COUNTY · ME
Aroostook County, Maine
Aroostook County is a county in Maine with FIPS code 23003 and an estimated population of 67,351 (Census 2023), 6th largest of 16 in the state.
County facts
- Name
- Aroostook County
- State
- Maine
- Type
- county
- FIPS code
- 23003
- State FIPS
- 23
- Population (2023)
- 67,351
- Change since 2020
- +0.4%
- State rank
- 6 of 16
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Aroostook County?
Aroostook County, Maine has the five-digit FIPS code 23003: 23 for the state and 003 for the county.
What state is Aroostook County in?
Aroostook County is in Maine.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.