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/GRAND-DETOUR

Grand Detour ZIP codes, Illinois

No ZIP code is named for Grand Detour, IL; addresses there use a neighbouring town's name. The ZIP code covering it is 61021. Its area codes are 779 and 815.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
297
Area codes
779, 815

Grand Detour in numbers

About 297 people live in Grand Detour, in 148 households. The median household income is $76,406 a year, 8% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $191,700 (27% below the Illinois median). The median age is 51.6; 27.1% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 19 minutes.

Population297Grand Detour297
Households148Grand Detour148
Median age51.6Grand Detour51.6Illinois39.0US 38.9
Median household income$76,406Grand Detour$76,406Illinois$83,390US $80,734
Median home value$191,700Grand Detour$191,700Illinois$263,300US $332,700
Bachelor's degree or higher27.1%Grand Detour27.1%Illinois37.8%US 35.7%
Mean commute18.8 minGrand Detour18.8 minIllinois27.8 minUS 26.4 min
Population density254 / sq miGrand Detour254 / sq mi

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

ZIP codes covering Grand Detour

These ZIP codes cover part of Grand Detour but are addressed as somewhere else.

ZIP codes overlapping Grand Detour
ZIP City Type Population Median income Median home
61021 Dixon , IL Standard 22,308 $69,127 $148,500

Map of Grand Detour ZIP codes

61021

The ZIP codes of Grand Detour, 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 Grand Detour

The nearest larger towns are Lost Nation (714 people, 2.4 mi), Dixon (14,910 people, 5.2 mi) and Franklin Grove (988 people, 7.1 mi).

Towns near Grand Detour
TownPopulationDistance
Dixon 14,910 5.2 mi
Oregon 3,851 8.7 mi
Mount Morris 2,726 10.2 mi
Sterling 14,717 16.2 mi
Byron 3,743 17.0 mi
Rock Falls 8,587 17.0 mi
Rochelle 9,529 18.0 mi
Davis Junction 2,757 22.2 mi
Winnebago 2,981 26.9 mi
Mendota 6,994 28.7 mi
Morrison 3,739 29.0 mi
Freeport 23,505 29.1 mi

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

Cite this page

zipcodes.pro. “Grand Detour, IL ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/il/grand-detour

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