26 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Chattanooga | 1 | 193,802 | 181,671 | 1.2% | 1,361 | 142 | City |
| Chattanooga | 2 | 193,802 | 182,271 | 1.2% | 1,361 | 142 | City |
| Soddy-Daisy | 3 | 13,524 | 13,069 | 0.7% | 584 | 23 | City |
| Soddy-Daisy | 4 | 13,524 | 13,052 | 0.7% | 584 | 23 | City |
| Red Bank | 5 | 12,109 | 11,899 | 0.3% | 1,846 | 7 | City |
| Red Bank | 6 | 12,109 | 11,926 | 0.3% | 1,846 | 7 | City |
| Collegedale | 7 | 11,607 | 11,102 | 0.84% | 930 | 12 | City |
| Collegedale | 8 | 11,607 | 11,122 | 0.84% | 930 | 12 | City |
| Middle Valley | 9 | 11,353 | 12,100 | -0.78% | 1,163 | 10 | CDP |
| Signal Mountain | 10 | 8,882 | 8,848 | 0.06% | 1,061 | 8 | Town |
| Signal Mountain | 11 | 8,882 | 8,854 | 0.06% | 1,061 | 8 | Town |
| Harrison | 12 | 8,449 | 8,485 | 0.54% | 1,253 | 7 | CDP |
| Apison | 13 | 4,632 | 4,220 | 3.23% | 286 | 16 | CDP |
| Sale Creek | 14 | 3,120 | 2,899 | 0.58% | 104 | 30 | CDP |
| Falling Water | 15 | 2,220 | 1,534 | 3.06% | 443 | 5 | CDP |
| Lookout Mountain | 16 | 2,030 | 2,067 | -0.39% | 1,512 | 1 | Town |
| Lookout Mountain | 17 | 2,030 | 2,068 | -0.39% | 1,512 | 1 | Town |
| Walden | 18 | 1,971 | 1,980 | -0.15% | 558 | 4 | Town |
| Walden | 19 | 1,971 | 1,984 | -0.15% | 558 | 4 | Town |
| Lakesite | 20 | 1,970 | 1,856 | 1.08% | 1,132 | 2 | City |
| Lakesite | 21 | 1,970 | 1,865 | 1.08% | 1,132 | 2 | City |
| Lone Oak | 22 | 1,678 | 1,265 | 1.88% | 259 | 6 | CDP |
| Fairmount | 23 | 1,478 | 1,467 | -5.68% | 353 | 4 | CDP |
| Ridgeside | 24 | 443 | 447 | -0.23% | 2,621 | 0 | City |
| Ridgeside | 25 | 443 | 447 | -0.23% | 2,621 | 0 | City |
| Ooltewah | 26 | 406 | 744 | -4.25% | 657 | 1 | CDP |
Chattanooga is the largest city in Hamilton County, with a population of 193,802.
Ooltewah is the smallest city in Hamilton County, with a population of 406.
There are 26 cities in Hamilton County, Tennessee.