According to the United States Census Bureau, the CDP has a total area of 7.3 square miles (19.0 km2), of which, 7.3 square miles (18.9 km2) of it is land and 0.04 square miles (0.1 km2) of it (0.41%) is water.
According to the Frederickson Community Plan published by Pierce County (May 1, 2003) Frederickson’s total area is 8,003 acres or 12.5 square miles.
As of the census of 2000, there were 5,758 people, 1,877 households, and 1,542 families residing in the CDP. The population density was 789.6 people per square mile (305.0/km2). There were 1,963 housing units at an average density of 269.2/sq mi (104.0/km2).
There were 1,877 households, out of which 46.1% had children under the age of 18 living with them, 69.0% were married couples living together, 8.6% had a female householder with no husband present, and 17.8% were non-families. 12.8% 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 3.03 and the average family size was 3.28.
In the CDP, the population was spread out, with 31.1% under the age of 18, 7.1% from 18 to 24, 35.2% from 25 to 44, 20.0% from 45 to 64, and 6.7% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 107.8 males. For every 100 females age 18 and over, there were 107.1 males.
The median income for a household in the CDP was $56,862, and the median income for a family was $57,060. Males had a median income of $41,439 versus $28,690 for females. The per capita income for the CDP was $19,385. About 5.8% of families and 7.4% of the population were below the poverty line, including 9.8% of those under age 18 and 14.3% of those age 65 or over. Source: (Wikipedia)