Census: Washington state population increases to 7.7 million April 26, 2021 FacebookTwitterEmail Daffodils bloom outside the Legislative Building, Wednesday, April 21, 2021, at the Capitol in Olympia, Wash.Ted S. Warren/AP OLYMPIA, Wash. (AP) — The population of Washington state grew by nearly 15% over the past 10 years to more than 7.7 million, according to figures released Monday by the U.S. Census Bureau. That was a much sharper pace of increase than the national population, which rose by 7.4%, the second-slowest ever. Census officials say the 2020 U.S. population is now more than 331.4 million. Despite Washington’s population jump it won’t be getting any more U.S. House seats. It’s number will stay at 10.