Map of Lagunitas-Forest Knolls CDP

Lagunitas-Forest Knolls is a census-designated place, composed of two unincorporated areas in the western half of the San Geronimo Valley in Marin County, California. It is located to the west of San Geronimo and Woodacre. The population was 1,924 at the 2020 census.

The two towns are locally seen as separate. Geographically divided by narrow points in the San Geronimo Valley, each has its own small commercial center. Both towns are primarily residential. The ZIP code of Lagunitas is 94938, while the ZIP code of Forest Knolls is 94933.

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Geography

Lagunitas-Forest Knolls is located at 38°0′54″N 122°41′38″W / 38.01500°N 122.69389°W / 38.01500; -122.69389 (38.015064, -122.693874).

According to the U.S. Census Bureau, the CDP has a total area of 11.0 square kilometers (4.2 sq mi), all of it land.

San Geronimo Creek (a.k.a. Paper Mill Creek), one of the few remaining spawning grounds for Coho salmon (Oncorhynchus kisutch), runs through both towns. Lagunitas Creek, a tributary to San Geronimo Creek, is home to the largest remaining wild run of Coho salmon in Central California. These Coho are part of the Central California Coast Evolutionarily Significant Unit (CCC ESU), and are listed as “endangered” at both the state and federal level.

The towns line the western end of the San Geronimo Valley, extending into the forested south ridges and slightly into the grassier northern ones.

Lagunitas is on the eastern border of Samuel P. Taylor State Park. Like the park, Lagunitas-Forest Knolls and the surrounding environs are lushly vegetated with large areas of coniferous forests.

Hiking and horseback riding are popular in the hills above the towns.

See also