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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/MT/SIDNEY

Sidney ZIP code, Montana

The ZIP code for Sidney, MT is 59270, and its area code is 406.

USPS city name
1 ZIP code
Population
6,171
Area code
406
State
Montana

Sidney in numbers

About 6,171 people live in Sidney, in 2,505 households, the 19th-largest of Montana's 475 census places. The median household income is $62,538 a year, 14% below the Montana median of $72,509 (US: $80,734). The median owner-occupied home is valued at $236,900 (37% below the Montana median), and median gross rent is $931 a month. The median age is 37.3; 22.0% of adults 25 and over hold a bachelor's degree or higher (35.2% across Montana); the average commute takes 21 minutes.

Population6,171Sidney6,171
Households2,505Sidney2,505
Median age37.3Sidney37.3Montana40.4US 38.9
Median household income$62,538Sidney$62,538Montana$72,509US $80,734
Median home value$236,900Sidney$236,900Montana$375,800US $332,700
Median gross rent$931Sidney$931Montana$1,081US $1,413
Bachelor's degree or higher22.0%Sidney22.0%Montana35.2%US 35.7%
Mean commute21.2 minSidney21.2 minMontana19.1 minUS 26.4 min
Population density1,877 / sq miSidney1,877 / sq mi

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

ZIP codes addressed as Sidney

ZIP codes with the USPS city name Sidney
ZIP City Type Population Median income Median home
59270 Sidney , MT Standard 8,571 $72,630 $267,600

Map of Sidney ZIP codes

59270

The ZIP codes of Sidney, MT, 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 Sidney

The nearest larger towns are Williston, ND (28,056 people, 41 mi) and Dickinson, ND (25,357 people, 86 mi).

More nearby: every ZIP code in Richland County · Montana ZIP codes

Cite this page

zipcodes.pro. “Sidney, MT ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/mt/sidney

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