Mark West is an unincorporated community immediately north of Santa Rosa, California in Sonoma County, California, USA. Mark West is located along Mark West Springs Road adjacent to U.S. Highway 101. The community of Mark West is named for Scottish American pioneer William Marcus West.
After the San Francisco and North Pacific Railroad was extended to Cloverdale in 1870's, its trains stopped in Mark West.
The community is in ZIP code 95492 and area code 707.
Coordinates: 38°30′34″N 122°46′56″W / 38.50944°N 122.78222°W