Allen is located in Washington. Allen, Washington has a population of 2,199.
The median household income in Allen, Washington is $71,875. The median household income for the surrounding county is $59,263 compared to the national median of $57,652. The median age of people living in Allen is 46.9 years.
The average high temperature in July is 73.1 degrees, with an average low temperature in January of 36.7 degrees. The average rainfall is approximately 33.4 inches per year, with 2.4 inches of snow per year.