| Township/City/Village | 2010 Census | 2020 Census |
| Winchester | 1,593 | 1,574 |
| Bluffs | 715 | 618 |
| Manchester | 292 | 265 |
| Alsey | 227 | 195 |
| Glasgow | 141 | 113 |
| Naples | 130 | 100 |
Scott County| Township/City/Village | 2010 Census | 2020 Census |
| Beardstown | 6,123 | 5,951 |
| Virginia | 1,611 | 1,514 |
| Ashland | 1,333 | 1,218 |
| Chandlerville | 553 | 527 |
| Arenzville | 409 | 367 |
| Bluff Springs Township | 888 | 886 |
Cass County| Township/City/Village | 2010 Census | 2020 Census |
| Carrollton | 2,484 | 2,485 |
| White Hall | 2,520 | 2,295 |
| Roodhouse | 1,814 | 1,578 |
| Greenfield | 1,071 | 1,059 |
| Kane | 438 | 296 |
| Eldred | 201 | 149 |
| Rockbridge | 169 | 175 |
Greene County| Township/City/Village | 2010 Census | 2020 Census |
| Mt. Sterling | 2,025 | 2,006 |
| Versailles | 478 | 446 |
| Elkhorn Township | 346 | 290 |
| Lee Township | 326 | 246 |
| Mound Station | 122 | 117 |
| Buckhorn Township | 98 | 102 |
| Ripley | 86 | 53 |
Brown County| Township/City/Village | 2010 Census | 2020 Census |
| Pittsfield | 4,576 | 4,206 |
| Barry | 1,318 | 1,303 |
| Griggsville | 1,226 | 1,097 |
| Pleasant Hill | 966 | 924 |
| Newburg Township | 967 | 949 |
| Pleasant Vale Township | 570 | 484 |
| Spring Creek Township | 591 | 489 |
| Montezuma Township | 540 | 417 |
| Atlas Township | 563 | 468 |
| Hull Township | 461 | 392 |
| Perry | 397 | 314 |
| Nebo | 340 | 282 |
| New Canton Township | 359 | 334 |
| Martinsburg Township | 419 | 360 |
| Detroit | 312 | 263 |
| Milton | 271 | 214 |
| Kinderhook | 216 | 189 |
| Baylis Township | 205 | 172 |
| Chambersburg | 200 | 124 |
| Pearl | 138 | 103 |
Pike County| Township/Village/City | 2010 Census | 2020 Census |
| Springfield | 116,250 | 114,394 |
| Auburn | 4,771 | 4,574 |
| Cartwright Township | 1,482 | 1,518 |
| New Berlin | 1,346 | 1,381 |
| Pleasant Plains | 802 | 808 |
| Loami | 745 | 812 |
| Thayer | 693 | 632 |
| Island Grove Township | 621 | 549 |
| Curran | 212 | 213 |
| Berlin | 180 | 141 |
| Pawnee | 2,739 | 2,678 |
Sangamon County (partial)| Township/Village/City | 2010 Census | 2020 Census |
| Virden | 3,425 | 3,231 |
| Girard | 2,103 | 1,785 |
| Palmyra | 698 | 605 |
| Barr Township | 329 | 314 |
| Nilwood | 239 | 201 |
| Hettick | 181 | 149 |
| Modesto | 189 | 182 |
| Standard City | 152 | 135 |
| Scottville | 116 | 93 |
Macoupin County (partial)| Township/Village/City | 2010 Census | 2020 Census |
| Rushville | 3,192 | 3,005 |
| Frederick | 176 | 152 |
| Littleton | 181 | 139 |
| Browning | 137 | 117 |
| Camden | 86 | 62 |
Schuyler County| Township/Village/City | 2010 Census | 2020 Census |
| Petersburg | 2,260 | 2,258 |
| Tallula | 488 | 434 |
Menard County (partial)All numbers provided via the U.S. Census Bureau
