FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
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| 06001 | CA | Alameda County | 1 | Large-in a metro area with at least 1 million residents or more | 1,443,741 | | 06003 | CA | Alpine County | 4 | Noncore adjacent to a large metro area | 1,208 | | 06005 | CA | Amador County | 4 | Noncore adjacent to a large metro area | 35,100 | | 06007 | CA | Butte County | 2 | Small-in a metro area with fewer than 1 million residents | 203,171 | | 06009 | CA | Calaveras County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 40,554 | | 06011 | CA | Colusa County | 4 | Noncore adjacent to a large metro area | 18,804 | | 06013 | CA | Contra Costa County | 1 | Large-in a metro area with at least 1 million residents or more | 948,816 | | 06015 | CA | Del Norte County | 8 | Micropolitan not adjacent to a metro area | 27,507 | | 06017 | CA | El Dorado County | 1 | Large-in a metro area with at least 1 million residents or more | 156,299 | | 06019 | CA | Fresno County | 2 | Small-in a metro area with fewer than 1 million residents | 799,407 | | 06021 | CA | Glenn County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 26,453 | | 06023 | CA | Humboldt County | 8 | Micropolitan not adjacent to a metro area | 126,518 | | 06025 | CA | Imperial County | 2 | Small-in a metro area with fewer than 1 million residents | 142,361 | | 06027 | CA | Inyo County | 8 | Micropolitan not adjacent to a metro area | 17,945 | | 06029 | CA | Kern County | 2 | Small-in a metro area with fewer than 1 million residents | 661,645 | | 06031 | CA | Kings County | 2 | Small-in a metro area with fewer than 1 million residents | 129,461 | | 06033 | CA | Lake County | 5 | Micropolitan adjacent to a small metro area | 58,309 | | 06035 | CA | Lassen County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 33,828 | | 06037 | CA | Los Angeles County | 1 | Large-in a metro area with at least 1 million residents or more | 9,519,338 | | 06039 | CA | Madera County | 2 | Small-in a metro area with fewer than 1 million residents | 123,109 | | 06041 | CA | Marin County | 1 | Large-in a metro area with at least 1 million residents or more | 247,289 | | 06043 | CA | Mariposa County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 17,130 | | 06045 | CA | Mendocino County | 5 | Micropolitan adjacent to a small metro area | 86,265 | | 06047 | CA | Merced County | 2 | Small-in a metro area with fewer than 1 million residents | 210,554 | | 06049 | CA | Modoc County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 9,449 | | 06051 | CA | Mono County | 9 | Noncore adjacent to micro area and contains a town of 2,500- 9,999 residents | 12,853 | | 06053 | CA | Monterey County | 2 | Small-in a metro area with fewer than 1 million residents | 401,762 | | 06055 | CA | Napa County | 2 | Small-in a metro area with fewer than 1 million residents | 124,279 | | 06057 | CA | Nevada County | 3 | Micropolitan adjacent to a large metro area | 92,033 | | 06059 | CA | Orange County | 1 | Large-in a metro area with at least 1 million residents or more | 2,846,289 | | 06061 | CA | Placer County | 1 | Large-in a metro area with at least 1 million residents or more | 248,399 | | 06063 | CA | Plumas County | 12 | Noncore not adjacent to a metro/micro area and does not contain a town of at least 2,500 residents | 20,824 | | 06065 | CA | Riverside County | 1 | Large-in a metro area with at least 1 million residents or more | 1,545,387 | | 06067 | CA | Sacramento County | 1 | Large-in a metro area with at least 1 million residents or more | 1,223,499 | | 06069 | CA | San Benito County | 1 | Large-in a metro area with at least 1 million residents or more | 53,234 | | 06071 | CA | San Bernardino County | 1 | Large-in a metro area with at least 1 million residents or more | 1,709,434 | | 06073 | CA | San Diego County | 1 | Large-in a metro area with at least 1 million residents or more | 2,813,833 | | 06075 | CA | San Francisco County | 1 | Large-in a metro area with at least 1 million residents or more | 776,733 | | 06077 | CA | San Joaquin County | 2 | Small-in a metro area with fewer than 1 million residents | 563,598 | | 06079 | CA | San Luis Obispo County | 2 | Small-in a metro area with fewer than 1 million residents | 246,681 | | 06081 | CA | San Mateo County | 1 | Large-in a metro area with at least 1 million residents or more | 707,161 | | 06083 | CA | Santa Barbara County | 2 | Small-in a metro area with fewer than 1 million residents | 399,347 | | 06085 | CA | Santa Clara County | 1 | Large-in a metro area with at least 1 million residents or more | 1,682,585 | | 06087 | CA | Santa Cruz County | 2 | Small-in a metro area with fewer than 1 million residents | 255,602 | | 06089 | CA | Shasta County | 2 | Small-in a metro area with fewer than 1 million residents | 163,256 | | 06091 | CA | Sierra County | 7 | Noncore adjacent to a small metro and does not contain a town of at least 2,500 residents | 3,555 | | 06093 | CA | Siskiyou County | 11 | Noncore not adjacent to a metro/micro area and contains a town of 2,500 or more residents | 44,301 | | 06095 | CA | Solano County | 2 | Small-in a metro area with fewer than 1 million residents | 394,542 | | 06097 | CA | Sonoma County | 2 | Small-in a metro area with fewer than 1 million residents | 458,614 | | 06099 | CA | Stanislaus County | 2 | Small-in a metro area with fewer than 1 million residents | 446,997 | | 06101 | CA | Sutter County | 2 | Small-in a metro area with fewer than 1 million residents | 78,930 | | 06103 | CA | Tehama County | 5 | Micropolitan adjacent to a small metro area | 56,039 | | 06105 | CA | Trinity County | 6 | Noncore adjacent to a small metro with town of at least 2,500 residents | 13,022 | | 06107 | CA | Tulare County | 2 | Small-in a metro area with fewer than 1 million residents | 368,021 | | 06109 | CA | Tuolumne County | 5 | Micropolitan adjacent to a small metro area | 54,501 | | 06111 | CA | Ventura County | 2 | Small-in a metro area with fewer than 1 million residents | 753,197 | | 06113 | CA | Yolo County | 1 | Large-in a metro area with at least 1 million residents or more | 168,660 | | 06115 | CA | Yuba County | 2 | Small-in a metro area with fewer than 1 million residents | 60,219 |
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