COUNTY · NH
Rockingham County, New Hampshire
Rockingham County is a county in New Hampshire with FIPS code 33015 and an estimated population of 320,689 (Census 2023), 2nd largest of 10 in the state.
County facts
- Name
- Rockingham County
- State
- New Hampshire
- Type
- county
- FIPS code
- 33015
- State FIPS
- 33
- Population (2023)
- 320,689
- Change since 2020
- +1.9%
- State rank
- 2 of 10
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Rockingham County?
Rockingham County, New Hampshire has the five-digit FIPS code 33015: 33 for the state and 015 for the county.
What state is Rockingham County in?
Rockingham County is in New Hampshire.
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.