| Sorted by percent Hispanic 1990 | ||||||
| County | Total Population 1980 | Hispanic:Total 1980 | 1980 % Hispanic | Total Population 1990 | Hispanic: Total 1990 | 1990 % Hispanic |
| Imperial County | 92110 | 51384 | 56% | 109303 | 71935 | 66% |
| San Benito County | 25005 | 11430 | 46% | 36697 | 16800 | 46% |
| Tulare County | 245738 | 73298 | 30% | 311921 | 120893 | 39% |
| Los Angeles County | 7477503 | 2066103 | 28% | 8863164 | 3351242 | 38% |
| Fresno County | 514621 | 150790 | 29% | 667490 | 236634 | 35% |
| Madera County | 63116 | 16916 | 27% | 88090 | 30400 | 35% |
| Kings County | 73738 | 19827 | 27% | 101469 | 34551 | 34% |
| Monterey County | 290444 | 75129 | 26% | 355660 | 119570 | 34% |
| Colusa County | 12791 | 2493 | 19% | 16275 | 5424 | 33% |
| Merced County | 134560 | 34054 | 25% | 178403 | 58107 | 33% |
| Kern County | 403089 | 87026 | 22% | 543477 | 151995 | 28% |
| San Bernardino County | 895016 | 165863 | 19% | 1418380 | 378582 | 27% |
| Santa Barbara County | 298694 | 55356 | 19% | 369608 | 98199 | 27% |
| Ventura County | 529174 | 113192 | 21% | 669016 | 176952 | 26% |
| Riverside County | 663166 | 124417 | 19% | 1170413 | 307514 | 26% |
| San Joaquin County | 347342 | 66565 | 19% | 480628 | 112673 | 23% |
| Orange County | 1932709 | 286339 | 15% | 2410556 | 564828 | 23% |
| Stanislaus County | 265900 | 39889 | 15% | 370522 | 80897 | 22% |
| Santa Clara County | 1295071 | 226611 | 17% | 1497577 | 314564 | 21% |
| San Diego County | 1861846 | 275177 | 15% | 2498016 | 510781 | 20% |
| Santa Cruz County | 188141 | 27648 | 15% | 229734 | 46797 | 20% |
| Glenn County | 21350 | 2532 | 12% | 24798 | 4958 | 20% |
| Yolo County | 113374 | 19342 | 17% | 141092 | 28182 | 20% |
| San Mateo County | 587329 | 73339 | 12% | 649623 | 114627 | 18% |
| Sutter County | 52246 | 6098 | 12% | 64415 | 10592 | 16% |
| Napa County | 99199 | 8636 | 9% | 110765 | 15941 | 14% |
| Alameda County | 1105379 | 129962 | 12% | 1279182 | 181805 | 14% |
| San Francisco County | 678974 | 83373 | 12% | 723959 | 100717 | 14% |
| Solano County | 235203 | 24773 | 11% | 340421 | 45517 | 13% |
| San Luis Obispo County | 155435 | 14792 | 10% | 217162 | 28923 | 13% |
| Sacramento County | 783381 | 74141 | 9% | 1041219 | 121544 | 12% |
| Yuba County | 49733 | 4367 | 9% | 58228 | 6728 | 12% |
| Contra Costa County | 656380 | 55820 | 9% | 803732 | 91282 | 11% |
| Mono County | 8577 | 405 | 5% | 9956 | 1126 | 11% |
| Sonoma County | 299681 | 20824 | 7% | 388222 | 41223 | 11% |
| Lassen County | 21661 | 1417 | 7% | 27598 | 2883 | 10% |
| Tehama County | 38888 | 2127 | 5% | 49625 | 5124 | 10% |
| Del Norte County | 18217 | 1018 | 6% | 23460 | 2414 | 10% |
| Mendocino County | 66738 | 3688 | 6% | 80345 | 8248 | 10% |
| Inyo County | 17895 | 1084 | 6% | 18281 | 1536 | 8% |
| Amador County | 19314 | 917 | 5% | 30039 | 2520 | 8% |
| Placer County | 117247 | 8211 | 7% | 172796 | 13871 | 8% |
| Marin County | 222568 | 9204 | 4% | 230096 | 17930 | 8% |
| Tuolumne County | 33928 | 1781 | 5% | 48456 | 3726 | 8% |
| Butte County | 143851 | 7542 | 5% | 182120 | 13606 | 7% |
| Modoc County | 8610 | 356 | 4% | 9678 | 701 | 7% |
| Lake County | 36366 | 1882 | 5% | 50631 | 3633 | 7% |
| El Dorado County | 85812 | 3971 | 5% | 125995 | 8777 | 7% |
| Alpine County | 1097 | 42 | 4% | 1113 | 74 | 7% |
| Siskiyou County | 39732 | 1891 | 5% | 43531 | 2549 | 6% |
| Sierra County | 3073 | 196 | 6% | 3318 | 184 | 6% |
| Calaveras County | 20710 | 911 | 4% | 31998 | 1714 | 5% |
| Mariposa County | 11108 | 504 | 5% | 14302 | 697 | 5% |
| Plumas County | 17340 | 636 | 4% | 19739 | 907 | 5% |
| Humboldt County | 108514 | 3736 | 3% | 119118 | 4989 | 4% |
| Nevada County | 51645 | 1532 | 3% | 78510 | 3269 | 4% |
| Shasta County | 115715 | 3455 | 3% | 147036 | 5652 | 4% |
| Trinity County | 11858 | 319 | 3% | 13063 | 431 | 3% |