View across Kailua Beach to the offshore islands
known as Na Mokulua off Lanikai
The U.S. postal code for Kailua is 96734.
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Kailua is located at 21°23'51" North, 157°44'22" West (21.397370, -157.739515)1. Nearby towns include Kāne'ohe, Maunawili, and Waimanalo.
According to the United States Census Bureau, the town has a total area of 24.7 km² (9.5 mi²) with 17.2 km² (6.6 mi²) of land and 7.5 km² (2.9 mi²) of water. Thus, total area is 30% water. A significant portion of this water area is Kawai Nui Marsh, the largest wetland in the Hawaiian Islands and a nominated Ramsar Convention site.
As of the 2000 Census, there were 36,513 people, 12,229 households, and 9,318 families residing in the town. The population density was 2,123.2/km² (5,495.8/mi²). There were 12,780 housing units at an average density of 743.1/km² (1,923.6/mi²). The racial makeup of the town was 43.84% White, 0.76% African American, 0.30% Native American, 21.11% Asian, 8.07% Pacific Islander, 0.93% from other races, and 24.99% from two or more races. 6.10% of the population were Hispanic or Latino of any race.
There were 12,229 households out of which 32.1% had children under the age of 18 living with them, 59.2% were married couples living together, 12.2% had a female householder with no husband present, and 23.8% were non-families. 16.6% of all households were made up of individuals and 6.0% have someone living alone who is 65 years of age or older. The average household size was 2.98 and the average family size was 3.33.
In the town the population was spread out with 24.1% under the age of 18, 7.2% from 18 to 24, 28.6% from 25 to 44, 26.3% from 45 to 64, and 13.7% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.9 males. For every 100 females age 18 and over, there were 95.4 males.
The median income for a household in the town was $72,784, and the median income for a family was $79,118. Males had a median income of $46,789 versus $35,612 for females. The per capita income for the town was $29,299. 5.4% of the population and 3.3% of families were below the poverty line. Out of the total people living in poverty, 5.3% were under the age of 18 and 1.5% are 65 or older.