CITY · HI

What county is Honolulu, HI in?

Honolulu, HI is mostly in Honolulu County. County FIPS code 15003, population 989,408 (2023 estimate).

County details

City: Honolulu, Hawaii
Primary county: Honolulu County
FIPS code: 15003
County population: 989,408

Some cities extend into more than one county. Honolulu is placed in the county that contains its center. For a specific address, use the address lookup.

Questions

What county is Honolulu in?

Honolulu, HI is mostly in Honolulu County.

What is the county seat of Honolulu County?

County seats are not part of the data on this site. Check the county’s official website.

Can a city be in two counties?

Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.

Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.