Yellowstone County, Montana
Yellowstone County is a county in Montana. Its county FIPS code is 30111. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 30111
- Representative coordinates
- 45.936987, -108.276656
- County type
- County
- County seat or government
- Billings
- Resident population, July 2025
- 172,692
- Land area
- 6,820.478 km²
- Water area
- 40.49 km²
- State
- Montana
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Yellowstone County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Denver | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
59002 · 59006 · 59015 · 59024 · 59037 · 59041 · 59044 · 59057 · 59063 · 59064 · 59079 · 59088 · 59101 · 59102 · 59105 · 59106
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Yellowstone County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
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Find the county at your current point, check its ZIP area, or find its physical time zone.