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/KNOXVILLE

Knoxville ZIP code, Iowa

The ZIP code for Knoxville, IA is 50138, and its area code is 641.

USPS city name
1 ZIP code
Population
7,473
Area code
641
State
Iowa

Knoxville in numbers

About 7,473 people live in Knoxville, in 3,173 households. The median household income is $61,599 a year, 18% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $160,300 (23% below the Iowa median), and median gross rent is $801 a month. The median age is 42.2; 30.6% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 23 minutes.

Population7,473Knoxville7,473
Households3,173Knoxville3,173
Median age42.2Knoxville42.2Iowa38.6US 38.9
Median household income$61,599Knoxville$61,599Iowa$75,059US $80,734
Median home value$160,300Knoxville$160,300Iowa$208,000US $332,700
Median gross rent$801Knoxville$801Iowa$972US $1,413
Bachelor's degree or higher30.6%Knoxville30.6%Iowa31.4%US 35.7%
Mean commute23.0 minKnoxville23.0 minIowa19.8 minUS 26.4 min
Population density1,618 / sq miKnoxville1,618 / sq mi

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

ZIP codes addressed as Knoxville

ZIP codes with the USPS city name Knoxville
ZIP City Type Population Median income Median home
50138 Knoxville , IA Standard 11,117 $74,693 $196,700

Map of Knoxville ZIP codes

50138

The ZIP codes of Knoxville, 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 Knoxville

The nearest larger towns are Pella (10,720 people, 11 mi), Oskaloosa (11,504 people, 24 mi) and Indianola (16,044 people, 24 mi).

Towns near Knoxville
TownPopulationDistance
Pella 10,720 11.3 mi
Chariton 4,242 23.4 mi
Oskaloosa 11,504 24.0 mi
Indianola 16,044 24.2 mi
Carlisle 4,255 24.5 mi
Albia 3,663 25.5 mi
Newton 15,700 26.3 mi
Mitchellville 2,579 27.9 mi
Pleasant Hill 11,136 28.5 mi

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

Cite this page

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

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