Electric vehicles on Washington roads, August 2026
291,146 electric vehicles were registered in Washington in August 2026, up 11.8% from a year earlier. King County holds 140,695 of them — 48% of the state’s fleet, in a county with about a third of its people.
This is a stock, not sales: it counts the EVs registered and on the road in that month, so it falls only when cars leave the fleet faster than they join it. That makes the slope, rather than the level, the thing to read — a flattening line means adoption slowing, not the fleet shrinking.
Battery-electric and plug-in hybrid vehicles are both counted here; the mix between them is its own post, and the two have not grown at the same rate.
Source: Washington State Department of Licensing, Electric Vehicle Population, via data.wa.gov (Socrata 3d5d-sdqb). Counts vehicles registered in the month, not sales. Auto-generated each build.