Inyo County was formed in 1866 out of the territory of the unorganized Coso County, which had been created on April 4, 1864, from parts of Mono County and Tulare County. It acquired more territory from Mono County in 1870 and Kern County and San Bernardino County in 1872.
Inyo County was f.ormed in 1866 out of the territory of the unorganized Coso County, which had been created on April 4, 1864, from parts of Mono County and Tulare County. It acquired more territory from Mono County in 1870 and Kern County and San Bernardino County in 1872