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Where 61101 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 61101 into a pocket calculator and turn it upside down: IOIIg — not quite a word, sorry.
- ➕ As a number, 61,101 = 3 × 3 × 3 × 31 × 73. Its digits add up to 9, a total 375 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1110111010101101 - 🏠 Its numerical neighbours: 61091 (Woosung, IL, 37 mi away) and 61102 (Rockford, IL, 8 mi away).
- 🔄 Backwards, 61101 becomes 10116 — and that is a real ZIP code: New York, NY, 791 miles away.
- 👥 11 other ZIP codes are made of exactly the same digits (01116, 01611, 06111, 10116, 10161, 11106, …). The farthest-flung twin is 01611 in Cherry Valley, MA, 881 miles away.
- 🧭 Farther north than 78% of all ZIP codes, and farther west than 54%.
- 🎯521 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 61101 and you would come out at 42.35°S, 90.85°E — 1,100 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 41.5 square miles of land, 61101 is bigger than 54% of ZIP codes — room for about 32 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 19,318This ZIP19,318 |
|---|---|
| Households | 7,750This ZIP7,750 |
| Housing units | 8,714This ZIP8,714 |
| Median age | 37.7This ZIP37.7Illinois39.0US 38.9 |
| Median household income | $46,163This ZIP$46,163Illinois$83,390US $80,734 |
| Median home value | $90,600This ZIP$90,600Illinois$263,300US $332,700 |
| Median gross rent | $1,037This ZIP$1,037Illinois$1,274US $1,413 |
| Bachelor's degree or higher | 16.6%This ZIP16.6% |
| Mean commute | 21.5 minThis ZIP21.5 min |
| Population density | 465.2 / sq miThis ZIP465.2 / sq mi |
Business and tax activity
| Business establishments | 321This ZIP321 |
|---|---|
| Employees | 4,056This ZIP4,056 |
| Annual payroll | $199,475,000This ZIP$199,475,000 |
| Tax returns filed | 8,310This ZIP8,310 |
| Total adjusted gross income | $373,338,000This ZIP$373,338,000 |
Land area
| Land area | 41.52 sq miThis ZIP41.52 sq mi |
|---|---|
| Water area | 0.07 sq miThis ZIP0.07 sq mi |
Other place names in 61101
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 61101
| ZIP | City | Distance |
|---|---|---|
61106 | Rockford, IL | 1.9 mi |
61110 | Rockford, IL | 1.9 mi |
61125 | Rockford, IL | 1.9 mi |
61126 | Rockford, IL | 1.9 mi |
61130 | Loves Park, IL | 1.9 mi |
61131 | Loves Park, IL | 1.9 mi |
61132 | Loves Park, IL | 1.9 mi |
61103 | Rockford, IL | 3.0 mi |
61105 | Rockford, IL | 5.8 mi |
61115 | Machesney Park, IL | 6.3 mi |
Find every ZIP code within 10 miles of 61101 →
Questions about this ZIP code
Where is ZIP code 61101?
61101 is in Rockford, Illinois, in Winnebago County, part of the Rockford, IL metropolitan area. Its published point location is 42.3461, -89.1461.
What county is 61101 in?
61101 lies in Winnebago County.
What area code is 61101?
Rockford uses area codes 815 and 779, from NANPA's telephone records.
What time zone is 61101 in?
61101 uses America/Chicago.
How many people live in 61101?
About 19,318 people live in ZIP code 61101, in 7,750 households, at 465.2 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 61101?
$46,163 a year, against $83,390 across Illinois.
What ZIP codes are near 61101?
The closest are 61106 (1.9 mi), 61110 (1.9 mi), 61125 (1.9 mi), 61126 (1.9 mi) and 61130 (1.9 mi).
Is 61101 a PO Box ZIP code?
61101 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “61101 ZIP Code — Rockford, Illinois (Winnebago County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61101
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/61101.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.