Williamstown is a borough in Dauphin County, Pennsylvania, home to about 1,345 people across 0.3 square miles. Its ZIP code is 17098.
Homes sold for a median of $60 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Williamstown; also Williams Township
Each card is that ZIP code’s whole market, including any part outside Williamstown. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Philadelphia International Airport (PHL)88 miles away |
|---|---|
| Closer regional airport | Harrisburg International Airport (MDT)28 miles away |
| Nearest city of 250,000+ | Philadelphia, PA88 miles away |
Straight-line distances from the center of Williamstown; 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.
Williamstown had 1,303 residents in the 2020 census, down 9% since 2000.
It’s the 1529th largest of 2,568 towns in Pennsylvania by population.
Dauphin County grew from 114,443 residents in 1900 to 286,401 in 2020.
Dauphin County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 20°F. About 50.9 inches of rain and melted snow fall in a typical year, with about 28 inches of snow.
Source: NOAA 1991–2020 climate normals, Dehart Dam, PA weather station (11 miles away).
157,994 jobs at 6,951 businesses in Dauphin County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in Williamstown.
Nearest hospitals
Providers with an office here
| Dentists | 1 |
|---|---|
| Mental health providers | 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)
Pharmacies
Libraries
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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Shares ZIP codes with Williams Township.
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.