By land mass that's the majority of the country. Population concentration is the real issue.
I live in San Antonio, a metro of 2M people (city itself is one of the 10 most populous in the US). That's pretty sizable. Median home is between 260K and 310K. That is, of course, with the larger homes you'll find here vs SF/Chicago/LA/etc.
In fact that is all that really needs to be done to ameliorate the housing crisis in California: pass a single law that repeals every single zoning adjustment from after say 1960. Or pass a law that mandates a 4:1 ratio of zoned capacity to population. The ship will right itself if it is allowed to.
Where exactly? Not true for the midwest. E.g. (1,2,3)
1. https://www.zillow.com/homedetails/933-Atmore-Ct-Indianapoli...
2. https://www.zillow.com/homedetails/10916-S-Wabash-Ave-Chicag...
3. https://www.zillow.com/homedetails/3920-15th-Ave-S-Minneapol...
Here's what you might find 20 miles outside boston, this one is 350k:
https://www.zillow.com/homedetails/55-Emory-St-Brockton-MA-0...
Source? This is completely inconsistent with my experience.