51 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Warren | 1 | 38,477 | 39,161 | -0.35% | 2,411 | 15.96 | City |
| Weathersfield township | 2 | 24,342 | 24,597 | -0.18% | 1,112 | 21.89 | Township |
| Liberty township | 3 | 21,272 | 21,506 | -0.18% | 939 | 22.66 | Township |
| Howland township | 4 | 18,891 | 19,034 | -0.11% | 1,072 | 17.63 | Township |
| Niles | 5 | 18,146 | 18,420 | -0.3% | 2,110 | 8.60 | City |
| Hubbard township | 6 | 12,823 | 12,935 | -0.13% | 527 | 24.32 | Township |
| Girard | 7 | 9,398 | 9,575 | -0.37% | 1,666 | 5.64 | City |
| Champion township | 8 | 9,300 | 9,379 | -0.12% | 358 | 25.96 | Township |
| Newton township | 9 | 8,536 | 8,606 | -0.12% | 351 | 24.31 | Township |
| Brookfield township | 10 | 8,390 | 8,431 | -0.05% | 343 | 24.48 | Township |
| Hubbard | 11 | 7,534 | 7,619 | -0.23% | 1,870 | 4.03 | City |
| Cortland | 12 | 7,039 | 7,096 | -0.16% | 1,626 | 4.33 | City |
| Howland Center | 13 | 6,245 | 6,417 | -0.11% | 1,542 | 4.05 | CDP |
| Bazetta township | 14 | 5,869 | 5,902 | -0.09% | 281 | 20.91 | Township |
| Warren township | 15 | 5,525 | 5,744 | -0.83% | 158 | 34.89 | Township |
| Warren township | 16 | 4,674 | 4,692 | -0.02% | 322 | 14.53 | Township |
| Newton Falls | 17 | 4,512 | 4,566 | -0.24% | 1,527 | 2.96 | Village |
| Vienna township | 18 | 4,049 | 4,059 | 0% | 173 | 23.42 | Township |
| Mineral Ridge | 19 | 3,971 | 4,130 | 0.13% | 1,115 | 3.56 | CDP |
| Warren township | 20 | 3,820 | 3,937 | -0.57% | 102 | 37.48 | Township |
| Southington township | 21 | 3,722 | 3,728 | 0.03% | 140 | 26.52 | Township |
| Warren township | 22 | 3,683 | 3,831 | -0.73% | 160 | 23.07 | Township |
| Mesopotamia township | 23 | 3,385 | 3,414 | -0.15% | 127 | 26.64 | Township |
| Farmington township | 24 | 2,941 | 2,966 | -0.1% | 108 | 27.24 | Township |
| Bristol township | 25 | 2,686 | 2,701 | -0.07% | 103 | 26.03 | Township |
| Braceville township | 26 | 2,446 | 2,458 | -0.04% | 105 | 23.22 | Township |
| Fowler township | 27 | 2,343 | 2,352 | -0.04% | 92 | 25.59 | Township |
| Mecca township | 28 | 2,311 | 2,322 | -0.04% | 114 | 20.31 | Township |
| Masury | 29 | 2,249 | 2,088 | 0.54% | 650 | 3.46 | CDP |
| West Hill | 30 | 2,222 | 2,031 | -0.13% | 1,500 | 1.48 | CDP |
| Churchill | 31 | 2,106 | 1,995 | -0.14% | 837 | 2.52 | CDP |
| Bolindale | 32 | 1,988 | 2,258 | -0.3% | 2,022 | 0.98 | CDP |
| North Bloomfield township | 33 | 1,855 | 1,838 | 0.32% | 63 | 29.66 | Township |
| Hartford township | 34 | 1,839 | 1,855 | -0.11% | 69 | 26.50 | Township |
| Johnston township | 35 | 1,736 | 1,735 | 0.12% | 70 | 24.96 | Township |
| Kinsman township | 36 | 1,711 | 1,726 | -0.12% | 66 | 26.04 | Township |
| Hartford township | 37 | 1,467 | 1,433 | 0.27% | 53 | 27.59 | Township |
| Morgandale | 38 | 1,395 | 887 | 0.79% | 526 | 2.65 | CDP |
| Vernon township | 39 | 1,347 | 1,344 | 0.15% | 57 | 23.68 | Township |
| Brookfield Center | 40 | 1,267 | 1,375 | 0.32% | 434 | 2.92 | CDP |
| Bloomfield township | 41 | 1,230 | 1,243 | -0.16% | 48 | 25.47 | Township |
| Warren township | 42 | 1,062 | 1,087 | -0.19% | 49 | 21.78 | Township |
| Greene township | 43 | 946 | 948 | 0.11% | 40 | 23.91 | Township |
| McKinley Heights | 44 | 908 | 745 | -1.09% | 1,002 | 0.91 | CDP |
| Leavittsburg | 45 | 902 | 1,468 | -7.3% | 608 | 1.48 | CDP |
| Gustavus township | 46 | 820 | 827 | -0.12% | 33 | 24.90 | Township |
| Vienna Center | 47 | 651 | 508 | 0% | 680 | 0.96 | CDP |
| West Farmington | 48 | 528 | 538 | -0.38% | 585 | 0.90 | Village |
| Orangeville | 49 | 167 | 174 | -0.6% | 224 | 0.74 | Village |
| Brookfield township | 50 | 107 | 101 | 0.94% | 4 | 29.76 | Township |
| Yankee Lake | 51 | 73 | 75 | 0% | 130 | 0.56 | Village |
Warren is the largest city in Trumbull County, with a population of 38,477.
Yankee Lake is the smallest city in Trumbull County.
There are 51 cities in Trumbull County, Ohio.