7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lumberton | 1 | 14,469 | 13,618 | 1.19% | 1,079 | 13.41 | City |
| Silsbee | 2 | 6,667 | 6,937 | -0.8% | 868 | 7.68 | City |
| Kountze | 3 | 2,242 | 1,964 | 2.56% | 564 | 3.98 | City |
| Sour Lake | 4 | 1,901 | 1,776 | 1.33% | 826 | 2.30 | City |
| Pinewood Estates | 5 | 1,497 | 1,200 | -0.8% | 114 | 13.19 | CDP |
| Wildwood | 6 | 685 | 968 | -5.12% | 157 | 4.37 | CDP |
| Rose Hill Acres | 7 | 335 | 325 | 0.6% | 863 | 0.39 | City |
Lumberton is the largest city in Hardin County, with a population of 14,469.
Rose Hill Acres is the smallest city in Hardin County.
There are 7 cities in Hardin County, Texas.