| Vintondale borough | 528 | 582 | - 54 | - 9.3 |
| Washington township | 921 | 929 | - 8 | - 0.9 |
| West Carroll township | 1 445 | 1 524 | - 79 | - 5.2 |
| Westmont borough | 5 523 | 5 789 | - 266 | - 4.6 |
| West Taylor township | 862 | 995 | - 133 | - 13.4 |
| White township | 813 | 553 | 260 | 47.0 |
| Wilmore borough | 252 | 277 | - 25 | - 9.0 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||