COUNTY · NC
Onslow County, North Carolina
Onslow County is a county in North Carolina with FIPS code 37133 and an estimated population of 213,676 (Census 2023), 13th largest of 100 in the state.
County facts
- Name
- Onslow County
- State
- North Carolina
- Type
- county
- FIPS code
- 37133
- State FIPS
- 37
- Population (2023)
- 213,676
- Change since 2020
- +2.8%
- State rank
- 13 of 100
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in North Carolina
Questions
What is the FIPS code for Onslow County?
Onslow County, North Carolina has the five-digit FIPS code 37133: 37 for the state and 133 for the county.
What state is Onslow County in?
Onslow County is in North Carolina.
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.