Kailua
- County:
- Honolulu County
- County Seat:
- No
- Area (mi²):
- 7.772
- State:
- Hawaii
Kailua is a CDP located in Honolulu County, Hawaii. Kailua has a 2026 population of 36,513. Kailua is currently declining at a rate of -0.83% annually and its population has decreased by since the most recent census, which recorded a population of 0 in 2020.