I think people tend to forget that before 1900-1940 if you were outside of the city; no electricity.
I don't think you can really make any sort of meaningful conclusion from this - rural areas tend to lag in this sort of innovation.
Not developed by my comment is in 1920 you didn't 'need' a car in cities. Since you had street cars. In rural/small town America cars were really useful but electric cars were a non starter.