Riverside is a borough in Northumberland County, Pennsylvania, home to about 1,806 people across 4.9 square miles. Its ZIP code is 17868, and parts of 17821 are in Riverside too.
Homes sold for a median of $164 per square foot in the three months ending August 2026, a seller’s market.
All in Riverside
Part is in Riverside, part in Mahoning Township (Montour County) and Danville
Each card is that ZIP code’s whole market, including any part outside Riverside. 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)105 miles away |
|---|---|
| Closer regional airport | Williamsport Regional Airport (IPT)24 miles away |
| Nearest city of 250,000+ | Philadelphia, PA103 miles away |
Straight-line distances from the center of Riverside; 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.
Riverside had 2,040 residents in the 2020 census, up 10% since 2000.
It’s the 1291st largest of 2,568 towns in Pennsylvania by population.
Northumberland County grew from 90,911 residents in 1900 to 91,647 in 2020.
Northumberland 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 19°F. About 43.6 inches of rain and melted snow fall in a typical year, with about 29 inches of snow.
Source: NOAA 1991–2020 climate normals, Sunbury, PA weather station (12 miles away).
23,047 jobs at 1,611 businesses in Northumberland 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 Riverside.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 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 (12 nearby)
Grocery stores (2 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums (2 nearby)
Counts are within about 1.5 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.
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Shares ZIP codes with Mahoning Township (Montour County), Danville, Valley Township (Montour County), Rush Township (Northumberland County), Liberty Township (Montour County), Derry Township (Montour County), Cooper Township (Montour County), Anthony Township (Montour County), West Hemlock, Limestone Township (Montour County) and Mayberry.
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.