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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/ID/CHESTER

Chester ZIP code, Idaho

The ZIP code for Chester, ID is 83421, and its area codes are 208 and 986.

USPS city name
1 ZIP code
Population
220
Area codes
208, 986
State
Idaho

NANPA lists no telephone rate centre for Chester itself, so these are the area codes of the nearest one, Saint Anthony (10.1 miles). A town on an area-code boundary can differ from its neighbour.

Chester in numbers

About 220 people live in Chester, in 115 households. The median owner-occupied home is valued at $282,400 (33% below the Idaho median).

Population220Chester220
Households115Chester115
Median home value$282,400Chester$282,400Idaho$418,600US $332,700

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

ZIP codes addressed as Chester

ZIP codes with the USPS city name Chester
ZIP City Type Population Median income Median home
83421 Chester , ID Standard 220 — $282,400

Map of Chester ZIP codes

83421

The ZIP codes of Chester, ID, 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 Chester

The nearest larger towns are Ashton (1,417 people, 7.0 mi), St. Anthony (3,911 people, 7.3 mi) and Newdale (525 people, 8.5 mi).

Towns near Chester
TownPopulationDistance
St. Anthony 3,911 7.3 mi
Rexburg 40,543 17.3 mi
Driggs 2,925 29.0 mi
Rigby 5,404 29.1 mi

More nearby: every ZIP code in Fremont County · Idaho ZIP codes

Cite this page

zipcodes.pro. “Chester, ID ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/id/chester

Underlying data is public domain or openly licensed — sources, vintages and licences.