Geronimo is a cdp located in Marin County, in the state of California (CA), United States. Nestled in the Pacific division of the West region, it covers an area of 1.5 square miles (4.0 km²) and sits at an elevation of 299 ft. With a population of approximately 436 residents, Geronimo offers a peaceful, rural atmosphere.
The town's population is composed of about 48.17% males and 51.83% females, and it has a population density of 286.84 people per square mile (110.75/km²). Geronimo lies at a latitude of 38.01 and a longitude of -122.67, operating in the UTC-8.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (16.7%), German (23.2%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 94963.