There are 17 cities in Piatt County, Illinois.
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 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mahomet | 1 | 10,524 | 9,520 | 2.44% | 1,082 | 9.7 | Village |
| Monticello | 2 | 6,040 | 5,950 | 0.37% | 1,558 | 3.9 | City |
| Lake Woods | 3 | 2,256 | 2,515 | -2.04% | 1,341 | 1.7 | CDP |
| Farmer City | 4 | 1,808 | 1,819 | -0.17% | 755 | 2.4 | City |
| Bement | 5 | 1,462 | 1,484 | -0.41% | 1,879 | 0.8 | Village |
| Cerro Gordo | 6 | 1,303 | 1,315 | -0.23% | 1,787 | 0.7 | Village |
| Atwood | 7 | 1,094 | 1,114 | -0.46% | 1,782 | 0.6 | Village |
| Mansfield | 8 | 925 | 936 | -0.32% | 1,821 | 0.5 | Village |
| Hammond | 9 | 499 | 506 | -0.4% | 659 | 0.8 | Village |
| De Land | 10 | 443 | 450 | -0.45% | 1,045 | 0.4 | Village |
| Weldon | 11 | 368 | 370 | -0.27% | 1,378 | 0.3 | Village |
| Seymour | 12 | 280 | 145 | -0.36% | 3,011 | 0.1 | CDP |
| Cisco | 13 | 252 | 255 | -0.4% | 1,385 | 0.2 | Village |
| Ivesdale | 14 | 251 | 263 | -1.18% | 351 | 0.7 | Village |
| White Heath | 15 | 151 | 153 | -6.21% | 443 | 0.3 | CDP |
| LaPlace | 16 | 131 | 128 | -6.43% | 201 | 0.7 | CDP |
| Garrett | 17 | 124 | 124 | 0% | 1,148 | 0.1 | 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.
Mahomet is the largest city in Piatt County.
Garrett is the smallest city in Piatt County.
There are 17 cities in Piatt County, Illinois.