There are 4635 Plumbing Services in Washington, serving a population of 7,169,967 people in an area of 66,439 square miles. There is 1 Plumbing Service per 1,546 people, and 1 Plumbing Service per 14 square miles.
The state of Washington is ranked 18th in Plumbing Services per capita, and 23rd in Plumbing Services per square mile.