The new 2023 numbers classify an individual making $104,400 annually as “low income” in San Francisco, San Mateo and Marin counties. For a family of four in those three counties, $149,100 a year is considered low income. That number has increased dramatically over just a few years. In 2018, $117,400 was classified as low income for four-person families in San Francisco, San Mateo and Marin counties.