States · New Jersey · Mercer County

Hamilton Square, New Jersey.

A community in Mercer County, with no city government of its own. Zillow publishes no home prices for it: see Mercer County’s.

Living in Hamilton Square, Mercer County, New Jersey

Hamilton Square, in Mercer County, had 12,679 people in the 2020 census. Half its households earn more than $138,162 a year and half less, against $100,645 across Mercer County; 2% of its people live below the poverty line. 96% of its homes are lived in by their owners and 4% are rented. Unemployment in Mercer County was 4.9% in August 2026, and the county had 1.1% fewer jobs in 2025 than the year before. The most residents work in schools and health care, then professional services.

People 12,679 in the 2020 census; median age 44.9
Household income $138,162 the median, give or take $8,821 · Mercer County: $100,645
Unemployment 4.9% Mercer County, August 2026; 6.0% a year before
Homes 96% lived in by their owners; 4% rented
  • 4,265households
  • 46%of adults have a degree
  • 2%below the poverty line
  • 26 mintypical commute
  • 19%work from home

What residents work in

  • Schools, hospitals and social care24%
  • Professional and business services12%
  • Shops (retail)10%
  • Government10%
  • Restaurants, hotels and entertainment10%
  • Other services7%

Employed residents by industry, from the Census survey. Mercer County had 261,312 jobs in 2025, 1.1% fewer than the year before (Bureau of Labor Statistics).

Weather through the year

Average daily high and low for each month: coldest in January, 40° and 21°; warmest in July, 87° and 63° 20° 40° 60° 80° J 40° 21° F M A M J J 87° 63° A S O N D
Average daily high and low for each month: coldest in January, 40° and 21°; warmest in July, 87° and 63° 20° 40° 60° 80° J 40° 21° F M A M J J 87° 63° A S O N D

Coldest in January, with highs near 40° and lows near 21°; warmest in July, with highs near 87° and lows near 63°. About 24 inches of snow and 47 inches of rain and melted snow a year.

Average daily high and low, 1991–2020, at the Hightstown West weather station, 5 miles away (NOAA).

Largest workplaces in Hamilton Square

  1. Hamilton Township Public School DistrictSchool district1,811FTE
  2. WalmartWarehouse clubs and supercenters408
  3. Avalon OperatorNursing homes154
  4. preferred care at hamiltonSkilled nursing facilities152
  5. Wawa SiteConvenience store58
  6. Genesis Global Group (Genesis Biotechnology Group)Construction management, residential remodeling43
  7. GenHDBakery products, fresh, made in commercial bakeries27
  8. Natural Resources Conservation ServiceFederal government · Department of Agriculture22

Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 7 workplaces with 20 or more staff, 862 people in all. School districts come from the Common Core of Data (NCES, 2023–24) and federal offices from OPM's federal workforce data (2026); FTE marks full-time equivalent staff. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.

Natural hazards

  1. Strong windRelatively high
  2. Winter weatherRelatively high
  3. Inland floodingRelatively high
  4. Ice stormsRelatively moderate
  5. HurricanesRelatively moderate
  6. Heat wavesRelatively moderate

FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in Hamilton Square’s census tracts, against the rest of the country; all of them together, relatively moderate. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.

From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on Mercer County.