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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.

FOTW #1309, September 25, 2023

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 December 31, 2022, were used as a proxy for sales.

Source: Arthur Yip, National Renewable Energy Laboratory, 2023.