17 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Chattanooga | 1 | 190,671 | 181,568 | 0.96% | 1,339 | 142.35 | City |
| Soddy-Daisy | 2 | 13,327 | 13,094 | 0.35% | 575 | 23.18 | City |
| Red Bank | 3 | 12,161 | 11,921 | 0.4% | 1,854 | 6.56 | City |
| Collegedale | 4 | 11,715 | 11,117 | 1.03% | 939 | 12.48 | City |
| Middle Valley | 5 | 11,353 | 12,100 | -0.78% | 1,163 | 9.76 | CDP |
| Signal Mountain | 6 | 8,954 | 8,858 | 0.21% | 1,070 | 8.37 | Town |
| Harrison | 7 | 8,449 | 8,485 | 0.53% | 1,253 | 6.74 | CDP |
| Apison | 8 | 4,632 | 4,220 | 3.23% | 286 | 16.18 | CDP |
| Sale Creek | 9 | 3,120 | 2,899 | 0.58% | 104 | 30.14 | CDP |
| Falling Water | 10 | 2,220 | 1,534 | 3.06% | 443 | 5.01 | CDP |
| Lookout Mountain | 11 | 2,049 | 2,059 | -0.1% | 1,526 | 1.34 | Town |
| Lakesite | 12 | 1,986 | 1,865 | 1.22% | 1,141 | 1.74 | City |
| Walden | 13 | 1,975 | 1,984 | -0.1% | 559 | 3.53 | Town |
| Lone Oak | 14 | 1,678 | 1,265 | 1.88% | 259 | 6.47 | CDP |
| Fairmount | 15 | 1,478 | 1,467 | -5.68% | 353 | 4.19 | CDP |
| Ridgeside | 16 | 447 | 447 | 0% | 2,645 | 0.17 | City |
| Ooltewah | 17 | 406 | 744 | -4.25% | 657 | 0.62 | CDP |
Chattanooga is the largest city in Hamilton County, with a population of 190,671.
Ooltewah is the smallest city in Hamilton County.
There are 17 cities in Hamilton County, Tennessee.