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/IA/UNION

Union ZIP code, Iowa

The ZIP code for Union, IA is 50258, and its area code is 641.

USPS city name
1 ZIP code
Population
378
Area code
641
State
Iowa

Union in numbers

About 378 people live in Union, in 197 households. The median household income is $55,625 a year, 26% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $74,600 (64% below the Iowa median), and median gross rent is $875 a month. The median age is 51.1; 18.0% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 22 minutes.

Population378Union378
Households197Union197
Median age51.1Union51.1Iowa38.6US 38.9
Median household income$55,625Union$55,625Iowa$75,059US $80,734
Median home value$74,600Union$74,600Iowa$208,000US $332,700
Median gross rent$875Union$875Iowa$972US $1,413
Bachelor's degree or higher18.0%Union18.0%Iowa31.4%US 35.7%
Mean commute22.2 minUnion22.2 minIowa19.8 minUS 26.4 min
Population density662 / sq miUnion662 / sq mi

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

ZIP codes addressed as Union

ZIP codes with the USPS city name Union
ZIP City Type Population Median income Median home
50258 Union , IA Standard 958 $83,988 $109,800

Map of Union ZIP codes

50258

The ZIP codes of Union, IA, 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 Union

The nearest larger towns are Eldora (2,617 people, 8.3 mi), Conrad (1,191 people, 9.7 mi) and Albion (622 people, 9.8 mi).

Towns near Union
TownPopulationDistance
Eldora 2,617 8.3 mi
Marshalltown 27,626 16.5 mi
Grundy Center 2,809 16.9 mi
Iowa Falls 5,038 21.7 mi
Nevada 6,983 26.1 mi
Story City 3,398 27.1 mi

More nearby: every ZIP code in Hardin County · Iowa ZIP codes

Cite this page

zipcodes.pro. “Union, IA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ia/union

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