In 2021, Kauai County, HI had a population of 73.2k people with a median age of 42.3 and a median household income of $86,287. Between 2020 and 2021 the population of Kauai County, HI grew from 71,949 to 73,247, a 1.8% increase and its median household income grew from $82,818 to $86,287, a 4.19% increase.