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District Counties Website Social Media Channels
HQ Caltrans Headquarters
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1 Del Norte, Humboldt, Lake, Mendocino
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2 Lassen, Modoc, Plumas, Shasta, Siskiyou, Tehama, Trinity
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3 Butte, Colusa, El Dorado, Glenn, Nevada, Placer, Sacramento, Sierra, Sutter, Yolo, Yuba
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4 Alameda, Contra Costa, Napa, Marin, San Francisco, San Mateo, Santa Clara, Solano, Sonoma
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5 Monterey, San Benito, San Luis Obispo, Santa Barbara, Santa Cruz
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6 Fresno, Kern, Kings, Madera, Tulare
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7 Los Angeles, Ventura
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8 Riverside, San Bernardino
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9 Inyo, Mono, Eastern Kern
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10 Alpine, Amador, Calaveras, Mariposa, Merced, San Joaquin, Stanislaus, Tuolumne
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11 Imperial, San Diego
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12 Orange
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Rail Caltrans Division of Rail
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