Philo is a census-designated place[5] in Mendocino County, California, United States.

Situated along Indian Creek as it flows into the Navarro River, Philo is the home of KZYX,[7] the local public radio station.

Two small specialty lumber mills in Philo are all that remain of a once vigorous timber economy in Anderson Valley.

California State Route 128 leads southeast (up the valley) 6 miles (10 km) to Boonville and northwest (downriver) 23 miles (37 km) to State Route 1 near Navarro Beach on the Pacific Ocean.

According to the United States Census Bureau, the CDP covers an area of 2.1 square miles (5.4 km2), all of it recorded as land.

There were 117 housing units at an average density of 57.4 per square mile (22.2/km2), of which 35 (35.7%) were owner-occupied, and 63 (64.3%) were occupied by renters.

[10] Federally, Philo is in California's 2nd congressional district, represented by Democrat Jared Huffman.