16 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Las Vegas | 1 | 12,596 | 13,210 | -0.9% | 1,461 | 9 | City |
| Las Vegas | 2 | 12,596 | 13,171 | -0.9% | 1,461 | 9 | City |
| Pecos | 3 | 1,368 | 1,389 | -0.29% | 771 | 2 | Village |
| Pecos | 4 | 1,368 | 1,386 | -0.29% | 771 | 2 | Village |
| San Jose | 5 | 882 | 750 | 1.38% | 488 | 2 | CDP |
| La Cueva | 6 | 868 | 463 | 7.16% | 113 | 8 | CDP |
| Rowe | 7 | 624 | 513 | 2.3% | 102 | 6 | CDP |
| Villanueva | 8 | 484 | 339 | 3.64% | 67 | 7 | CDP |
| Ribera | 9 | 308 | 501 | -2.53% | 122 | 3 | CDP |
| Soham | 10 | 250 | 132 | 1.21% | 162 | 2 | CDP |
| East Pecos | 11 | 241 | 545 | -12.36% | 67 | 4 | CDP |
| North San Ysidro | 12 | 228 | 47 | 2.24% | 99 | 2 | CDP |
| Sena | 13 | 165 | 187 | 1.23% | 78 | 2 | CDP |
| Conchas Dam | 14 | 137 | 120 | -2.14% | 16 | 8 | CDP |
| Valencia | 15 | 108 | 161 | 8% | 70 | 2 | CDP |
| San Jose | 16 | 102 | 98 | -1.92% | 385 | 0 | CDP |
Las Vegas is the largest city in San Miguel County, with a population of 12,596.
San Jose is the smallest city in San Miguel County, with a population of 102.
There are 16 cities in San Miguel County, New Mexico.