Princeville is a planned resort community on the north shore of the island of Kauai, and is home to the Princeville Resort. The area was named in honor of an 1860 visit by Prince Albert Kamehameha (son of King Kamehameha IV and Queen Emma) . It was then a sugar plantation owned by Robert Crichton Wyllie. Later it became a cattle ranch. It was sold for development in 1968.
According to the United States Census Bureau, the CDP has a total area of 2.4 square miles (6.2 km²), of which, 2.1 square miles (5.4 km²) of it is land and 0.3 square miles (0.7 km²) of it (11.76%) is water.
There were 752 households out of which 23.4% had children under the age of 18 living with them, 53.5% were married couples living together, 9.2% had a female householder with no husband present, and 34.7% were non-families. 26.1% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 2.26 and the average family size was 2.70.
In the CDP the population was spread out with 19.3% under the age of 18, 3.4% from 18 to 24, 25.3% from 25 to 44, 35.6% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 46 years. For every 100 females there were 100.7 males. For every 100 females age 18 and over, there were 100.3 males.
The median income for a household in the CDP was $63,833, and the median income for a family was $67,266. Males had a median income of $48,229 versus $29,542 for females. The per capita income for the CDP was $37,971. About 7.4% of families and 8.1% of the population were below the poverty line, including 11.5% of those under age 18 and 4.3% of those age 65 or over.