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Where 61103 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 61103 into a pocket calculator and turn it upside down: EOIIg — not quite a word, sorry.
- ➕ As a number, 61,103 = 7 × 7 × 29 × 43. Its digits add up to 11, a total 714 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110111010101111 - 🏠 Its numerical neighbours: 61102 (Rockford, IL, 9 mi away) and 61104 (Rockford, IL, 6 mi away).
- 🔄 Backwards, 61103 becomes 30116 — and that is a real ZIP code: Carrollton, GA, 648 miles away.
- 👥 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, 882 miles away.
- 🧭 Farther north than 78% of all ZIP codes, and farther west than 53%.
- 🎯524 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 61103 and you would come out at 42.34°S, 90.91°E — 1,103 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 17m of daylight. Shortest: 9h 04m.
- 📏 At 16.3 square miles of land, 61103 is bigger than 34% of ZIP codes — room for about 12 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 22,869This ZIP22,869 |
|---|---|
| Households | 9,866This ZIP9,866 |
| Housing units | 11,032This ZIP11,032 |
| Median age | 40.5This ZIP40.5Illinois39.0US 38.9 |
| Median household income | $51,161This ZIP$51,161Illinois$83,390US $80,734 |
| Median home value | $115,500This ZIP$115,500Illinois$263,300US $332,700 |
| Median gross rent | $934This ZIP$934Illinois$1,274US $1,413 |
| Bachelor's degree or higher | 19.7%This ZIP19.7% |
| Mean commute | 22.1 minThis ZIP22.1 min |
| Population density | 1,399.9 / sq miThis ZIP1,399.9 / sq mi |
Business and tax activity
| Business establishments | 327This ZIP327 |
|---|---|
| Employees | 6,502This ZIP6,502 |
| Annual payroll | $390,017,000This ZIP$390,017,000 |
| Tax returns filed | 10,270This ZIP10,270 |
| Total adjusted gross income | $543,763,000This ZIP$543,763,000 |
Land area
| Land area | 16.34 sq miThis ZIP16.34 sq mi |
|---|---|
| Water area | 0.53 sq miThis ZIP0.53 sq mi |
Other place names in 61103
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 61103
| ZIP | City | Distance |
|---|---|---|
61101 | Rockford, IL | 3.0 mi |
61115 | Machesney Park, IL | 3.6 mi |
61111 | Loves Park, IL | 4.3 mi |
61106 | Rockford, IL | 4.4 mi |
61110 | Rockford, IL | 4.4 mi |
61125 | Rockford, IL | 4.4 mi |
61126 | Rockford, IL | 4.4 mi |
61130 | Loves Park, IL | 4.4 mi |
61131 | Loves Park, IL | 4.4 mi |
61132 | Loves Park, IL | 4.4 mi |
Find every ZIP code within 10 miles of 61103 →
Questions about this ZIP code
Where is ZIP code 61103?
61103 is in Rockford, Illinois, in Winnebago County, part of the Rockford, IL metropolitan area. Its published point location is 42.3409, -89.0875.
What county is 61103 in?
61103 lies in Winnebago County.
What area code is 61103?
Rockford uses area codes 815 and 779, from NANPA's telephone records.
What time zone is 61103 in?
61103 uses America/Chicago.
How many people live in 61103?
About 22,869 people live in ZIP code 61103, in 9,866 households, at 1,399.9 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 61103?
$51,161 a year, against $83,390 across Illinois.
What ZIP codes are near 61103?
The closest are 61101 (3 mi), 61115 (3.6 mi), 61111 (4.3 mi), 61106 (4.4 mi) and 61110 (4.4 mi).
Is 61103 a PO Box ZIP code?
61103 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “61103 ZIP Code — Rockford, Illinois (Winnebago County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61103
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/61103.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.