| Alameda | Contra Costa | Marin | Napa | San Mateo | Santa Clara | Solano | Sonoma | San Francisco |
| 1860 | 8927 | 5328 | 3334 | 5521 | 3214 | 11912 | 7169 | 11867 | 56802 |
| 1870 | 24237 | 8461 | 6903 | 7163 | 6635 | 26246 | 16871 | 19819 | 149473 |
| 1880 | 62976 | 12525 | 11324 | 13235 | 8669 | 35039 | 18475 | 25926 | 233959 |
| 1890 | 93864 | 13515 | 13072 | 16411 | 10087 | 48005 | 20946 | 32721 | 298997 |
| 1900 | 130197 | 18046 | 15702 | 16451 | 12094 | 60216 | 24143 | 38480 | 342782 |
| 1910 | 246131 | 31674 | 25114 | 19800 | 26585 | 83539 | 27559 | 48394 | 416912 |
| 1920 | 344177 | 53889 | 27342 | 20678 | 36781 | 100676 | 40602 | 52090 | 506676 |
| 1930 | 474883 | 78608 | 41648 | 22897 | 77405 | 145118 | 40834 | 62222 | 634394 |
| 1940 | 513011 | 100450 | 52907 | 28503 | 111782 | 174949 | 49118 | 69052 | 634536 |
| 1950 | 740315 | 298984 | 85619 | 46603 | 235659 | 290547 | 104833 | 103405 | 775357 |
| 1960 | 908209 | 409030 | 146820 | 65890 | 444387 | 642315 | 134597 | 147375 | 740316 |
| 1970 | 1073184 | 558389 | 206038 | 79140 | 556234 | 1064714 | 169941 | 204885 | 715674 |
| 1980 | 1105379 | 656380 | 222568 | 99199 | 587329 | 1295071 | 235203 | 299681 | 678794 |
| 1990 | 1279182 | 803732 | 230096 | 110765 | 649623 | 1497577 | 340421 | 388222 | 723959 |
| 2000 | 1443741 | 948816 | 247289 | 124279 | 707161 | 1682585 | 394542 | 458614 | 776733 |
| 2010 | 1510271 | 1049025 | 252409 | 136484 | 718451 | 1781642 | 413344 | 483878 | 805235 |
| 2020 | 1682353 | 1165927 | 262231 | 138019 | 764442 | 1936259 | 453491 | 488863 | 873965 |
santa clara is in the thick of it