Download the list of Plumbers in Washington. Smartscrapers provides an accurate directory and the latest data on the number of Plumbers in Washington There are 2798 Plumbers in Washington as of April 1, 2026; which is an 0.00% increase from 2023. Of these locations, 2085 Plumbers which is 74.52% of all Plumbers in Washington are single-owner operations, while the remaining 713 which is 25.48% are part of larger brands. The top three cities with the most Plumbers are Seattle with 370 Plumbers, Tacoma with 223 Plumbers, Spokane with 137 Plumbers. Average age of Plumbers in Washington is 6 years and 8 months.