29 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Center | 1 | 1,767 | 1,774 | 0% | 49 | 36 | Township |
| Smith Center | 2 | 1,566 | 1,574 | -0.06% | 1,274 | 1 | City |
| Cedar | 3 | 553 | 567 | -0.54% | 15 | 36 | Township |
| Cedar | 4 | 472 | 475 | 0% | 13 | 36 | Township |
| Kensington | 5 | 394 | 399 | -0.25% | 1,176 | 0 | City |
| Oak | 6 | 230 | 237 | -0.86% | 6 | 36 | Township |
| Lebanon | 7 | 180 | 182 | 0% | 559 | 0 | City |
| Houston | 8 | 130 | 131 | 0% | 4 | 36 | Township |
| Gaylord | 9 | 83 | 85 | 0% | 325 | 0 | City |
| Harvey | 10 | 74 | 76 | 0% | 2 | 36 | Township |
| Harlan | 11 | 72 | 72 | 0% | 2 | 36 | Township |
| Valley | 12 | 69 | 65 | 2.99% | 2 | 36 | Township |
| Cedar | 13 | 66 | 70 | -1.49% | 1 | 55 | Township |
| Banner | 14 | 62 | 62 | 0% | 2 | 36 | Township |
| Beaver | 15 | 54 | 54 | 0% | 2 | 36 | Township |
| Webster | 16 | 44 | 44 | 0% | 1 | 36 | Township |
| Athol | 17 | 41 | 41 | 0% | 222 | 0 | City |
| Pleasant | 18 | 36 | 36 | 0% | 1 | 36 | Township |
| Swan | 19 | 36 | 36 | 0% | 1 | 36 | Township |
| Dor | 20 | 32 | 32 | 0% | 1 | 36 | Township |
| White Rock | 21 | 31 | 31 | 0% | 1 | 36 | Township |
| German | 22 | 29 | 29 | 0% | 1 | 35 | Township |
| Cora | 23 | 28 | 28 | 0% | 1 | 36 | Township |
| Blaine | 24 | 27 | 27 | 0% | 1 | 36 | Township |
| Crystal Plains | 25 | 27 | 27 | 0% | 1 | 36 | Township |
| Pawnee | 26 | 27 | 27 | 0% | 1 | 36 | Township |
| Cedar | 27 | 23 | 24 | 0% | 0.00 | 46 | Township |
| Martin | 28 | 21 | 21 | 0% | 1 | 36 | Township |
| Cedar | 29 | 13 | 13 | 0% | 73 | 0 | City |
Center is the largest city in Smith County, with a population of 1,767.
Cedar is the smallest city in Smith County, with a population of 13.
There are 29 cities in Smith County, Kansas.