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/MASON-CITY

Mason City ZIP codes, Iowa

Mason City, IA has 2 ZIP codes (50401 and 50402) and area code 641. The largest is 50401.

USPS city name
2 ZIP codes
Population
27,050
Area code
641
State
Iowa

Mason City in numbers

About 27,050 people live in Mason City, in 12,698 households, the 18th-largest of Iowa's 1,017 census places. The median household income is $64,804 a year, 14% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $142,000 (32% below the Iowa median), and median gross rent is $882 a month. The median age is 42.5; 20.8% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 14 minutes.

Population27,050Mason City27,050
Households12,698Mason City12,698
Median age42.5Mason City42.5Iowa38.6US 38.9
Median household income$64,804Mason City$64,804Iowa$75,059US $80,734
Median home value$142,000Mason City$142,000Iowa$208,000US $332,700
Median gross rent$882Mason City$882Iowa$972US $1,413
Bachelor's degree or higher20.8%Mason City20.8%Iowa31.4%US 35.7%
Mean commute13.5 minMason City13.5 minIowa19.8 minUS 26.4 min
Population density959 / sq miMason City959 / sq mi

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

ZIP codes addressed as Mason City

ZIP codes with the USPS city name Mason City
ZIP City Type Population Median income Median home
50401 Mason City , IA Standard 28,703 $66,072 $146,500
50402 Mason City , IA No street area — — —

Map of Mason City ZIP codes

5040150402

The ZIP codes of Mason City, 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 Mason City

The nearest larger towns are Cedar Falls (40,888 people, 58 mi), Waterloo (67,008 people, 62 mi) and Rochester, MN (122,330 people, 70 mi).

Towns near Mason City
TownPopulationDistance
Clear Lake 7,607 8.8 mi
Garner 3,049 20.6 mi
Osage 3,561 21.7 mi
Forest City 4,290 23.2 mi
Charles City 7,232 27.1 mi
Hampton 4,306 28.0 mi
Belmond 2,694 29.3 mi

More nearby: every ZIP code in Cerro Gordo County · Iowa ZIP codes

Cite this page

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

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