Rocky Hill is a borough in Somerset County, New Jersey, home to about 819 people across 0.6 square miles. Its ZIP code is 08553.
Homes sold for a median of $348 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Rocky Hill. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Rocky Hill’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Newark Liberty International Airport (EWR)32 miles away |
|---|---|
| Closer regional airport | Trenton Mercer Airport (TTN)13 miles away |
| Nearest city of 250,000+ | Newark, NJ33 miles away |
| Nearest city of 1 million+ | Philadelphia, PA38 miles away |
Straight-line distances from the center of Rocky Hill; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Rocky Hill had 743 residents in the 2020 census, up 12% since 2000.
It’s the 543rd largest of 565 towns in New Jersey by population.
Somerset County grew from 32,948 residents in 1900 to 345,361 in 2020.
Somerset County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 22°F. About 51.1 inches of rain and melted snow fall in a typical year, with about 24 inches of snow.
Source: NOAA 1991–2020 climate normals, Wertsville 4 Ne, NJ weather station (8 miles away).
188,127 jobs at 9,831 businesses in Somerset County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
5 doctors and other health care providers list an office in Rocky Hill.
Nearest hospitals
Providers with an office here
| Dentists | 1 |
|---|---|
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 3 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Grocery stores (2 nearby)
Libraries (1 nearby)
Museums
Theaters and performance venues
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.