34 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Peoria | 1 | 111,073 | 112,942 | -0.28% | 2,308 | 48 | City |
| Peoria City | 2 | 97,405 | 97,717 | 0.43% | 2,432 | 40 | Township |
| Limestone | 3 | 18,401 | 18,289 | 0.72% | 514 | 36 | Township |
| Medina | 4 | 14,110 | 14,037 | 0.59% | 526 | 27 | Township |
| Kickapoo | 5 | 8,289 | 8,256 | 0.56% | 258 | 32 | Township |
| Chillicothe | 6 | 8,254 | 8,241 | 0.56% | 458 | 18 | Township |
| Chillicothe | 7 | 6,022 | 6,111 | -0.25% | 1,142 | 5 | City |
| Richwoods | 8 | 5,844 | 5,896 | 0.34% | 1,961 | 3 | Township |
| Bartonville | 9 | 5,789 | 5,929 | -0.4% | 719 | 8 | Village |
| Peoria Heights | 10 | 5,756 | 5,894 | -0.4% | 2,309 | 2 | Village |
| Radnor | 11 | 5,250 | 5,241 | 0.56% | 142 | 37 | Township |
| West Peoria | 12 | 4,177 | 4,257 | -0.31% | 1,983 | 2 | City |
| Elmwood | 13 | 2,485 | 2,500 | 0.36% | 69 | 36 | Township |
| Timber | 14 | 2,283 | 2,273 | 0.71% | 64 | 36 | Township |
| Elmwood | 15 | 2,026 | 2,070 | -0.34% | 1,451 | 1 | City |
| Bellevue | 16 | 1,917 | 1,874 | 0.37% | 862 | 2 | Village |
| Hollis | 17 | 1,818 | 1,812 | 0.55% | 77 | 24 | Township |
| Jubilee | 18 | 1,774 | 1,762 | 0.68% | 49 | 36 | Township |
| Princeville | 19 | 1,717 | 1,723 | -0.06% | 1,014 | 2 | Village |
| Princeville | 20 | 1,641 | 1,631 | 0.55% | 45 | 36 | Township |
| Rome | 21 | 1,599 | 1,656 | -0.62% | 44 | 36 | Township |
| Dunlap | 22 | 1,588 | 1,612 | -0.25% | 570 | 3 | Village |
| Hallock | 23 | 1,578 | 1,573 | 0.57% | 44 | 36 | Township |
| Hanna City | 24 | 1,240 | 1,263 | -0.32% | 911 | 1 | Village |
| Rosefield | 25 | 1,225 | 1,221 | 0.57% | 34 | 36 | Township |
| Brimfield | 26 | 1,182 | 1,174 | 0.77% | 32 | 36 | Township |
| Akron | 27 | 1,005 | 1,001 | 0.4% | 28 | 36 | Township |
| Trivoli | 28 | 1,005 | 1,001 | 0.6% | 28 | 36 | Township |
| Glasford | 29 | 843 | 860 | -0.35% | 928 | 1 | Village |
| Brimfield | 30 | 766 | 777 | -0.26% | 832 | 1 | Village |
| Norwood | 31 | 431 | 437 | -0.23% | 1,404 | 0 | Village |
| Kingston Mines | 32 | 265 | 271 | -0.38% | 184 | 1 | Village |
| Mapleton | 33 | 251 | 257 | -0.4% | 284 | 1 | Village |
| West Peoria | 34 | 0 | 0 | 0.00 | 2 | Township |
Peoria is the largest city in Peoria County, with a population of 111,073.
West Peoria is the smallest city in Peoria County, with a population of 0.
There are 34 cities in Peoria County, Illinois.