1. Start with the Castro Valley service area, not a population claim
The U.S. Census Bureau records Castro Valley as a CDP in Alameda County, California. Its 2020–2024 ACS 5-year population estimate is 65,001, with a margin of error of 2,001. This is useful for defining the place covered by a location page. It cannot tell you how many people need a lawyer, which practices are competitive, how often residents use AI search or how many matters your firm could receive. For AI SEO, the geographic distinction matters because a page about Castro Valley should not silently present Alameda County or all of California as the same market.
Recommended approach
Ask Bosseo to map your actual service geography before deciding which pages deserve attention. Review whether Castro Valley is a location you serve, whether Alameda County is a broader relationship, and whether California-wide information belongs on a separate practice page. Keep household, individual, place and county references distinct. Measure inquiries by stated location rather than treating the CDP population as a forecast.
