| 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 |
| Lebanon County | 120 327 | 113 744 | 6 583 | 5.8 |
| Annville township | 4 518 | 4 294 | 224 | 5.2 |
| Bethel township | 4 526 | 4 343 | 183 | 4.2 |
| Cleona borough | 2 148 | 2 322 | - 174 | - 7.5 |
| Cold Spring township | 49 | 3 | 46 | 1 533.3 |
| Cornwall borough | 3 486 | 3 231 | 255 | 7.9 |
| East Hanover township | 2 858 | 3 058 | - 200 | - 6.5 |
| Heidelberg township | 3 832 | 3 797 | 35 | 0.9 |
| Jackson township | 6 338 | 5 732 | 606 | 10.6 |
| Jonestown borough | 1 028 | 931 | 97 | 10.4 |
| Lebanon city | 24 461 | 24 800 | - 339 | - 1.4 |
| Millcreek township | 2 921 | 2 687 | 234 | 8.7 |
| Mount Gretna borough | 242 | 303 | - 61 | - 20.1 |
| Myerstown borough | 3 171 | 3 236 | - 65 | - 2.0 |
| North Annville township | 2 279 | 2 441 | - 162 | - 6.6 |
| North Cornwall township | 6 403 | 4 886 | 1 517 | 31.0 |
| North Lebanon township | 10 629 | 9 741 | 888 | 9.1 |
| North Londonderry township | 6 771 | 5 630 | 1 141 | 20.3 |
| Palmyra borough | 7 096 | 6 910 | 186 | 2.7 |
| Richland borough | 1 508 | 1 457 | 51 | 3.5 |
| South Annville township | 2 946 | 3 008 | - 62 | - 2.1 |
| South Lebanon township | 8 383 | 7 491 | 892 | 11.9 |
| South Londonderry township | 5 458 | 4 502 | 956 | 21.2 |
| Swatara township | 3 941 | 3 318 | 623 | 18.8 |
| Union township | 2 590 | 2 755 | - 165 | - 6.0 |
| West Cornwall township | 1 909 | 1 996 | - 87 | - 4.4 |
| West Lebanon township | 836 | 872 | - 36 | - 4.1 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||