According to theU.S. Census Bureau, the county has a total area of 1,266 square miles (3,280 km2), of which 620 square miles (1,600 km2) is land and 646 square miles (1,670 km2) (51.0%) is water.[3] ThePacific Ocean surrounds the county.
There are no incorporated communities in Kauai County, or in any other county of Hawaii. The county is the only form of local government in theState of Hawaii.
As of the2020 census, the county had a population of 73,298. Of the residents, 21.5% were under the age of 18 and 21.2% were 65 years of age or older; the median age was 43.0 years. For every 100 females there were 97.5 males, and for every 100 females age 18 and over there were 96.2 males. 57.8% of residents lived in urban areas and 42.2% lived in rural areas.[9]
There were 24,712 households in the county, of which 33.8% had children under the age of 18 living with them and 24.5% had a female householder with no spouse or partner present. About 21.6% of all households were made up of individuals and 11.1% had someone living alone who was 65 years of age or older.[11]
There were 30,157 housing units, of which 18.1% were vacant. Among occupied housing units, 62.8% were owner-occupied and 37.2% were renter-occupied. The homeowner vacancy rate was 1.1% and the rental vacancy rate was 13.4%.[11]
Kauai County, Hawaii – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
At the2000 census there were 58,463 people, 20,183 households, and 14,572 families in the county. The population density was 94 people per square mile (36 people/km2). There were 25,331 housing units at an average density of 41 per square mile (16/km2). Theracial makeup of the county was 36.0% Asian, 29.5% White, 23.8% from two or more races, 9.1% Pacific Islander, 0.3% Black or African American, 0.4% Native American and 0.9% from other races. 8.2%.[21] were Hispanic or Latino of any race.
Of the 20,183 households 34.0% had children under the age of 18 living with them, 53.9% were married couples living together, 12.8% had a female householder with no husband present, and 27.8% were non-families. 21.4% of households were one person and 7.7% were one person aged 65 or older. The average household size was 2.87 and the average family size was 3.34.
The age distribution was 26.4% under the age of 18, 7.1% from 18 to 24, 27.2% from 25 to 44, 25.5% from 45 to 64, and 13.8% 65 or older. The median age was 38 years. For every 100 females there were 100.10 males. For every 100 females age 18 and over, there were 97.50 males.
Public schools in the county are operated by theHawaiʻi State Department of Education,[23] and the county is represented by Maggie Cox on the state's Board of Education. There are 10 elementary schools, 3 middle schools, 3 high schools, and 5 K-12 schools in the county.
There are four private schools in the county:Island School, Kahili Adventist School, St. Theresa's Elementary School, and ʻŌlelo Christian Academy. St. Catherine's School used to operate, but closed its doors on June 7, 2024.[24]
Kauaʻi County operates under amayor-council form of municipal government. TheMayor of Kauaʻi, elected by the voters on a nonpartisan basis, holds executive authority for a four-year term. Meanwhile, legislative authority is vested in the seven-member County Council. Members of the County Council are elected on a nonpartisan, at-large basis to two-year terms.
Kauai County, like Hawaii in general, has traditionally been a stronghold of theDemocratic Party. The county has not voted for aRepublican presidential candidate since1984, when it narrowly voted in favor ofRonald Reagan. In2024, while it still voted majority Democratic, Kauai County cast the highest percentage for the Republican candidate of any county in the state, a distinction that has generally been held by Honolulu County; this was the first time Kauai County had done so since 1960.[29] The island of Kauai leans Democratic overall. The island of Ni'ihau, which has a very small population, tends to vote almost entirely Republican, by far the strongest such leaning of all major Hawaiian islands.[30]