Heeia includes Haikū Valley and Heeia Kea. The population was 4,944 at the 2000 census. The area is almost entirely one of homes and apartments. Parts of Heeia lie along Kāneohe Bay, but public access is non-existent owing to private ownership of the property behind the shore.
Notable in the Heeia area are:
Heeia Kea is a community and small, undeveloped valley separated from Heeia by Heeia Marsh and Kealohi Point. Heeia Kea Small Boat Harbor, the only public pier and boat ramp on Kāneohe Bay, is found here. Several fishponds have been restored in recent years. Although fishponds were developed on most of the islands, the largest concentrations were found in Keehi Lagoon, Pearl Harbor, and Kāneohe Bay on Oahu.
The U.S. postal code for Heeia and Heeia Kea is the same as for Kāneohe: 96744.
According to the United States Census Bureau, the CDP has a total area of 2.3 square miles (5.9 km²), of which, 2.0 square miles (5.3 km²) of it is land and 0.2 square miles (0.6 km²) of it is water. The total area is 10.92% water.
There were 1,557 households out of which 28.0% had children under the age of 18 living with them, 73.2% were married couples living together, 9.9% had a female householder with no husband present, and 12.2% were non-families. 9.2% of all households were made up of individuals and 3.8% had someone living alone who was 65 years of age or older. The average household size was 3.17 and the average family size was 3.32.
In the CDP the population was spread out with 21.4% under the age of 18, 6.9% from 18 to 24, 24.4% from 25 to 44, 31.5% from 45 to 64, and 15.8% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 98.9 males. For every 100 females age 18 and over, there were 96.4 males.
The median income for a household in the CDP was $87,528, and the median income for a family was $90,435. Males had a median income of $55,179 versus $34,983 for females. The per capita income for the CDP was $33,990. 0.5% of the population and 0.0% of families were below the poverty line. Out of the total population, 0.0% of those under the age of 18 and 0.8% of those 65 and older were living below the poverty line.