Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pekin | 1 | 30,941 | 31,681 | -0.59% | 1,968 | 15.7 | City |
| East Peoria | 2 | 21,871 | 22,433 | -0.64% | 1,057 | 20.7 | City |
| Morton | 3 | 17,590 | 17,106 | 0.69% | 1,371 | 12.8 | Village |
| Washington | 4 | 15,759 | 16,055 | -0.47% | 1,843 | 8.6 | City |
| Creve Coeur | 5 | 4,796 | 4,924 | -0.66% | 1,134 | 4.2 | Village |
| Marquette Heights | 6 | 2,473 | 2,539 | -0.68% | 2,539 | 1.0 | City |
| Tremont | 7 | 2,233 | 2,272 | -0.45% | 1,870 | 1.2 | Village |
| Mackinaw | 8 | 1,833 | 1,881 | -0.65% | 1,526 | 1.2 | Village |
| Heritage Lake | 9 | 1,608 | 1,664 | 0.44% | 1,419 | 1.1 | CDP |
| Delavan | 10 | 1,530 | 1,572 | -0.71% | 1,061 | 1.4 | City |
| North Pekin | 11 | 1,427 | 1,473 | -0.83% | 1,039 | 1.4 | Village |
| Minier | 12 | 1,128 | 1,155 | -0.62% | 1,962 | 0.6 | Village |
| South Pekin | 13 | 959 | 987 | -0.73% | 1,862 | 0.5 | Village |
| Hopedale | 14 | 799 | 821 | -0.74% | 899 | 0.9 | Village |
| Deer Creek | 15 | 644 | 662 | -0.77% | 1,204 | 0.5 | Village |
| Green Valley | 16 | 607 | 627 | -0.82% | 2,017 | 0.3 | Village |
| Spring Bay | 17 | 481 | 467 | 0.63% | 699 | 0.7 | Village |
| Bay View Gardens | 18 | 349 | 355 | -0.57% | 613 | 0.6 | Village |
| Armington | 19 | 300 | 310 | -0.99% | 1,053 | 0.3 | Village |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Pekin is the largest city in Tazewell County.
Armington is the smallest city in Tazewell County.
There are 19 cities in Tazewell County, Illinois.