The crossword solution for the term 'SAN MATEO, NORTHERN CALIFORNIA CITY' is a 5 letter word, 'MATEO'. SAN Mateo is a CITY located in the SAN Francisco Bay Area of NORTHERN CALIFORNIA. It is the county seat of SAN Mateo County and has a population of approximately 103, 000 people. SAN Mateo is known for its diverse culture, excellent schools, and vibrant downtown area. It is also home to several tech companies, including Oracle, Sony, and Electronic Arts.