Overview
          4,976
                  Total Population
                47.7
                  Median age
                55.12%
                  Female population %
                81.4:100
                  Gender ratio (M:F)
                50-54 years
                  Largest age group
                60.4
                  Total dependency ratio
                White
                  Largest racial group
                158
                  Hispanic population
                Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
TABLE OF CONTENTS
Age
Mendham's population is old compared to the rest of the country:
- The median age in Mendham is 47.7, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
- Mendham's population under 18 was 23.65%, compared to the 22.51% nationwide.
- Mendham's elderly or the senior population (over 65 age) was 20.36% as compared to 16.04% nationwide.
- Of the total population in Mendham, 17.28% were under the age of 15, 16.64% aged 15 to 29, 45.72% aged 30 to 64, 15.76% aged 65 to 84, and 4.60% were 85 years of age and older.
 
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Gender
There are 510 more females than males in Mendham:
- The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 55.12% females and 44.88% males in Mendham, NJ.
- The Mendham, NJ gender ratio is 81.4:100 i.e. 81.4 men to 100 women (0.814).
- For male population, the largest age group is 50-54 years with a population of 255.
- For the female population, the largest age group is 50-54 years with a population of 293.
 
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Race / Ethnicity
Mendham's population has become increasingly diverse:
- Racial distribution of Mendham population: 90.35% are White, 0.92% are Black or African American, 4.16% are Asian and 4.56% are multiracial.
- Mendham's racial breakdown clearly shows that there is an absolute majority of White population in the borough.
- By ethnicity, 158 is Hispanic or Latino (of any race), and 4,818 (96.82% of the total population) is Non-Hispanic.
- The largest racial group in Mendham is White with a population of 4,496 (90.35% of the total population).
 
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Year by year
Mendham's population has already reached its peak and is showing a trend of decline:
- The peak population was 5,111 in the year 2005
- From 2000 to 2010, Mendham's population decreased by 92 (1.81%), as compared to the national growth of 9.63%.
- From 2010 to 2020, Mendham's population decreased by 28 (0.56%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
- Between the year 2000 and 2022, Mendham's population was lowest in year 2019 at 4,845.
 
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References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates
- U.S. Census Bureau Population Estimates Population Estimates Program (PEP)
