Average Age at Time of First Birth & Number of Children Per Woman, by Educational Attainment Level & Nativity

Santa Clara & San Mateo Counties

Less Than a Bachelor’s Degree24.926.62.072.14
Bachelor’s Degree or Higher31.532.11.671.63
Native Born29.91.83
All Women28.330.51.901.84

Data Source:

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


Silicon Valley Institute for Regional Studies

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. Silicon Valley includes Santa Clara & San Mateo Counties. Average Age of Mother At Time of First Birth is calculated as the average age of women who gave birth to their first child that year. 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 that year. For 2008 data, those giving birth to their “6th child and over” were counted as having their 6th child for the purposes of creating an average; for 2018 data, those who had given birth to “8 or more” children were counted as having their 8th 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 by educational attainment level does not include women whose education attainment level was unknown or excluded. Foreign-born women include those born outside of the U.S. (including possessions); native-born women include those born within the 50 U.S. states.

Only includes women who gave birth during that particular year.

Resources for Relevant Data and Reports (show)

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