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Nonmarital Births by Year, New Jersey and the United States, 1970 to 2022

Indicator Report Data View Options

Why Is This Important?

Nonmarital births are at higher risk of having adverse birth outcomes such as low birthweight, preterm birth, and infant mortality than are children born to married women.[ ^1^] Children born to single mothers typically have more limited social and financial resources.[ ^2^]


Marital status was determined by response to the following questions on the birth certificate: *For years 1970-1978 - Legitimate? *For years 1979-1988 - Is mother married? *For years after 1988 - Mother married? (At birth, conception, or any time between)

Data Notes

The proportion of NJ resident birth records with unknown marital status was less than 1% prior to 1996. Unknown marital status is included in the denominator for 1970-1995, but is excluded beginning with 1996.[[br]]California ceased reporting marital status in 2017, so unknown marital status is excluded from the US data beginning with 2017.

Data Sources

How the Measure is Calculated

  • Numerator:

    Number of live births to unmarried mothers
  • Denominator:

    Total number of live births with known marital status

Related Health Status Outcomes Indicators:

Health Topic Pages Related to: Nonmarital Births

Indicator Data Last Updated On 04/09/2024, Published on 04/09/2024
Center for Health Statistics, New Jersey Department of Health, PO Box 360, Trenton, NJ 08625-0360, e-mail: (