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Where 61104 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 61104 into a pocket calculator and turn it upside down: hOIIg — not quite a word, sorry.
- ➕ As a number, 61,104 = 2 × 2 × 2 × 2 × 3 × 19 × 67. Its digits add up to 12, a total 940 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110111010110000 - 🏠 Its numerical neighbours: 61103 (Rockford, IL, 6 mi away) and 61105 (Rockford, IL, 2 mi away).
- 🔄 Backwards, 61104 becomes 40116, which is not a ZIP code at all.
- 👥 30 other ZIP codes are made of exactly the same digits (01614, 04116, 04611, 06114, 06141, 06411, …). The farthest-flung twin is 04611 in Beals, ME, 1,086 miles away.
- 🧭 Farther north than 77% of all ZIP codes, and farther west than 53%.
- 🎯522 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 61104 and you would come out at 42.25°S, 90.92°E — 1,106 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 16m of daylight. Shortest: 9h 05m.
- 📏 At 4.5 square miles of land, 61104 is bigger than 18% of ZIP codes — room for about 3.4 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 17,222This ZIP17,222 |
|---|---|
| Households | 7,672This ZIP7,672 |
| Housing units | 9,101This ZIP9,101 |
| Median age | 34.4This ZIP34.4Illinois39.0US 38.9 |
| Median household income | $33,772This ZIP$33,772Illinois$83,390US $80,734 |
| Median home value | $90,100This ZIP$90,100Illinois$263,300US $332,700 |
| Median gross rent | $887This ZIP$887Illinois$1,274US $1,413 |
| Bachelor's degree or higher | 9.3%This ZIP9.3% |
| Mean commute | 23.9 minThis ZIP23.9 min |
| Population density | 3,827.1 / sq miThis ZIP3,827.1 / sq mi |
Business and tax activity
| Business establishments | 417This ZIP417 |
|---|---|
| Employees | 9,357This ZIP9,357 |
| Annual payroll | $649,385,000This ZIP$649,385,000 |
| Tax returns filed | 6,560This ZIP6,560 |
| Total adjusted gross income | $216,800,000This ZIP$216,800,000 |
Land area
| Land area | 4.50 sq miThis ZIP4.50 sq mi |
|---|---|
| Water area | 0.08 sq miThis ZIP0.08 sq mi |
Other place names in 61104
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 61104
| ZIP | City | Distance |
|---|---|---|
61105 | Rockford, IL | 1.5 mi |
61108 | Rockford, IL | 4.0 mi |
61109 | Rockford, IL | 4.4 mi |
61102 | Rockford, IL | 4.5 mi |
61107 | Rockford, IL | 4.6 mi |
61112 | Rockford, IL | 5.4 mi |
61114 | Rockford, IL | 5.9 mi |
61103 | Rockford, IL | 6.2 mi |
61106 | Rockford, IL | 6.9 mi |
61110 | Rockford, IL | 6.9 mi |
Find every ZIP code within 10 miles of 61104 →
Questions about this ZIP code
Where is ZIP code 61104?
61104 is in Rockford, Illinois, in Winnebago County, part of the Rockford, IL metropolitan area. Its published point location is 42.2517, -89.0799.
What county is 61104 in?
61104 lies in Winnebago County.
What area code is 61104?
Rockford uses area codes 815 and 779, from NANPA's telephone records.
What time zone is 61104 in?
61104 uses America/Chicago.
How many people live in 61104?
About 17,222 people live in ZIP code 61104, in 7,672 households, at 3,827.1 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 61104?
$33,772 a year, against $83,390 across Illinois.
What ZIP codes are near 61104?
The closest are 61105 (1.5 mi), 61108 (4 mi), 61109 (4.4 mi), 61102 (4.5 mi) and 61107 (4.6 mi).
Is 61104 a PO Box ZIP code?
61104 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “61104 ZIP Code — Rockford, Illinois (Winnebago County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61104
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/61104.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.