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Figure D5 is a State map of California showing substate region definitions in terms of counties.
The substate region referred to as Region 1 is made up of county/counties Butte, Colusa, Del Norte, Glenn, Humboldt, Lake, Lassen, Mendocino, Modoc, Plumas, Shasta, Siskiyou, Tehama, Trinity.
The substate region referred to as Region 2 is made up of county/counties El Dorado, Napa, Nevada, Placer, Sacramento, Sierra, Solano, Sonoma, Sutter, Yolo, Yuba.
The substate region referred to as Region 3 is made up of county/counties Alpine, Amador, Calaveras, Merced, San Joaquin, Stanislaus, Tuolumne.
The substate region referred to as Region 4 is made up of county/counties Marin, San Francisco, San Mateo.
The substate region referred to as Region 5 is made up of county/counties Alameda, Contra Costa.
The substate region referred to as Region 6 (Santa Clara) is made up of county/counties Santa Clara.
The substate region referred to as Region 7 is made up of county/counties Monterey, San Benito, Santa Cruz.
The substate region referred to as Region 8 is made up of county/counties Fresno, Kings, Madera, Mariposa, Tulare.
The substate region referred to as Region 9 is made up of county/counties Kern, San Luis Obispo.
The substate region referred to as Region 10 is made up of county/counties Santa Barbara, Ventura.
The substate region referred to as Region 11 (Los Angeles) is made up of county/counties Los Angeles.
The substate region referred to as Region 12 is made up of county/counties Inyo, Mono, San Bernardino.
The substate region referred to as Region 13 (Riverside) is made up of county/counties Riverside.
The substate region referred to as Region 14 (Orange) is made up of county/counties Orange.
The substate region referred to as Region 15 is made up of county/counties Imperial, San Diego.