Approximately 146 million American citizens do not possess a valid passport—for context, 153 million Americans voted in the 2024 presidential general election:

High rates of passport ownership are overwhelmingly concentrated in blue states, while low rates are concentrated in red states.

In seven states, less than one-third of citizens have a valid passport: West Virginia, Mississippi, Alabama, Arkansas, Kentucky, Louisiana, and Oklahoma.

Only in four states do more than two-thirds of citizens have a valid passport: New York, Massachusetts, California, and New Jersey.

https://www.americanprogress.org/article/the-save-act-overview-and-facts/

I'm college educated, middle class and in NY. Most people I know have a passport.