61031
ZIP 61031 is Franklin Grove, Illinois, mostly in Lee County; area codes 815 and 779; Central time.
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Asking the National Weather Service…
Where 61031 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 61031 into a pocket calculator and turn it upside down: IEOIg — not quite a word, sorry.
- ➕ 61031 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110111001100111 - 🏠 Its numerical neighbours: 61030 (Forreston, IL, 24 mi away) and 61032 (Freeport, IL, 37 mi away).
- 🔄 Backwards, 61031 becomes 13016, which is not a ZIP code at all.
- 👥 28 other ZIP codes are made of exactly the same digits (01613, 06131, 10163, 11360, 13061, 13160, …). The farthest-flung twin is 01613 in Worcester, MA, 898 miles away.
- 🧭 Farther north than 74% of all ZIP codes, and farther west than 54%.
- 🎯503 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 61031 and you would come out at 41.83°S, 90.68°E — 1,112 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 13m of daylight. Shortest: 9h 08m.
- 📏 At 44.9 square miles of land, 61031 is bigger than 57% of ZIP codes — room for about 34 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,492This ZIP1,492 |
|---|---|
| Households | 607This ZIP607 |
| Housing units | 652This ZIP652 |
| Median age | 49.9This ZIP49.9Illinois39.0US 38.9 |
| Median household income | $75,446This ZIP$75,446Illinois$83,390US $80,734 |
| Median home value | $136,700This ZIP$136,700Illinois$263,300US $332,700 |
| Median gross rent | $823This ZIP$823Illinois$1,274US $1,413 |
| Bachelor's degree or higher | 28.2%This ZIP28.2% |
| Mean commute | 30.8 minThis ZIP30.8 min |
| Population density | 33.2 / sq miThis ZIP33.2 / sq mi |
Business and tax activity
| Business establishments | 19This ZIP19 |
|---|---|
| Employees | 247This ZIP247 |
| Annual payroll | $7,526,000This ZIP$7,526,000 |
| Tax returns filed | 680This ZIP680 |
| Total adjusted gross income | $46,317,000This ZIP$46,317,000 |
Land area
| Land area | 44.93 sq miThis ZIP44.93 sq mi |
|---|---|
| Water area | 0.02 sq miThis ZIP0.02 sq mi |
Counties 61031 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Lee County | 95.0% |
| Ogle County | 5.0% |
Other place names in 61031
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 61031
| ZIP | City | Distance |
|---|---|---|
61057 | Nachusa, IL | 3.2 mi |
61331 | Lee Center, IL | 6.1 mi |
61324 | Eldena, IL | 6.3 mi |
61006 | Ashton, IL | 6.5 mi |
61021 | Dixon, IL | 8.0 mi |
61310 | Amboy, IL | 9.0 mi |
61378 | West Brooklyn, IL | 11.3 mi |
61061 | Oregon, IL | 11.7 mi |
61091 | Woosung, IL | 13.1 mi |
61015 | Chana, IL | 13.2 mi |
Find every ZIP code within 10 miles of 61031 →
Questions about this ZIP code
Where is ZIP code 61031?
61031 is in Franklin Grove, Illinois, in Lee County, part of the Dixon, IL micropolitan area. Its published point location is 41.8300, -89.3213.
What county is 61031 in?
61031 spans 2 counties: Lee County and Ogle County. Most of it falls in Lee County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 61031?
Franklin Grove uses area codes 815 and 779, from NANPA's telephone records.
What time zone is 61031 in?
61031 uses America/Chicago.
How many people live in 61031?
About 1,492 people live in ZIP code 61031, in 607 households, at 33.2 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 61031?
$75,446 a year, against $83,390 across Illinois.
What ZIP codes are near 61031?
The closest are 61057 (3.2 mi), 61331 (6.1 mi), 61324 (6.3 mi), 61006 (6.5 mi) and 61021 (8 mi).
Is 61031 a PO Box ZIP code?
61031 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “61031 ZIP Code — Franklin Grove, Illinois (Lee County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61031
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/61031.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.