If your state was a California county it would be…
| State | Population | CA County | Population |
|---|---|---|---|
| Wyoming | 576,851 | San Mateo | 737,888 |
| Vermont | 643,077 | San Mateo | 737,888 |
| Alaska | 733,391 | San Mateo | 737,888 |
| North Dakota | 779,094 | San Joaquin | 789,410 |
| South Dakota | 886,667 | Kern | 917,673 |
| Delaware | 989,948 | Fresno | 1,013,581 |
| Montana | 1,084,225 | Contra Costa | 1,161,413 |
| Rhode Island | 1,097,379 | Contra Costa | 1,161,413 |
| Maine | 1,362,359 | Sacramento | 1,588,921 |
| New Hampshire | 1,377,529 | Sacramento | 1,588,921 |
| Hawaii | 1,455,271 | Sacramento | 1,588,921 |
| West Virginia | 1,793,716 | Santa Clara | 1,885,508 |
| Idaho | 1,839,106 | Santa Clara | 1,885,508 |
| Nebraska | 1,961,504 | San Bernardino | 2,194,710 |
| New Mexico | 2,117,522 | San Bernardino | 2,194,710 |
| Kansas | 2,937,880 | Orange | 3,167,809 |
| Mississippi | 2,961,279 | Orange | 3,167,809 |
| Arkansas | 3,011,524 | Orange | 3,167,809 |
| Nevada | 3,104,614 | Orange | 3,167,809 |
| Iowa | 3,190,369 | San Diego | 3,286,069 |
| Utah | 3,271,616 | San Diego | 3,286,069 |
Also, the only states larger than Los Angeles County (9,829,544) are Michigan, North Carolina, Georgia, Ohio, Illinois, Pennsylvania, New York, Florida, Texas, and California of course.
Also, Puerto Rico, whose population apparently dropped 11.8% from 2010 to 2020, still would be larger by population than 21 US states.