Sheridan County, Montana
Sheridan County, Montana, has 3,436 residents (July 2025 estimate). Its county seat is Plentywood. It uses Mountain Time and covers 1,677 sq mi (4,343 km²) of land.
- Resident population, July 2025
- 3,436
- Land area
- 1,677 sq mi (4,343 km²)
- County seat or government
- Plentywood
- Time zone
- Mountain TimeUTC-07:00 in January; UTC-06:00 in July
- Median household income
- $70,147 ± $15,093
- Median home value
- $124,000 ± $20,717
- Median rent, with utilities
- $746 ± $60
- Homes lived in by their owners
- 71.8% ± 4.9 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Williston, ND micro area
- Water area
- 29 sq mi (75.1 km²)
- State
- Montana
- County code (FIPS)
- 30091
- Coordinates (central point)
- 48.705587, -104.533916
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Sheridan County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Mountain TimeAmerica/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 592541,822 people
- 59226644 people
- 59275436 people
- 59247310 people
- 59211298 people
- 59256258 people
- 59258184 people
- 59219144 people
- 59257132 people
- 5925270 people
- 5924255 people
11 ZIP Code areas overlap Sheridan County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Sheridan County, largest first
- Plentywood K-12 Schools2,564 people
- Medicine Lake K-12 Schools656 people
- Westby K-12 Schools449 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Tribal areas in Sheridan County, largest first
- Fort Peck Indian Reservation and Off-Reservation Trust Land9,785 people
- Turtle Mountain Reservation and Off-Reservation Trust Land7,447 people
American Indian, Alaska Native and Native Hawaiian areas as the Census Bureau maps them, with at least 2% of their area here, water included. These lines don’t decide membership, jurisdiction or land status.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Plentywood, Montana (city)1,654 people
- Westby, Montana (town)290 people
- Medicine Lake, Montana (town)213 people
- Outlook, Montana (town)51 people
- Homestead, Montana (CDP)27 people
- Reserve, Montana (CDP)19 people
- Redstone, Montana (CDP)4 people
- Antelope, Montana (CDP)0 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Roosevelt County, Montana36 mi southwest
- Daniels County, Montana46 mi west
- Divide County, North Dakota47 mi east
- Williams County, North Dakota53 mi southeast
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.
Areas that only touch the edge
These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.