• Demographics
• Health
• Education
• Wellbeing
• Engagement
• Definitions

Demographics

Number of Children and Youth Under 25, Percent of Total County Population, and Age Distribution
U.S. Census Bureau, 2023: American Community Survey 5-Year Estimates;
Age, Sex, Race and Origin, Table S0101

Language Spoken at Home, Total Population of San Mateo County
U.S. Census Bureau, 2023: American Community Survey 5-Year Estimates Languages Spoken at Home for Population 5 years and Over, Table S1601

Percent of Youth Born Outside the United States
U.S. Census Bureau, 2023; American Community Survey 1-Year Estimates, Table S0501

Note: Foreign born population is defined by the Census Bureau as anyone who is not a U.S. citizen at birth, including those who later become U.S. citizens through naturalization.

Percent of Children (0-17) with One or More Parents who are Immigrants
U.S. Census Bureau, 2024: American Community Survey 1-Year Estimates, Table C05009

Note: The categories of one or more parent foreign-born for 6 and under and 6-17 were combined.

Percent of Families With at Least One Member Under 18 and Average County Family Size
U.S. Census Bureau, 2023: American Community Survey 5-Year Estimates, Table DP02

Note: The Census Bureau defines a household as all persons who occupy a housing unit as their usual place of residence. A family is defined as a group of two people or more (one of whom is the householder) related by birth, marriage, or adoption and residing together. The average family size in San Mateo County is 3.30 persons.

Federal Poverty Rates
U.S. Census Bureau, 2023: American Community Survey 5-Year Estimates, Table S1701

Poverty Status in the Past 12 Months by Sex by Age, San Mateo County, California, Below poverty level, Under 18 years

California Poverty Measure
Public Policy Institute of California, California Poverty by County, https://www.ppic.org/interactive/california-poverty-by-county-and-legislative-district/

Note: Measure is produced by PPIC and the Stanford Center on Poverty and Inequality. Data from PPIC, October 2023.

Education

The Big Lift,
Key Research Findings The Big Lift Evaluation: Research Findings 5-Years in, Data Request

This measure was tracked and provided by the San Mateo County’s Human Services Agency.

3rd Graders and 8th Graders Meeting or Exceeding Literacy and Math Standards
California Department of Education, California Assessment of Student Performance and Progress, FY 2024-25

Detailed Test Results for San Mateo County and California Breakdown by Race
https://caaspp-elpac.cde.ca.gov/caaspp/

Wellbeing

Percent of Children who Exited to a Permanent Placement Within 12 Months of Entering Foster Care,
California Child Welfare Indicators Project (CCWIP),
University of California at Berkeley California Department of Social Services, Child Welfare Statistics and Analysis Section (CWSAS), 2024

Foster care entry cohort outcomes, California CWS Outcomes System: Of all children who entered foster care in a 12-month period, what percent discharged to permanency within 12 months https://ccwip.berkeley.edu/childwelfare/ reports/P1/MTMG/cws/cwsCw/l4-P1 Report California Child Welfare, 2024

Number and Location of Families Experiencing Homelessness in the 2024 San Mateo County One Day Homeless

Count 2024 San Mateo County One Day Homeless Count and Survey Prepared by the San Mateo County Human Services Agency, Center on Homelessnesshttps://www.smcgov.org/hsa/2024-one-day-homeless-count

Number of Juveniles Arrested for Misdemeanors and Felonies, 2024
California Department of Justice, Open Justice Data Portal, Office of the Attorney General San Mateo County,

Arrests, All Juveniles, Data for 2024
https://openjustice.doj.ca.gov/exploration/crime-statistics/arrests
Note: Arrest data is for all of San Mateo County, encompassing County and non-County law enforcement entities.

Engagement

Percent of Parks Programs Targeted Towards Children
FY 2025-27 Budgeted County of San Mateo, Parks Department, Data Request This measure was tracked and provided by the County Parks Department.

17.5 to 25-Year-Olds Registered to Vote
The California Secretary of State (n.d.). Voter Registration Statistics, Report of Registration , Registration by Age Range by County, 2024. www.sos.ca.gov/ elections/report-registration/ror-oddyear-2023

State of California Department of Finance (n.d.). County and State Population Projections (2020-2070) by Age. Retrieved September 2020 from https://www. dof.ca.gov/Forecasting/Demographics/ Projections/

https://scorecard.childrennow. org/?ind=registeredToVote

Note: 2024 population estimates for 17.5-25-year-olds from the Department of Finance. Numbers and percentages are rounded to the nearest whole number.

Number of Students Reached Across Office Of Sustainability Programs
FY 2025 County of San Mateo, Office of Sustainability, Data Request. This measure was tracked and provided
by the Office of Sustainability. This number includes joint activities and presentations with other partner agencies and departments.