Greenbrae is a small community located at the opening of the Ross Valley, with a portion of the community being in an unincorporated area of the county, and a portion being within the city of limits of neighboring Larkspur.

Greenbrae is well known for its tastefully landscaped custom homes, many of which have views of the bay, Corte Madera Creek and lowlands, and Mt. Tamalpais. A special effort was made during the development of this area to preserve the hundreds of majestic oak trees that grace the hillsides. Greenbrae residents enjoy a one minute drive to the freeway and two minutes to the Larkspur Landing Ferry Terminal.

Greenbrae is also home to Bon Air Shopping Center, which features over 50 unique shops and restaurants, as well as Marin General Hospital, Marin's acute care hospital.