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Where am ILOCATED

Custer County, Idaho

Custer County, Idaho, has 4,636 residents (July 2025 estimate). Its county seat is Challis. It uses Mountain Time and covers 4,922 sq mi (12,748 km²) of land.

Boise CityMeridian
Custer County in Idaho
Boise CountyButte CountyValley CountyChallisMackayStanleyLost RiverClayton
Custer County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
4,636
Land area
4,922 sq mi (12,748 km²)
County seat or government
Challis
Time zone
Mountain TimeUTC-07:00 in January; UTC-06:00 in July
Median household income
$67,574 ± $16,035
Median home value
$381,700 ± $70,646
Median rent, with utilities
$691 ± $138
Homes lived in by their owners
76.8% ± 6.6 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Hailey, ID micro area, Mountain Home, ID micro area, Boise City, ID metro area, and Idaho Falls, ID metro area
Water area
16.4 sq mi (42.5 km²)
State
Idaho
County code (FIPS)
16037
Coordinates (central point)
44.273351, -114.252267
Open this point in the location finder

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 Custer County

Time zoneLocal time and UTC offsetNext clock change
Mountain TimeAmerica/BoiseUTC-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

  1. 832262,100 people
  2. 832511,443 people
  3. 832551,222 people
  4. 83278454 people
  5. 83227200 people
  6. 83253112 people
  7. 832351 people

7 ZIP Code areas overlap Custer 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 Custer County, largest first

  1. Challis Joint School District 1812,867 people
  2. Butte County Joint School District 1112,596 people
  3. Mackay Joint School District 1821,804 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.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Challis, Idaho (city)854 people
  2. Mackay, Idaho (city)602 people
  3. Stanley, Idaho (city)319 people
  4. Lost River, Idaho (city)55 people
  5. Clayton, Idaho (city)0 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Lemhi County, Idaho49 mi north
  2. Blaine County, Idaho63 mi south
  3. Butte County, Idaho67 mi southeast
  4. Boise County, Idaho75 mi west
  5. Valley County, Idaho78 mi northwest
  6. Elmore County, Idaho86 mi southwest

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.

See this county on Census.gov ↗

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.