The largest county in Arkansas
There are two right answers. By land area it is Union County; by population it is Pulaski County. Which one you want depends on what you meant by largest.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.
By land area
| Rank | Name | Land area | Population |
|---|---|---|---|
| 1 | Union County | 1,039 sq mi | 36,926 |
| 2 | White County | 1,034 sq mi | 80,085 |
| 3 | Arkansas County | 992.1 sq mi | 15,836 |
| 4 | Washington County | 941.5 sq mi | 271,213 |
| 5 | Yell County | 930.4 sq mi | 19,956 |
| 6 | Ashley County | 925.5 sq mi | 17,831 |
| 7 | Mississippi County | 902.1 sq mi | 37,828 |
| 8 | Scott County | 892.9 sq mi | 9,965 |
| 9 | Jefferson County | 872.3 sq mi | 62,987 |
| 10 | Clark County | 866 sq mi | 20,938 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Pulaski County | 404,611 | 534 per sq mi |
| 2 | Benton County | 332,554 | 392 per sq mi |
| 3 | Washington County | 271,213 | 288 per sq mi |
| 4 | Faulkner County | 133,979 | 207 per sq mi |
| 5 | Saline County | 133,288 | 184 per sq mi |
| 6 | Sebastian County | 130,641 | 246 per sq mi |
| 7 | Craighead County | 116,957 | 165 per sq mi |
| 8 | Garland County | 99,695 | 147 per sq mi |
| 9 | White County | 80,085 | 77.5 per sq mi |
| 10 | Lonoke County | 76,664 | 99.3 per sq mi |
And the smallest
More on Arkansas
Rebuilt from source data 30 August 2026. How these figures are produced.