West County may refer to

• Contra Costa County, California#West County, the area near or on San Francisco and San Pablo bays
• West County, a name for the western part of St. Louis County, Missouri used by residents of the Greater St. Louis area of Missouri and Illinois

• Dublin County West (Dáil constituency), a short-lived parliamentary constituency represented in Dáil Éireann, the lower house of the Irish parliament
• West County Center, a shopping mall located in Des Peres, Missouri.
• West County Trail, an electric interurban railway in Sonoma County, California, United States