Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/NY/RIVERSIDE-2

Riverside ZIP codes, New York

No ZIP code is named for Riverside, NY; addresses there use a neighbouring town's name. The ZIP code covering it is 11901. Its area codes are 631 and 934.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
4,038
Area codes
631, 934

NANPA lists no telephone rate centre for Riverside itself, so these are the area codes of the nearest one, Riverhead (0.0 miles). A town on an area-code boundary can differ from its neighbour.

Riverside in numbers

About 4,038 people live in Riverside, in 1,086 households. The median household income is $59,318 a year, 31% below the New York median of $85,974 (US: $80,734). Median gross rent is $2,846 a month. The median age is 34.3; 32.9% of adults 25 and over hold a bachelor's degree or higher (40.2% across New York); the average commute takes 35 minutes.

Population4,038Riverside4,038
Households1,086Riverside1,086
Median age34.3Riverside34.3New York39.8US 38.9
Median household income$59,318Riverside$59,318New York$85,974US $80,734
Median gross rent$2,846Riverside$2,846New York$1,621US $1,413
Bachelor's degree or higher32.9%Riverside32.9%New York40.2%US 35.7%
Mean commute35.0 minRiverside35.0 minNew York32.6 minUS 26.4 min
Population density1,526 / sq miRiverside1,526 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Riverside CDP. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes covering Riverside

These ZIP codes cover part of Riverside but are addressed as somewhere else.

ZIP codes overlapping Riverside
ZIP City Type Population Median income Median home
11901 Riverhead , NY Standard 33,091 $85,061 $453,800

Map of Riverside ZIP codes

11901

The ZIP codes of Riverside, NY, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Riverside

The nearest larger towns are Riverhead (14,936 people, 3.2 mi), Flanders (6,609 people, 3.7 mi) and Calverton (5,618 people, 5.4 mi).

Towns near Riverside
TownPopulationDistance
Riverhead 14,936 3.2 mi
Flanders 6,609 3.7 mi
Westhampton 3,900 4.1 mi
Calverton 5,618 5.4 mi
Baiting Hollow 2,614 5.5 mi
East Quogue 5,406 6.5 mi
Manorville 14,233 6.7 mi
Westhampton Beach 2,574 6.9 mi
East Moriches 6,260 8.0 mi
Wading River 8,359 8.2 mi
Hampton Bays 15,706 8.5 mi
Mattituck 4,606 9.7 mi
Center Moriches 9,127 9.8 mi
East Shoreham 7,321 11.1 mi

More nearby: every ZIP code in Suffolk County · New York ZIP codes

Cite this page

zipcodes.pro. “Riverside, NY ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ny/riverside-2

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