Largest populations without a public university in commuting range that is not highly selective

[Corbett]

CSULB is not the best example, due to the strong local area preference it uses (as the article describes and links to), and the existence of two other less selective CSUs nearby.

It’s true that CSULB does have a strong local preference, so a local B student still has a shot there. On other hand, the admissions standards have risen even for locals, so there has still been a loss of accessibility. As noted in the article:

the minimum academic requirements now are at least 10 percent higher for local applicants than they were just five years ago, meaning that thousands of area students who would have qualified for admission then are today ineligible.

And it’s also true that local students still have options at nearby CSUDH and CSULA. On the other hand, it’s become much harder for students in the CSUDH and CSULA service areas to attend CSULB. A school like South High in Torrance, for example, is only 16 miles from CSULB, but that’s technically not “local” because it is outside the service area. So again, there has been a loss of accessibility:

The Long Beach campus was once a fairly common option for South Bay students heading off to college. But now, that practically neighborhood campus might as well be located across the state.

In recent years, the number of South Bay students attending Long Beach State has fallen precipitously, both among recent high school graduates and community college transfer students.
https://www.dailybreeze.com/2011/04/17/want-to-go-to-csulb-good-luck/