Boulder County
URL: https://knowledge.ivjn.us/en/places/co-boulder-county.html

Boulder County is a county in Colorado, United States, with county seat Boulder.

## Administrative divisions

Boulder County is a county in Colorado, United States; the county seat is Boulder[^uscb2023].

## Basic facts

- State: [Colorado](https://knowledge.ivjn.us/en/places/colorado.html)
- County seat: Boulder[^uscb2023]
- Division level: county[^uscb2023]

## Parent division

Located in [Colorado](https://knowledge.ivjn.us/en/places/colorado.html).

Updated: 2026-10-29

Relations:
- Located in: Colorado https://knowledge.ivjn.us/en/places/colorado.html
- Contains places: Boulder https://knowledge.ivjn.us/en/places/co-boulder.html
- Contains places: Bonanza Mountain Estates https://knowledge.ivjn.us/en/places/co-bonanza-mountain-estates.html
- Contains places: Coal Creek https://knowledge.ivjn.us/en/places/co-coal-creek.html
- Contains places: Eldorado Springs https://knowledge.ivjn.us/en/places/co-eldorado-springs.html
- Contains places: Eldora https://knowledge.ivjn.us/en/places/co-eldora.html
- Contains places: Lafayette https://knowledge.ivjn.us/en/places/co-lafayette.html
- Contains places: Louisville https://knowledge.ivjn.us/en/places/co-louisville.html
- Contains places: Nederland https://knowledge.ivjn.us/en/places/co-nederland.html
- Contains places: Paragon Estates https://knowledge.ivjn.us/en/places/co-paragon-estates.html
- Contains places: Saint Anton Highlands https://knowledge.ivjn.us/en/places/co-saint-anton-highlands.html

Mentioned in:
- Colorado https://knowledge.ivjn.us/en/places/colorado.html
- Allenspark https://knowledge.ivjn.us/en/places/co-allenspark.html
- Altona https://knowledge.ivjn.us/en/places/co-altona.html
- Bark Ranch https://knowledge.ivjn.us/en/places/co-bark-ranch.html
- Bonanza Mountain Estates https://knowledge.ivjn.us/en/places/co-bonanza-mountain-estates.html
- Coal Creek https://knowledge.ivjn.us/en/places/co-coal-creek.html
- Crisman https://knowledge.ivjn.us/en/places/co-crisman.html
- Eldora https://knowledge.ivjn.us/en/places/co-eldora.html
- Eldorado Springs https://knowledge.ivjn.us/en/places/co-eldorado-springs.html
- Erie https://knowledge.ivjn.us/en/places/co-erie.html

Sources:
- Boulder County (Wikipedia) https://en.wikipedia.org/wiki/Boulder_County
- U.S. Census Bureau 2023 FIPS state and county codes https://www.census.gov/library/reference/code-lists/ansi.html