| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gulfport | 1 | 77,003 | 72,893 | 0.65% | 1,384 | 56 | City |
| Biloxi | 2 | 48,265 | 49,412 | -0.52% | 1,124 | 43 | City |
| Long Beach | 3 | 17,428 | 16,804 | 0.69% | 1,701 | 10 | City |
| D'Iberville | 4 | 13,743 | 12,720 | 1.37% | 1,301 | 11 | City |
| Pass Christian | 5 | 6,634 | 5,749 | 2.71% | 805 | 8 | City |
Gulfport is the largest city in Harrison County, with a population of 77,003.
Pass Christian is the smallest city in Harrison County, with a population of 6,634.
There are 5 cities in Harrison County, Mississippi.