5 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gulfport | 1 | 75,491 | 72,880 | 0.58% | 1,357 | 56 | City |
| Biloxi | 2 | 47,502 | 49,428 | -0.67% | 1,106 | 43 | City |
| Long Beach | 3 | 17,420 | 16,810 | 0.59% | 1,701 | 10 | City |
| D'Iberville | 4 | 13,740 | 12,716 | 1.26% | 1,301 | 11 | City |
| Pass Christian | 5 | 6,769 | 5,749 | 2.58% | 822 | 8 | City |
Gulfport is the largest city in Harrison County, with a population of 75,491.
Pass Christian is the smallest city in Harrison County, with a population of 6,769.
There are 5 cities in Harrison County, Mississippi.