The largest county in Kentucky
There are two right answers. By land area it is Pike County; by population it is Jefferson 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 | Pike County | 786.2 sq mi | 54,721 |
| 2 | Christian County | 717.8 sq mi | 70,115 |
| 3 | Pulaski County | 658.1 sq mi | 67,384 |
| 4 | Hardin County | 623.9 sq mi | 113,482 |
| 5 | Ohio County | 587.1 sq mi | 23,934 |
| 6 | Breckinridge County | 569.7 sq mi | 21,503 |
| 7 | Logan County | 552.2 sq mi | 28,669 |
| 8 | Graves County | 551.8 sq mi | 37,050 |
| 9 | Hopkins County | 542.3 sq mi | 45,127 |
| 10 | Warren County | 541.7 sq mi | 149,375 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Jefferson County | 795,222 | 2,088 per sq mi |
| 2 | Fayette County | 329,751 | 1,162 per sq mi |
| 3 | Kenton County | 175,779 | 1,096 per sq mi |
| 4 | Warren County | 149,375 | 276 per sq mi |
| 5 | Boone County | 145,316 | 590 per sq mi |
| 6 | Hardin County | 113,482 | 182 per sq mi |
| 7 | Daviess County | 104,898 | 229 per sq mi |
| 8 | Madison County | 101,696 | 232 per sq mi |
| 9 | Campbell County | 95,441 | 631 per sq mi |
| 10 | Bullitt County | 86,454 | 291 per sq mi |
And the smallest
More on Kentucky
Rebuilt from source data 30 August 2026. How these figures are produced.