Mountrail County

Also known as Mountrail County, North Dakota, Mountrail County, ND

county in North Dakota, United States

Key facts

Country: United States
State: North Dakota
Founded: January 4, 1873 (created), November 8, 1892 (eliminated), January 16, 1909 (re-created), January 29, 1909 (organized)
Seat: Stanley
Largest city: New Town
Total: 1,941.419 sq mi (5,028.25 km )
Land: 1,825.163 sq mi (4,727.15 km )
Water: 116.256 sq mi (301.10 km ) 5.99%
Estimate 2025: 9,395
Density: 5.19/sq mi (2.00/km )
Time zone: UTC−6 ( Central )
Summer dst: UTC−5 ( CDT )

Article

Mountrail County is a county in the northwestern part of North Dakota, United States. As of the 2020 census, the population was 9,809, and was estimated to be 9,395 in 2025. The county seat is Stanley and the largest city is New Town.

The county was originally created in 1873, then removed in 1892, and annexed by Ward County. It was re-created and organized in 1909.