| 4,955 | (18%) | |
| 3,222 | (12%) | |
| 3,028 | (11%) | |
| 2,873 | (11%) | |
| 2,703 | (10%) | |
| 2,204 | (8%) | |
| 1,893 | (7%) | |
| 1,530 | (6%) | |
| 1,502 | (6%) | |
| 1,498 | (6%) | |
| 1,313 | (5%) | |
| 54 | (0%) |
Source: U.S. Census Bureau - A.C.S 2007
| 55,484 | (100%) | |
| 40,508 | (73%) | |
| 9,685 | (18%) | |
| 4,061 | (7%) | |
| 2,117 | (4%) | |
| 680 | (1%) | |
| 567 | (1%) |
Castro Valley California's population is estimated to be approximately 55,484. There are 40,508 White residents which make up 73.00 % of the states' population. The remaining population is made up of 9,685 Asians, 4,061 Blacks, 2,117 Others, 680 Native Americans, and 567 Hawaiian & Pacific Islanders.
