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/WATERLOO

Waterloo ZIP code, Illinois

The ZIP code for Waterloo, IL is 62298, and its area code is 618.

USPS city name
1 ZIP code
Population
11,129
Area code
618

Waterloo in numbers

About 11,129 people live in Waterloo, in 4,491 households. The median household income is $98,711 a year, 18% above the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $249,500 (5% below the Illinois median), and median gross rent is $886 a month. The median age is 41.5; 37.3% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 27 minutes.

Population11,129Waterloo11,129
Households4,491Waterloo4,491
Median age41.5Waterloo41.5Illinois39.0US 38.9
Median household income$98,711Waterloo$98,711Illinois$83,390US $80,734
Median home value$249,500Waterloo$249,500Illinois$263,300US $332,700
Median gross rent$886Waterloo$886Illinois$1,274US $1,413
Bachelor's degree or higher37.3%Waterloo37.3%Illinois37.8%US 35.7%
Mean commute26.8 minWaterloo26.8 minIllinois27.8 minUS 26.4 min
Population density1,343 / sq miWaterloo1,343 / sq mi

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

ZIP codes addressed as Waterloo

ZIP codes with the USPS city name Waterloo
ZIP City Type Population Median income Median home
62298 Waterloo , IL Standard 18,208 $101,155 $290,200

Map of Waterloo ZIP codes

62298

The ZIP codes of Waterloo, 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 Waterloo

The nearest larger towns are Oakville, MO (35,333 people, 12 mi), Arnold, MO (20,956 people, 13 mi) and Mehlville, MO (29,805 people, 14 mi).

Towns near Waterloo
TownPopulationDistance
Columbia 11,127 8.8 mi
Millstadt 4,008 8.8 mi
Smithton 3,680 10.2 mi
Oakville, MO 35,333 11.7 mi
Red Bud 3,782 12.3 mi
Imperial, MO 5,488 12.5 mi
Dupo 3,879 12.6 mi
Arnold, MO 20,956 13.1 mi
Barnhart, MO 5,785 13.6 mi
Pevely, MO 6,055 13.9 mi
Mehlville, MO 29,805 14.2 mi
Herculaneum, MO 5,071 14.3 mi
Freeburg 4,592 14.5 mi
Crystal City, MO 4,718 14.9 mi

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

Cite this page

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

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