San Miguel, CA

united states

San Miguel is a quiet East Bay community in Contra Costa County, about 25 miles northeast of San Francisco. Highway 4 is the main route in, connecting west to I-680 and the broader Bay Area or east toward Antioch. Most traffic consists of daily commuters heading to Walnut Creek and other job centers. The town sits near Black Diamond Mines Regional Preserve, where you can tour underground coal mining tunnels from the 1800s.