| 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 |
| Berks County | 373 638 | 336 523 | 37 115 | 11.0 |
| Adamstown borough | 2 | 0 | 2 | - |
| Albany township | 1 662 | 1 547 | 115 | 7.4 |
| Alsace township | 3 689 | 3 459 | 230 | 6.6 |
| Amity township | 8 867 | 6 434 | 2 433 | 37.8 |
| Bally borough | 1 062 | 973 | 89 | 9.1 |
| Bechtelsville borough | 931 | 884 | 47 | 5.3 |
| Bern township | 6 758 | 6 303 | 455 | 7.2 |
| Bernville borough | 865 | 789 | 76 | 9.6 |
| Bethel township | 4 166 | 3 676 | 490 | 13.3 |
| Birdsboro borough | 5 064 | 4 222 | 842 | 19.9 |
| Boyertown borough | 3 940 | 3 759 | 181 | 4.8 |
| Brecknock township | 4 459 | 3 770 | 689 | 18.3 |
| Caernarvon township | 2 312 | 1 951 | 361 | 18.5 |
| Centerport borough | 327 | 284 | 43 | 15.1 |
| Centre township | 3 631 | 3 154 | 477 | 15.1 |
| Colebrookdale township | 5 270 | 5 469 | - 199 | - 3.6 |
| Cumru township | 13 816 | 13 142 | 674 | 5.1 |
| District township | 1 449 | 1 211 | 238 | 19.7 |
| Douglass township | 3 327 | 3 570 | - 243 | - 6.8 |
| Earl township | 3 050 | 3 016 | 34 | 1.1 |
| Exeter township | 21 161 | 17 260 | 3 901 | 22.6 |
| Fleetwood borough | 4 018 | 3 478 | 540 | 15.5 |
| Greenwich township | 3 386 | 2 977 | 409 | 13.7 |
| Hamburg borough | 4 114 | 3 987 | 127 | 3.2 |
| Heidelberg township | 1 636 | 1 513 | 123 | 8.1 |
| Hereford township | 3 174 | 3 026 | 148 | 4.9 |
| Jefferson township | 1 604 | 1 410 | 194 | 13.8 |
| Kenhorst borough | 2 679 | 2 918 | - 239 | - 8.2 |
| Kutztown borough | 5 067 | 4 704 | 363 | 7.7 |
| Laureldale borough | 3 759 | 3 726 | 33 | 0.9 |
| Leesport borough | 1 805 | 1 270 | 535 | 42.1 |
| Lenhartsville borough | 173 | 195 | - 22 | - 11.3 |
| Longswamp township | 5 608 | 5 387 | 221 | 4.1 |
| Lower Alsace township | 4 478 | 4 627 | - 149 | - 3.2 |
| Lower Heidelberg township | 4 150 | 2 209 | 1 941 | 87.9 |
| Lyons borough | 504 | 499 | 5 | 1.0 |
| Maidencreek township | 6 553 | 3 397 | 3 156 | 92.9 |
| Marion township | 1 573 | 1 415 | 158 | 11.2 |
| Maxatawny township | 5 982 | 5 724 | 258 | 4.5 |
| Mohnton borough | 2 963 | 2 484 | 479 | 19.3 |
| Mount Penn borough | 3 016 | 2 883 | 133 | 4.6 |
| Muhlenberg township | 16 305 | 14 127 | 2 178 | 15.4 |
| New Morgan borough | 35 | 36 | - 1 | - 2.8 |
| North Heidelberg township | 1 325 | 1 288 | 37 | 2.9 |
| Oley township | 3 583 | 3 362 | 221 | 6.6 |
| Ontelaunee township | 1 217 | 1 359 | - 142 | - 10.4 |
| Penn township | 1 993 | 1 831 | 162 | 8.8 |
| Perry township | 2 517 | 2 516 | 1 | 0.0 |
| Pike township | 1 677 | 1 359 | 318 | 23.4 |
| Reading city | 81 207 | 78 380 | 2 827 | 3.6 |
| Richmond township | 3 500 | 3 439 | 61 | 1.8 |
| Robeson township | 6 869 | 5 972 | 897 | 15.0 |
| Robesonia borough | 2 036 | 1 944 | 92 | 4.7 |
| Rockland township | 3 765 | 2 675 | 1 090 | 40.7 |
| Ruscombmanor township | 3 776 | 3 129 | 647 | 20.7 |
| St. Lawrence borough | 1 812 | 1 542 | 270 | 17.5 |
| Shillington borough | 5 059 | 5 062 | - 3 | - 0.1 |
| Shoemakersville borough | 2 124 | 1 443 | 681 | 47.2 |
| Sinking Spring borough | 2 639 | 2 467 | 172 | 7.0 |
| South Heidelberg township | 5 491 | 4 382 | 1 109 | 25.3 |
| Spring township | 21 805 | 18 899 | 2 906 | 15.4 |
| Strausstown borough | 339 | 353 | - 14 | - 4.0 |
| Tilden township | 3 553 | 2 622 | 931 | 35.5 |
| Topton borough | 1 948 | 1 987 | - 39 | - 2.0 |
| Tulpehocken township | 3 290 | 2 843 | 447 | 15.7 |
| Union township | 3 453 | 3 440 | 13 | 0.4 |
| Upper Bern township | 1 479 | 1 458 | 21 | 1.4 |
| Upper Tulpehocken township | 1 495 | 1 289 | 206 | 16.0 |
| Washington township | 3 354 | 2 799 | 555 | 19.8 |
| Wernersville borough | 2 150 | 1 934 | 216 | 11.2 |
| West Lawn borough | 1 597 | 1 606 | - 9 | - 0.6 |
| West Reading borough | 4 049 | 4 142 | - 93 | - 2.2 |
| Windsor township | 2 392 | 2 101 | 291 | 13.9 |
| Womelsdorf borough | 2 599 | 2 270 | 329 | 14.5 |
| Wyomissing borough | 8 587 | 7 332 | 1 255 | 17.1 |
| Wyomissing Hills borough | 2 568 | 2 469 | 99 | 4.0 |
| Source: U.S. Census Bureau | Prepared by: Pennsylvania State Data Center | |||