 The Seattle metropolitan area concentrated 76% of the state PEV registrations, with 18,154 plug-ins in King County (59%), where the city of Seattle is located, 3,153 in Snohomish County (10.3%), and 2,040 in Pierce County (6.6%).Outside the metro area, Clark County has the largest number of PEV registrations with 1,467 units (4.8%).Washington was the top selling all-electric car market in the U.S. at the state level in 2013 with a 1.40% market share of new light-vehicle registrations, ahead of California (1.28%).