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/NH/PLAINFIELD

Plainfield ZIP code, New Hampshire

The ZIP code for Plainfield, NH is 03781, and its area code is 603.

USPS city name
1 ZIP code
Population
220
Area code
603

Plainfield in numbers

About 220 people live in Plainfield, in 74 households. The median household income is $109,500 a year, 11% above the New Hampshire median of $99,031 (US: $80,734). The median owner-occupied home is valued at $455,600 (13% above the New Hampshire median), and median gross rent is $1,600 a month. The median age is 31.8; 31.8% of adults 25 and over hold a bachelor's degree or higher (40.6% across New Hampshire); the average commute takes 31 minutes.

Population220Plainfield220
Households74Plainfield74
Median age31.8Plainfield31.8New Hampshire43.3US 38.9
Median household income$109,500Plainfield$109,500New Hampshire$99,031US $80,734
Median home value$455,600Plainfield$455,600New Hampshire$402,500US $332,700
Median gross rent$1,600Plainfield$1,600New Hampshire$1,491US $1,413
Bachelor's degree or higher31.8%Plainfield31.8%New Hampshire40.6%US 35.7%
Mean commute31.0 minPlainfield31.0 minNew Hampshire26.7 minUS 26.4 min
Population density381 / sq miPlainfield381 / sq mi

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

ZIP codes addressed as Plainfield

ZIP codes with the USPS city name Plainfield
ZIP City Type Population Median income Median home
03781 Plainfield , NH Standard 1,918 $109,659 $426,400

Map of Plainfield ZIP codes

03781

The ZIP codes of Plainfield, NH, 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 Plainfield

The nearest larger towns are Hartland, VT (572 people, 2.4 mi), Windsor, VT (2,060 people, 4.2 mi) and North Hartland, VT (322 people, 4.3 mi).

Towns near Plainfield
TownPopulationDistance
White River Junction, VT 3,364 8.1 mi
Lebanon 14,999 8.6 mi
Wilder, VT 3,087 10.0 mi
Claremont 13,078 10.3 mi
Hanover 8,479 12.9 mi
Newport 4,758 14.7 mi
Springfield, VT 4,237 17.6 mi
Bellows Falls, VT 2,891 28.1 mi

More nearby: every ZIP code in Sullivan County · New Hampshire ZIP codes

Cite this page

zipcodes.pro. “Plainfield, NH ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/nh/plainfield

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