Delaware is a township in Hunterdon County, New Jersey, home to about 4,577 people across 37 square miles. Its ZIP code is 08559, and parts of 08530 and 08822 are in Delaware too.
Homes sold for a median of $345 per square foot in the three months ending August 2026, a balanced market.
Mostly Delaware; also Kingwood and Stockton
Mostly Lambertville; part is in Delaware
Mostly Raritan Township; part is in Delaware
Each card is that ZIP code’s whole market, including any part outside Delaware. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Newark Liberty International Airport (EWR)43 miles away |
|---|---|
| Closer regional airport | Trenton Mercer Airport (TTN)14 miles away |
| Nearest city of 250,000+ | Philadelphia, PA32 miles away |
Straight-line distances from the center of Delaware; 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.
Delaware had 4,560 residents in the 2020 census, up 2% since 2000.
It’s the 395th largest of 565 towns in New Jersey by population.
Hunterdon County grew from 34,507 residents in 1900 to 128,947 in 2020.
Hunterdon County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 19°F. About 50.4 inches of rain and melted snow fall in a typical year, with about 13 inches of snow.
Source: NOAA 1991–2020 climate normals, Lambertville, NJ weather station (6 miles away).
45,700 jobs at 3,672 businesses in Hunterdon County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
10 doctors and other health care providers list an office in Delaware.
Nearest hospitals
Providers with an office here
| Primary care doctors | 2 |
|---|---|
| Nurse practitioners and physician assistants | 2 |
| Mental health providers | 5 |
| Physical and occupational therapists | 1 |
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 (4 nearby)
Grocery stores
Pharmacies
Libraries (2 nearby)
Museums
Theaters and performance venues
Counts are within about 4 miles 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.
Established in 1838.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
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Shares ZIP codes with Raritan Township, Readington, Flemington, Lambertville, West Amwell, Hopewell Township (Mercer County), Kingwood, Franklin Township (Hunterdon County), Stockton and East Amwell.
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.