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PEOPLE OVERVIEW : The 2016 Randolph, New Jersey, population is 25,957. There are 1,248 people per square mile (population density). Family in Randolph, New Jersey. The median age is 40.5. The US median is 37.4. 65.90% of people in Randolph, New Jersey, are married. 5.34% are divorced. The average household size is 2.8 people. 44.05% of people are married, with children. 8.16% have children, but are single. Race in Randolph, New Jersey. 74.73% of people are white, 3.02% are black, 11.14% are asian, 0.00% are native american, and 0.21% claim 'Other'. 9.29% of the people in Randolph, New Jersey, claim hispanic ethnicity (meaning 90.71% are non-hispanic).
Population of Mercer County. Last official estimated population of Mercer County was 368,043 (year 2014)[1]. This was 0.115% of total US population and 4.1% of total New Jersey state population. Area of Mercer County is 228.9 miÂ² (=592.8 kmÂ²), in this year population density was 1,607.96 p/miÂ². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Mercer County population in 2017 would be 369,195 .