According to registration data used as a proxy for sales, there were four counties in the United States with electric vehicle (EV) market penetration above 30% as of December 2022, and all were in California.

Santa Clara County topped the list at 35%, followed by Marin County at 34%, and then Alameda and San Mateo Counties at 32% each.

Several counties outside of California also had robust EV sales, including Boulder County, Colorado (22%) and San Juan County, Washington (22%). As of the end of 2022, there were 100 counties where EV market penetration was 10% or more.

Note: Includes light-duty all-electric and plug-in hybrid electric vehicles. Registration data for model year 2022 vehicles registered in each county as of 31 December 2022, were used as a proxy for sales. Source: Arthur Yip, National Renewable Energy Laboratory, 2023