9 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Spearfish | 1 | 13,988 | 12,222 | 2.59% | 812 | 17.24 | City |
| Lead | 2 | 3,071 | 2,980 | 0.59% | 1,492 | 2.06 | City |
| Deadwood | 3 | 1,469 | 1,153 | 4.48% | 298 | 4.93 | City |
| Whitewood | 4 | 979 | 888 | 1.87% | 1,537 | 0.64 | City |
| Boulder Canyon | 5 | 706 | 411 | 7.13% | 231 | 3.06 | CDP |
| Blucksberg Mountain | 6 | 658 | 440 | 2.02% | 984 | 0.67 | CDP |
| St. Onge township | 7 | 378 | 327 | 3% | 11 | 35.77 | Township |
| Central City | 8 | 108 | 98 | 1.89% | 730 | 0.15 | City |
| Whitewood township | 9 | 94 | 88 | 1.08% | 2 | 49.49 | Township |
Spearfish is the largest city in Lawrence County, with a population of 13,988.
Whitewood township is the smallest city in Lawrence County.
There are 9 cities in Lawrence County, South Dakota.