Estimated Percent of Related Children Age 5-17 in Families in Poverty for San Mateo County, CA was 7.20% in January of 2022, according to the United States Federal Reserve. Historically, Estimated Percent of Related Children Age 5-17 in Families in Poverty for San Mateo County, CA reached a record high of 10.50 in January of 2012 and a record low of 5.30 in January of 2020. Trading Economics provides the current actual value, an historical data chart and related indicators for Estimated Percent of Related Children Age 5-17 in Families in Poverty for San Mateo County, CA - last updated from the United States Federal Reserve on May of 2024.