Kailua CDP (Honolulu County), HI

Kailua occupies the windward side of Oʻahu between the Koʻolau Range and Kailua Bay. It is a census-designated place governed by Honolulu County, covering 7.77 square miles of land. The mountains, bay, and broad wetland at Kawainui give the community clear physical edges. Kailua's town center serves as the Koʻolaupoko region's principal shopping and service center, while residential areas extend toward Aikahi in the north, Maunawili near the mountain side, and Waimānalo to the southeast. The Pali and Likelike highways and H-3 cross the Koʻolau, concentrating trips between this windward setting and Honolulu into a few mountain corridors.

Kawainui is central to both the landscape and Kailua's history. At roughly 830 acres, it is Hawaiʻi's largest remaining wetland and has been a Ramsar Wetland of International Importance since 2005. The marsh supports four endemic endangered Hawaiian waterbirds and also holds stormwater, traps sediment, and helps protect the water quality of Kailua Bay. Public access is largely confined to trails and viewpoints around its perimeter. On the eastern margin, Ulupō Heiau State Historic Site preserves a stone platform about 140 by 180 feet, with walls reaching 30 feet. The site is listed on both state and national historic registers. It is associated with the period around 1750, when Kailua was an important political seat. The heiau appears to have served agricultural purposes before later use connected with war. Nearby fishpond and kalo-growing landscapes show how wetland abundance supported Hawaiian settlement long before the present town. Current stewardship days continue community work at the site.

The town center concentrates grocery stores, restaurants, professional services, civic functions, and some light-industrial work away from the beachfront. That distinction matters in daily routines: Kailua is both a regional service center for windward Oʻahu and a place whose shoreline receives heavy recreational use. TheBus provides daily cross-island links. Route 66 runs between Kailua-Aikahi and downtown Honolulu's Bishop Street, and Route 67 connects Kailua and Waimānalo with Ala Moana. Within the community, those routes pass through Kailua town, tying the commercial center to surrounding residential areas and to the limited corridors through the Koʻolau Range. Bus travel, retail errands, and beach traffic converge in the same central district.

Kailua Beach Park supports canoe paddling, picnicking, swimming, and surfing, and keeping the beach usable now requires active dune restoration. After decades of erosion, work began in November 2024; sand fencing and two 2025 volunteer plantings placed about 1,800 native plants to trap windblown sand and rebuild the dune. Another water-related project affects ordinary travel in 2026. Honolulu began rehabilitating the North Kalāheo Avenue bridge over Kawainui Canal on March 30, with work scheduled through October. Repairs include the concrete structure, bridge railings, road surface, drains, guardrails, and retaining walls. Kāneʻohe-bound traffic uses a Kainui Drive detour while work occupies part of the crossing. Restoration plots line the bay while bridge construction constrains the canal crossing, making water management visible on both a beach outing and a cross-town trip.