[1] It is located 3 miles (4.8 km) southeast of downtown Novato,[2] at an elevation of 30 feet (9 m).

[1] Ignacio is a neighborhood located west of Bel Marin Keys, CA.

According to the U.S. Geological Survey (USGS), it is located at 38°04′13″N 122°32′19″W / 38.07028°N 122.53861°W / 38.07028; -122.53861, placing it north of the interchange of U.S. Route 101 and Ignacio Boulevard, in Novato.

[1] Two authenticated Coast Miwok villages existed near Ignacio: Puyuku (south of the town) and Shotokmo-cha (to the southeast).

During World War II, Ignacio became the site of military housing for Hamilton Air Force Base.