Hamilton
RANK #694 / 996 NAT · #16 / 21 NJ · POP 383,732
1YR FORECAST: +0.0%
5YR OUTLOOK: +19%
Mercer County, New Jersey, is distinguished by Princeton University, an Ivy League research institution, and Drumthwacket, the official residence of the New Jersey governor. Located centrally in New Jersey, it sits about an hour from both New York City and Philadelphia. The county offers a mix of urban centers like Trenton, suburban neighborhoods, and rural areas with preserved farmland. Over 27% of Mercer County is preserved open space, including 10,000 acres of parklands and 16,000 acres of farms, forests, and meadows, providing opportunities for hiking, golf, and boating. Commute options include Amtrak, NJ Transit rail, and bus services, with Trenton-Mercer Airport also serving the area.
Life in Mercer County often involves a balance of community amenities and access to larger metropolitan areas. The public school systems, such as West Windsor-Plainsboro Regional and Princeton Public Schools, are highly rated. The county's economy is diverse, with significant contributions from higher education, research, and government services. Recent economic developments show growth in scientific fields, particularly biotechnology and pharmaceuticals, with new companies establishing a presence. The healthcare industry also continues to expand, and there is ongoing investment in manufacturing and advanced production methods.
Below national median
Well below national median
Below-average climate & terrain
Housing looks undervalued at 2.7x — home prices are low relative to local economic output. The typical U.S. county is 4–6x.
Estimated local headcount ranges. Larger employers shown as floor + "+"; smaller employers show exact counts where reported.
Source: Redfin · Census BPS — Browse sales on Redfin →
Source: CDC/NCHS vital statistics via County Health Rankings (2020–2022 avg). Rates per 100,000 population. Grade based on homicide rate relative to national average (~6.3). Learn more →
Source: EPA Air Quality System (2021–2023). Grade based on 3-year average median AQI. Learn about AQI →
| PROJECT | AMOUNT | STATUS |
|---|---|---|
|
Proposed Data Center (Undisclosed Location)
Unknown
|
$500M | Proposed |
|
Lamberton Road Battery
Unknown
|
$170M | Planned |
|
Amazon Fulfillment Center (EWR4)
Amazon
|
$100M | Operating |
|
McGraw-Hill Companies Solar Farm (East Windsor)
NJR Clean Energy Ventures (for McGraw-Hill)
|
$60M | Operating |
|
Community Solar Portfolio (Multiple Projects)
Various (e.g., NJR Clean Energy Ventures Corporation)
|
$50M | Operating |
Source: public records, news, corporate announcements. Amounts are estimates where noted.
Bars show percentile rank among all 996 counties.
At 30/100, Mercer County faces headwinds that place it in the lower third of the 996 counties we track. Median income of $92,697 combined with job growth of +0.9% suggests the local economy is struggling to keep pace with national trends.
Housing in Mercer County is roughly in line with national affordability norms. The median home costs $327,600 and the income-to-home-value ratio sits at 0.28, with rents averaging $1,454/month. Not a bargain, but not a stretch for most local earners either.
Population and employment in Mercer County are both close to flat — population -0.3% YoY and jobs +0.9%. Home values shifted +0.4% over the past 12 months. A steady-state county, neither expanding quickly nor shrinking.
There's a moderate stream of newcomers. About 3.75% of residents moved from another state, which is above average and suggests Mercer County has appeal as a relocation destination — though it's not among the highest-inflow counties nationally.