King County’s electric fleet, September 2026
transport
energy
King County had 115,836 battery-electric vehicles and 24,543 plug-in hybrids registered in September 2026 — batteries are 83% of the county’s electric fleet. The battery count is up 7.7% from a year earlier.
The split is the interesting part. Plug-in hybrids were the hedge — battery for the commute, petrol for the mountain pass — and the two lines started the series close together. They are not close now, which is a statement about how far charging infrastructure and range have come rather than about policy.
Registrations are a stock, not sales: this is what was on the road that month.
Source: Washington State Department of Licensing, Electric Vehicle Population, King County, via data.wa.gov (Socrata 3d5d-sdqb). Auto-generated each build.