King County’s electric fleet, July 2026
King County had 138,528 plug-in vehicles registered in July 2026. The split is the interesting part: 114,671 battery-electric cars, up 10.0% on the year, against 23,857 plug-in hybrids, up 1.8%. Battery-electrics are 83% of the fleet.
The statewide post charts the total; this is the county underneath it, and the question it answers is whether the plug-in hybrid was a transition or a destination. The two lines have very different slopes, and the gap between them has widened every year — the hybrid with a cord looks less like a step toward the battery car than like a product the battery car went around.
These are registrations in force, not sales: a stock that grows when cars are bought and shrinks when they leave the state or the road, so a month that falls is not a month nobody bought an EV. Vehicles are counted where they are registered, which is the owner’s address rather than where the car is driven.
Source: Washington State Department of Licensing, Electric Vehicle Population Size History By County, via data.wa.gov 3d5d-sdqb, King County rows, registrations in force. Auto-generated each build.