Much of the country's electric vehicle (EV) use is concentrated in the "four corners" of California, the Pacific Northwest, the Northeast and the Southeast, according to data shared with Axios. Two glaring exceptions? Colorado and Hawai'i. The data, from mobility analytics platform Replica, is based on estimated EV miles traveled per 1,000 residents at the county level on a typical weekday in the second quarter of 2023. Replica's data comes from anonymized mobile device info, roadside sensors, transit agencies and more. Marin County, Calif., takes the crown for the most electric miles traveled per 1,000 residents among large counties, at 1,942 on a typical weekday. Santa Clara County, California (1,607) and San Mateo County, California (1,386) follow.