Highway District VI, formed in 1911, originally included Madera, Merced, Mariposa, Fresno, Kings, Tulare, Mono, and Inyo Counties. Two major district boundary changes occurred, one in 1924, with the transfer of Mono and Inyo Counties to District IX, and in 1933, with the transfer of Mariposa and Merced to District X. (See District IX and District X finding aids for records of Mono, Inyo, Mariposa, and Merced Counties). District headquarters, under the direction of a District Engineer, was located in Fresno.

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