7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lumberton | 1 | 14,412 | 13,624 | 1.1% | 1,075 | 13 | City |
| Silsbee | 2 | 6,654 | 6,938 | -0.85% | 866 | 8 | City |
| Kountze | 3 | 2,166 | 1,960 | 1.93% | 544 | 4 | City |
| Sour Lake | 4 | 1,862 | 1,777 | 0.92% | 809 | 2 | City |
| Pinewood Estates | 5 | 1,497 | 1,200 | -0.8% | 114 | 13 | CDP |
| Wildwood | 6 | 685 | 968 | -5.12% | 157 | 4 | CDP |
| Rose Hill Acres | 7 | 334 | 324 | 0.6% | 861 | 0 | City |
Lumberton is the largest city in Hardin County, with a population of 14,412.
Rose Hill Acres is the smallest city in Hardin County, with a population of 334.
There are 7 cities in Hardin County, Texas.