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/DEFIANCE

Defiance ZIP code, Iowa

The ZIP code for Defiance, IA is 51527, and its area code is 712.

USPS city name
1 ZIP code
Population
251
Area code
712
State
Iowa

Defiance in numbers

About 251 people live in Defiance, in 119 households. The median household income is $53,542 a year, 29% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $101,600 (51% below the Iowa median), and median gross rent is $770 a month. The median age is 36.2; 11.4% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 19 minutes.

Population251Defiance251
Households119Defiance119
Median age36.2Defiance36.2Iowa38.6US 38.9
Median household income$53,542Defiance$53,542Iowa$75,059US $80,734
Median home value$101,600Defiance$101,600Iowa$208,000US $332,700
Median gross rent$770Defiance$770Iowa$972US $1,413
Bachelor's degree or higher11.4%Defiance11.4%Iowa31.4%US 35.7%
Mean commute18.7 minDefiance18.7 minIowa19.8 minUS 26.4 min
Population density673 / sq miDefiance673 / sq mi

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

ZIP codes addressed as Defiance

ZIP codes with the USPS city name Defiance
ZIP City Type Population Median income Median home
51527 Defiance , IA Standard 362 $64,750 $123,400

Map of Defiance ZIP codes

51527

The ZIP codes of Defiance, 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 Defiance

The nearest larger towns are Earling (478 people, 5.3 mi), Manilla (630 people, 7.2 mi) and Irwin (352 people, 7.3 mi).

Towns near Defiance
TownPopulationDistance
Harlan 4,891 12.1 mi
Denison 8,260 13.2 mi
Carroll 10,208 29.7 mi

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

Cite this page

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

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