Santa Clara & San Mateo Counties, and California

Age at Time of First Birth & Number of Children Per Woman, by Educational Attainment Level
Santa Clara & San Mateo Counties
2005 2015
All Women Less than a Bachelor’s Degree Bachelor’s Degree or Higher All Women
Average Age of Mothers at Time of First Birth 28.4 26.2 31.8 29.8
Number of Children per Woman 1.89 2.16 1.64 1.86

Data Source:

CHART: California Department of Finance

TABLE: U.S. Department of Health and Human Services, CDC WONDER


CHART & TABLE: Silicon Valley Institute for Regional Studies

CHART: Data are from the California Department of Finance E-6 Population Estimates and Components of Change by County. Silicon Valley data are for San Mateo and Santa Clara Counties. Estimates for 2017 are preliminary.

TABLE: Data is from the United States Department of Health and Human Services (US DHHS), Centers for Disease Control and Prevention (CDC), National Center for Health Statistics (NCHS), Division of Vital Statistics, Natality public-use data 2003-2006, on CDC WONDER Online Database, March 2009. It includes Santa Clara & San Mateo Counties, combined. Average Age of Mother At Time of First Birth is calculated as the average age of women who gave birth to their first child in 2015. Women with a bachelor’s degree or higher includes Bachelor’s degree (BA, AB, BS), Master’s degree (MA, MS), Doctorate (PHD, EdD) or Professional Degree (MD, DDS, DVM, LLB, JD). Women with less than a bachelor’s degree includes 8th grade or less, 9th through 12th grade with no diploma, High school graduate or GED completed, Some college credit but not a degree, and Associate degree (AA, AS). The average number of children per women is calculated only for those women who gave birth in 2015, and those giving birth to their “6th child and over” were counted as having their 6th child for the purposes of creating an average. It includes live births only, and is a snapshot in time; it is not a replacement for a true population-level fertility rate. Data for Santa Clara and San Mateo counties for “unknown or not stated” birth order was suppressed.

CHART: This chart does not have any footnotes.

TABLE: Only includes women who gave birth in 2015.

Resources for Relevant Data and Reports (show)

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