Diamond Ridge is a census-designated place (CDP) just outside Homer in Kenai Peninsula Borough, Alaska, United States. At the 2010 census the population was 1,156, down from 1,802 in 2000.
Diamond Ridge is located at 59°39′55″N 151°34′15″W / 59.66528°N 151.57083°W / 59.66528; -151.57083 (59.665391, -151.570826) and is bordered to the south by the city of Homer and to the southeast by the city of Kachemak. To the east is the Fritz Creek CDP, while to the north and west is the Anchor Point CDP. The farthest west part of the Diamond Ridge CDP borders Cook Inlet at the mouth of Kachemak Bay.
The community is named for the high ground, Diamond Ridge, on which it sits. The ridge reaches an elevation of 1,202 feet (366 m) above sea level and is in the southern part of the CDP. Parallel landforms to the north are Crossman Ridge in the center of the CDP and a ridge connecting 1,513-foot (461 m) Ohlson Mountain and 1,622-foot (494 m) Lookout Mountain in the north. The terrain slopes north from the ridges to the Anchor River, which forms the northern boundary of the CDP.
According to the United States Census Bureau, the Diamond Ridge CDP has a total area of 42.4 square miles (109.8 km), of which 0.004 square miles (0.01 km), or 0.01%, are water. The main access is via Diamond Ridge Road, which runs across the top of the 5-mile-long (8.0 km) ridge and connects to feeder roads on either side.
Diamond Ridge first appeared on the 2000 U.S. Census as a census-designated place (CDP).
As of the census of 2000, there were 1,802 people, 683 households, and 471 families residing in the CDP. The population density was 37.8 people per square mile (14.6/km²). There were 850 housing units at an average density of 17.8/sq mi (6.9/km²). The racial makeup of the CDP was 92.29% White, 0.11% Black or African American, 3.16% Native American, 0.44% Asian, 0.89% from other races, and 3.11% from two or more races. 2.11% of the population were Hispanic or Latino of any race.
There were 683 households out of which 38.9% had children under the age of 18 living with them, 60.0% were married couples living together, 5.7% had a female householder with no husband present, and 31.0% were non-families. 24.0% of all households were made up of individuals and 3.2% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.15.
In the CDP, the population was spread out with 29.7% under the age of 18, 5.3% from 18 to 24, 30.5% from 25 to 44, 28.6% from 45 to 64, and 5.9% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 101.6 males. For every 100 females age 18 and over, there were 104.9 males.
The median income for a household in the CDP was $50,977, and the median income for a family was $61,813. Males had a median income of $51,964 versus $26,548 for females. The per capita income for the CDP was $23,864. About 7.9% of families and 7.9% of the population were below the poverty line, including 9.2% of those under age 18 and 4.8% of those age 65 or over.