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/IL/MONMOUTH

Monmouth ZIP code, Illinois

The ZIP code for Monmouth, IL is 61462, and its area code is 309.

USPS city name
1 ZIP code
Population
8,581
Area code
309

Monmouth in numbers

About 8,581 people live in Monmouth, in 3,323 households. The median household income is $61,138 a year, 27% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $86,800 (67% below the Illinois median), and median gross rent is $733 a month. The median age is 34.1; 18.3% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 16 minutes.

Population8,581Monmouth8,581
Households3,323Monmouth3,323
Median age34.1Monmouth34.1Illinois39.0US 38.9
Median household income$61,138Monmouth$61,138Illinois$83,390US $80,734
Median home value$86,800Monmouth$86,800Illinois$263,300US $332,700
Median gross rent$733Monmouth$733Illinois$1,274US $1,413
Bachelor's degree or higher18.3%Monmouth18.3%Illinois37.8%US 35.7%
Mean commute15.5 minMonmouth15.5 minIllinois27.8 minUS 26.4 min
Population density2,022 / sq miMonmouth2,022 / sq mi

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

ZIP codes addressed as Monmouth

ZIP codes with the USPS city name Monmouth
ZIP City Type Population Median income Median home
61462 Monmouth , IL Standard 10,458 $64,113 $102,900

Map of Monmouth ZIP codes

61462

The ZIP codes of Monmouth, IL, 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 Monmouth

The nearest larger towns are Galesburg (29,481 people, 14 mi), Burlington, IA (23,728 people, 26 mi) and Macomb (14,894 people, 31 mi).

Towns near Monmouth
TownPopulationDistance
Galesburg 29,481 14.1 mi
Abingdon 3,443 14.8 mi
Knoxville 3,211 18.7 mi
Aledo 3,668 20.4 mi
Bushnell 2,677 26.1 mi
Burlington, IA 23,728 26.2 mi
West Burlington, IA 3,189 28.5 mi

More nearby: every ZIP code in Warren County · Illinois ZIP codes

Cite this page

zipcodes.pro. “Monmouth, IL ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/il/monmouth

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