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/ME/SMITHFIELD

Smithfield ZIP code, Maine

The ZIP code for Smithfield, ME is 04978, and its area code is 207.

USPS city name
1 ZIP code
Population
856
Area code
207
State
Maine

Smithfield in numbers

About 856 people live in Smithfield, in 413 households. The median household income is $107,917 a year, 44% above the Maine median of $74,733 (US: $80,734). The median owner-occupied home is valued at $242,800 (18% below the Maine median).

Population856Smithfield856
Households413Smithfield413
Median household income$107,917Smithfield$107,917Maine$74,733US $80,734
Median home value$242,800Smithfield$242,800Maine$296,600US $332,700

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the ZIP code addressed as Smithfield. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Smithfield

ZIP codes with the USPS city name Smithfield
ZIP City Type Population Median income Median home
04978 Smithfield , ME Standard 856 $107,917 $242,800

Map of Smithfield ZIP codes

04978

The ZIP codes of Smithfield, ME, 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 Smithfield

The nearest larger towns are Norridgewock (1,378 people, 5.9 mi), Oakland (2,710 people, 7.7 mi) and Waterville (17,077 people, 9.5 mi).

Towns near Smithfield
TownPopulationDistance
Oakland 2,710 7.7 mi
Waterville 17,077 9.5 mi
Skowhegan 6,662 10.4 mi
Winslow 5,873 11.2 mi
Madison 2,676 11.7 mi
Farmington 4,705 17.0 mi
Augusta 19,077 21.5 mi
Pittsfield 3,084 22.6 mi
Winthrop 3,108 23.2 mi
Hallowell 2,592 24.5 mi

More nearby: every ZIP code in Somerset County · Maine ZIP codes

Cite this page

zipcodes.pro. “Smithfield, ME ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/me/smithfield

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