The largest county in North Dakota
There are two right answers. By land area it is McKenzie County; by population it is Cass 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 | McKenzie County | 2,760 sq mi | 15,192 |
| 2 | Stutsman County | 2,222 sq mi | 21,414 |
| 3 | McLean County | 2,110 sq mi | 9,740 |
| 4 | Williams County | 2,078 sq mi | 41,767 |
| 5 | Ward County | 2,013 sq mi | 68,233 |
| 6 | Dunn County | 2,008 sq mi | 4,058 |
| 7 | Morton County | 1,926 sq mi | 34,601 |
| 8 | McHenry County | 1,874 sq mi | 5,130 |
| 9 | Mountrail County | 1,825 sq mi | 9,395 |
| 10 | Cass County | 1,765 sq mi | 201,794 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Cass County | 201,794 | 114 per sq mi |
| 2 | Burleigh County | 103,251 | 63.2 per sq mi |
| 3 | Grand Forks County | 74,501 | 51.9 per sq mi |
| 4 | Ward County | 68,233 | 33.9 per sq mi |
| 5 | Williams County | 41,767 | 20.1 per sq mi |
| 6 | Morton County | 34,601 | 18.0 per sq mi |
| 7 | Stark County | 34,013 | 25.5 per sq mi |
| 8 | Stutsman County | 21,414 | 9.6 per sq mi |
| 9 | Richland County | 16,731 | 11.7 per sq mi |
| 10 | McKenzie County | 15,192 | 5.5 per sq mi |
And the smallest
More on North Dakota
Rebuilt from source data 30 August 2026. How these figures are produced.