[3] Lagunitas is located in a mountainous part of Marin County, just north of Kent Lake and east of Samuel P. Taylor State Park.

[4] Kent Lake serves as the primary tributary into the Lagunitas Creek, which flows into the Tomales Bay and from there the Pacific Ocean.

[5] Statistics describing Lagnuitas' demographics are grouped by the U.S. Census with the nearby unincorporated community of Forest Knolls.

[10][11] Lagunitas' main road is Sir Francis Drake Boulevard, which itself runs from its intersection with California State Route 1 just south of Point Reyes Station to the western terminus of Interstate 580 near San Rafael.

SFO has the most international flights of the three airports and can be accessed by a drive on U.S. Route 101, itself connected to Sir Francis Drake Blvd near San Rafael, though both U.S. 101 and SMART also directly link to STS.