According to the Phoenix Business Journal:
More than 653,000 Californians moved to another state in 2019, while about 480,000 people moved here from elsewhere in the country, according to data from the Census Bureau’s American Community Survey. (The 2020 numbers aren’t available, but analyses of other 2020 data sets have yielded similar results.)
These were the top destinations for Californians leaving:
Texas (82,235 people in Texas had moved from California in the last year)
Arizona (59,713)
Nevada (47,322)
Washington (46,791)
Oregon (37,927)