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/CHARTER-OAK

Charter Oak ZIP code, Iowa

The ZIP code for Charter Oak, IA is 51439, and its area code is 712.

USPS city name
1 ZIP code
Population
580
Area code
712
State
Iowa

Charter Oak in numbers

About 580 people live in Charter Oak, in 237 households. The median household income is $53,042 a year, 29% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $77,700 (63% below the Iowa median), and median gross rent is $1,050 a month. The median age is 43.4; 7.6% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 22 minutes.

Population580Charter Oak580
Households237Charter Oak237
Median age43.4Charter Oak43.4Iowa38.6US 38.9
Median household income$53,042Charter Oak$53,042Iowa$75,059US $80,734
Median home value$77,700Charter Oak$77,700Iowa$208,000US $332,700
Median gross rent$1,050Charter Oak$1,050Iowa$972US $1,413
Bachelor's degree or higher7.6%Charter Oak7.6%Iowa31.4%US 35.7%
Mean commute22.4 minCharter Oak22.4 minIowa19.8 minUS 26.4 min
Population density1,131 / sq miCharter Oak1,131 / sq mi

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

ZIP codes addressed as Charter Oak

ZIP codes with the USPS city name Charter Oak
ZIP City Type Population Median income Median home
51439 Charter Oak , IA Standard 818 $52,941 $87,900

Map of Charter Oak ZIP codes

51439

The ZIP codes of Charter Oak, 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 Charter Oak

The nearest larger towns are Schleswig (831 people, 10 mi), Mapleton (989 people, 12 mi) and Denison (8,260 people, 13 mi).

Towns near Charter Oak
TownPopulationDistance
Denison 8,260 12.7 mi
Onawa 2,839 25.9 mi

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

Cite this page

zipcodes.pro. “Charter Oak, IA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ia/charter-oak

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