40 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pekin | 1 | 30,987 | 31,823 | -0.45% | 1,938 | 16 | City |
| Pekin | 2 | 27,033 | 27,620 | -0.1% | 2,197 | 12 | Township |
| Washington | 3 | 24,183 | 24,515 | 0.02% | 441 | 55 | Township |
| East Peoria | 4 | 21,814 | 22,443 | -0.48% | 1,055 | 21 | City |
| Groveland | 5 | 18,397 | 18,699 | -0.01% | 484 | 38 | Township |
| Morton | 6 | 18,184 | 17,827 | 0.03% | 509 | 36 | Township |
| Morton | 7 | 17,746 | 17,178 | 0.54% | 1,384 | 13 | Village |
| Washington | 8 | 15,753 | 16,064 | -0.33% | 1,842 | 9 | City |
| Fondulac | 9 | 12,090 | 12,323 | -0.06% | 680 | 18 | Township |
| Cincinnati | 10 | 8,751 | 8,866 | 0.01% | 313 | 28 | Township |
| Washington | 11 | 6,547 | 6,479 | 0.43% | 146 | 45 | Township |
| Creve Coeur | 12 | 4,784 | 4,927 | -0.5% | 1,131 | 4 | Village |
| Mackinaw | 13 | 4,235 | 4,282 | 0.14% | 117 | 36 | Township |
| Elm Grove | 14 | 2,941 | 2,975 | 0.07% | 82 | 36 | Township |
| Tremont | 15 | 2,641 | 2,674 | 0% | 75 | 35 | Township |
| Marquette Heights | 16 | 2,459 | 2,536 | -0.53% | 2,525 | 1 | City |
| Tremont | 17 | 2,233 | 2,274 | -0.31% | 1,870 | 1 | Village |
| Delavan | 18 | 1,908 | 1,941 | 0.05% | 63 | 30 | Township |
| Mackinaw | 19 | 1,831 | 1,882 | -0.44% | 1,525 | 1 | Village |
| Hopedale | 20 | 1,796 | 1,831 | -0.11% | 51 | 35 | Township |
| Spring Lake | 21 | 1,658 | 1,672 | 0.18% | 27 | 62 | Township |
| Delavan | 22 | 1,530 | 1,574 | -0.46% | 1,061 | 1 | City |
| Little Mackinaw | 23 | 1,431 | 1,454 | 0% | 39 | 36 | Township |
| North Pekin | 24 | 1,422 | 1,473 | -0.56% | 1,035 | 1 | Village |
| Deer Creek | 25 | 1,383 | 1,406 | -0.14% | 50 | 27 | Township |
| Sand Prairie | 26 | 1,243 | 1,270 | -0.08% | 35 | 35 | Township |
| Minier | 27 | 1,127 | 1,156 | -0.44% | 1,960 | 1 | Village |
| South Pekin | 28 | 954 | 987 | -0.52% | 1,852 | 1 | Village |
| Dillon | 29 | 936 | 946 | 0.11% | 26 | 36 | Township |
| Hopedale | 30 | 794 | 817 | -0.5% | 893 | 1 | Village |
| Deer Creek | 31 | 643 | 663 | -0.46% | 1,202 | 1 | Village |
| Green Valley | 32 | 590 | 616 | -0.67% | 1,960 | 0 | Village |
| Groveland | 33 | 559 | 563 | 0% | 15 | 37 | Township |
| Hittle | 34 | 547 | 557 | 0% | 18 | 30 | Township |
| Spring Bay | 35 | 491 | 466 | 0.82% | 714 | 1 | Village |
| Bay View Gardens | 36 | 352 | 355 | 0% | 619 | 1 | Village |
| Washington | 37 | 311 | 317 | -0.32% | 9 | 36 | Township |
| Armington | 38 | 300 | 311 | -0.66% | 1,053 | 0 | Village |
| Boynton | 39 | 225 | 229 | 0% | 8 | 30 | Township |
| Malone | 40 | 211 | 209 | 0.96% | 7 | 30 | Township |
Pekin is the largest city in Tazewell County, with a population of 30,987.
Malone is the smallest city in Tazewell County, with a population of 211.
There are 40 cities in Tazewell County, Illinois.