| 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 |
| Susquehanna County | 42 238 | 40 380 | 1 858 | 4.6 |
| Apolacon township | 507 | 493 | 14 | 2.8 |
| Ararat township | 531 | 420 | 111 | 26.4 |
| Auburn township | 1 816 | 1 639 | 177 | 10.8 |
| Bridgewater township | 2 668 | 2 368 | 300 | 12.7 |
| Brooklyn township | 889 | 873 | 16 | 1.8 |
| Choconut township | 797 | 799 | - 2 | - 0.3 |
| Clifford township | 2 381 | 2 147 | 234 | 10.9 |
| Dimock township | 1 398 | 1 226 | 172 | 14.0 |
| Forest City borough | 1 855 | 1 846 | 9 | 0.5 |
| Forest Lake township | 1 194 | 1 229 | - 35 | - 2.8 |
| Franklin township | 938 | 913 | 25 | 2.7 |
| Friendsville borough | 91 | 102 | - 11 | - 10.8 |
| Gibson township | 1 129 | 1 015 | 114 | 11.2 |
| Great Bend borough | 700 | 704 | - 4 | - 0.6 |
| Great Bend township | 1 890 | 1 817 | 73 | 4.0 |
| Hallstead borough | 1 216 | 1 274 | - 58 | - 4.6 |
| Harford township | 1 301 | 1 100 | 201 | 18.3 |
| Harmony township | 558 | 544 | 14 | 2.6 |
| Herrick township | 599 | 563 | 36 | 6.4 |
| Hop Bottom borough | 333 | 345 | - 12 | - 3.5 |
| Jackson township | 788 | 757 | 31 | 4.1 |
| Jessup township | 564 | 483 | 81 | 16.8 |
| Lanesboro borough | 588 | 659 | - 71 | - 10.8 |
| Lathrop township | 835 | 794 | 41 | 5.2 |
| Lenox township | 1 832 | 1 581 | 251 | 15.9 |
| Liberty township | 1 266 | 1 353 | - 87 | - 6.4 |
| Little Meadows borough | 290 | 326 | - 36 | - 11.0 |
| Middletown township | 340 | 339 | 1 | 0.3 |
| Montrose borough | 1 664 | 1 982 | - 318 | - 16.0 |
| New Milford borough | 878 | 953 | - 75 | - 7.9 |
| New Milford township | 1 859 | 1 731 | 128 | 7.4 |
| Oakland borough | 622 | 641 | - 19 | - 3.0 |
| Oakland township | 550 | 544 | 6 | 1.1 |
| Rush township | 1 290 | 1 126 | 164 | 14.6 |
| Silver Lake township | 1 729 | 1 542 | 187 | 12.1 |
| Springville township | 1 555 | 1 424 | 131 | 9.2 |
| Susquehanna Depot borough | 1 690 | 1 760 | - 70 | - 4.0 |
| Thompson borough | 299 | 291 | 8 | 2.7 |
| Thompson township | 440 | 374 | 66 | 17.6 |
| Union Dale borough | 368 | 303 | 65 | 21.5 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||