40 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pekin | 1 | 31,126 | 31,823 | -0.45% | 1,947 | 16 | City |
| Pekin | 2 | 27,059 | 27,620 | -0.1% | 2,199 | 12 | Township |
| Washington | 3 | 24,179 | 24,515 | 0.02% | 441 | 55 | Township |
| East Peoria | 4 | 21,919 | 22,443 | -0.48% | 1,060 | 21 | City |
| Groveland | 5 | 18,399 | 18,699 | -0.01% | 484 | 38 | Township |
| Morton | 6 | 18,178 | 17,827 | 0.03% | 508 | 36 | Township |
| Morton | 7 | 17,651 | 17,178 | 0.54% | 1,376 | 13 | Village |
| Washington | 8 | 15,805 | 16,064 | -0.33% | 1,849 | 9 | City |
| Fondulac | 9 | 12,097 | 12,323 | -0.06% | 680 | 18 | Township |
| Cincinnati | 10 | 8,750 | 8,866 | 0.01% | 313 | 28 | Township |
| Washington | 11 | 6,519 | 6,479 | 0.43% | 145 | 45 | Township |
| Creve Coeur | 12 | 4,808 | 4,927 | -0.5% | 1,136 | 4 | Village |
| Mackinaw | 13 | 4,229 | 4,282 | 0.14% | 117 | 36 | Township |
| Elm Grove | 14 | 2,939 | 2,975 | 0.07% | 82 | 36 | Township |
| Tremont | 15 | 2,641 | 2,674 | 0% | 75 | 35 | Township |
| Marquette Heights | 16 | 2,472 | 2,536 | -0.52% | 2,538 | 1 | City |
| Tremont | 17 | 2,240 | 2,274 | -0.31% | 1,876 | 1 | Village |
| Delavan | 18 | 1,907 | 1,941 | 0.05% | 63 | 30 | Township |
| Mackinaw | 19 | 1,839 | 1,882 | -0.49% | 1,531 | 1 | Village |
| Hopedale | 20 | 1,798 | 1,831 | -0.11% | 51 | 35 | Township |
| Spring Lake | 21 | 1,655 | 1,672 | 0.18% | 26 | 62 | Township |
| Delavan | 22 | 1,537 | 1,574 | -0.52% | 1,066 | 1 | City |
| Little Mackinaw | 23 | 1,431 | 1,454 | 0% | 39 | 36 | Township |
| North Pekin | 24 | 1,430 | 1,473 | -0.63% | 1,041 | 1 | Village |
| Deer Creek | 25 | 1,385 | 1,406 | -0.14% | 50 | 27 | Township |
| Sand Prairie | 26 | 1,244 | 1,270 | -0.08% | 35 | 35 | Township |
| Minier | 27 | 1,132 | 1,156 | -0.44% | 1,969 | 1 | Village |
| South Pekin | 28 | 959 | 987 | -0.62% | 1,862 | 1 | Village |
| Dillon | 29 | 935 | 946 | 0.11% | 26 | 36 | Township |
| Hopedale | 30 | 798 | 817 | -0.5% | 898 | 1 | Village |
| Deer Creek | 31 | 646 | 663 | -0.62% | 1,207 | 1 | Village |
| Green Valley | 32 | 594 | 616 | -0.83% | 1,973 | 0 | Village |
| Groveland | 33 | 559 | 563 | 0% | 15 | 37 | Township |
| Hittle | 34 | 547 | 557 | 0% | 18 | 30 | Township |
| Spring Bay | 35 | 487 | 466 | 0.83% | 708 | 1 | Village |
| Bay View Gardens | 36 | 352 | 355 | -0.28% | 619 | 1 | Village |
| Washington | 37 | 312 | 317 | -0.32% | 9 | 36 | Township |
| Armington | 38 | 302 | 311 | -0.66% | 1,060 | 0 | Village |
| Boynton | 39 | 225 | 229 | 0% | 8 | 30 | Township |
| Malone | 40 | 209 | 209 | 0.97% | 7 | 30 | Township |
Pekin is the largest city in Tazewell County, with a population of 31,126.
Malone is the smallest city in Tazewell County, with a population of 209.
There are 40 cities in Tazewell County, Illinois.