Turtle Mountain Reservation and Off-Reservation Trust Land
Turtle Mountain Reservation and Off-Reservation Trust Land is a federal reservation with off-reservation trust land in Rolette County and Williams County, North Dakota; and Phillips County, Blaine County, Sheridan County, and Roosevelt County, Montana, as the Census Bureau maps it. About 7,447 people live there (2020–2024 estimate). It covers 230 sq mi (595 km²) of land.
- Population, 2020–2024 estimate
- 7,447 ± 327
- What it is
- Federal reservation · Off-reservation trust land
- Counties
- Rolette County, ND55% of its landPhillips County, MT12% of its landBlaine County, MT9% of its landSheridan County, MT9% of its landWilliams County, ND5% of its landRoosevelt County, MT4% of its land
- Land area
- 230 sq mi (595 km²)
- Median household income
- $58,906 ± $14,975
- Median home value
- $89,400 ± $13,201
- Water area
- 10.2 sq mi (26.3 km²)
- States
- North Dakota, Montana
- Census code
- 4345
- Coordinates (central point)
- 48.818420, -99.805819
These coordinates mark a central point for the area, not an address. Population, income and home value: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 20, 2026.
Communities in this area, largest first
- Belcourt (CDP)1,547 people
- Shell Valley (CDP)1,243 people
- Green Acres (CDP)994 people
- East Dunseith (CDP)450 people
These places’ central points lie inside the area. People counts are American Community Survey 2020–2024 5-year estimates.
Before using this answer
These Census boundaries don’t decide tribal membership, jurisdiction or land status, and they aren’t a land acknowledgment. For services, enrollment or jurisdiction, ask the tribal government.