How Mercer County Compares

Mercer County

39.5 years

New Jersey Average

39.5 years

Rank #14 of 21 in state

National

38.9 years

1.5% above

National Distribution

Where Mercer County falls among all 3,222 U.S. counties for median age.

21.4 years 86.2 years

■ Mercer County: 39.5 years

Ranking Context

Rank	County	Value
#2,262	Stone County, MS	39.5 years
#2,263	Butler County, MO	39.5 years
#2,264	St. Francois County, MO	39.5 years
#2,265	Mercer County, NJ	39.5 years
#2,266	Middlesex County, NJ	39.5 years
#2,267	Bernalillo County, NM	39.5 years
#2,268	Lee County, NC	39.5 years

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Median Age in Mercer County, New Jersey

Mercer County, New Jersey has a median age of 39.5 years, which ranks #2,265 of 3,222 out of 3,222 counties nationwide. This is 1.5% above the national value of 38.9 years.

Within New Jersey, Mercer County ranks #14 of 21 out of 21 counties. This places it in the 30th percentile nationally.

The median age of the total population. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.

About this data

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.