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Where 61603 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 61603 into a pocket calculator and turn it upside down: EOgIg — not quite a word, sorry.
- ➕ 61603 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 16, a total 1,922 other ZIP codes share.
- 💾In binary, the way a computer stores it:
1111000010100011 - 🏠 Its numerical neighbours: 61602 (Peoria, IL, 3 mi away) and 61604 (Peoria, IL, 4 mi away).
- 🔄 Backwards, 61603 becomes 30616, which is not a ZIP code at all.
- 👥 32 other ZIP codes are made of exactly the same digits (01366, 13066, 13606, 13660, 16036, 16063, …). The farthest-flung twin is 01366 in Petersham, MA, 905 miles away.
- 🧭 Farther north than 63% of all ZIP codes, and farther west than 55%.
- 🎯478 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 61603 and you would come out at 40.71°S, 90.42°E — 1,148 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 15h 06m of daylight. Shortest: 9h 15m.
- 📏 At 4.2 square miles of land, 61603 is bigger than 17% of ZIP codes — room for about 3.2 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 15,356This ZIP15,356 |
|---|---|
| Households | 6,674This ZIP6,674 |
| Housing units | 8,088This ZIP8,088 |
| Median age | 34.1This ZIP34.1Illinois39.0US 38.9 |
| Median household income | $41,618This ZIP$41,618Illinois$83,390US $80,734 |
| Median home value | $77,500This ZIP$77,500Illinois$263,300US $332,700 |
| Median gross rent | $995This ZIP$995Illinois$1,274US $1,413 |
| Bachelor's degree or higher | 14.7%This ZIP14.7% |
| Mean commute | 17.5 minThis ZIP17.5 min |
| Population density | 3,634.6 / sq miThis ZIP3,634.6 / sq mi |
Business and tax activity
| Business establishments | 272This ZIP272 |
|---|---|
| Employees | 4,426This ZIP4,426 |
| Annual payroll | $207,657,000This ZIP$207,657,000 |
| Tax returns filed | 6,400This ZIP6,400 |
| Total adjusted gross income | $246,053,000This ZIP$246,053,000 |
Land area
| Land area | 4.23 sq miThis ZIP4.23 sq mi |
|---|---|
| Water area | 0.97 sq miThis ZIP0.97 sq mi |
Other place names in 61603
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 61603
| ZIP | City | Distance |
|---|---|---|
61639 | Peoria, IL | 0.6 mi |
61637 | Peoria, IL | 0.9 mi |
61636 | Peoria, IL | 1.2 mi |
61601 | Peoria, IL | 1.4 mi |
61629 | Peoria, IL | 1.4 mi |
61634 | Peoria, IL | 1.7 mi |
61606 | Peoria, IL | 2.0 mi |
61633 | Peoria, IL | 2.1 mi |
61611 | East Peoria, IL | 2.1 mi |
61625 | Peoria, IL | 2.2 mi |
Find every ZIP code within 10 miles of 61603 →
Questions about this ZIP code
Where is ZIP code 61603?
61603 is in Peoria, Illinois, in Peoria County, part of the Peoria, IL metropolitan area. Its published point location is 40.7098, -89.5755.
What county is 61603 in?
61603 lies in Peoria County.
What area code is 61603?
Peoria uses area codes 309 and 861, from NANPA's telephone records.
What time zone is 61603 in?
61603 uses America/Chicago.
How many people live in 61603?
About 15,356 people live in ZIP code 61603, in 6,674 households, at 3,634.6 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 61603?
$41,618 a year, against $83,390 across Illinois.
What ZIP codes are near 61603?
The closest are 61639 (0.6 mi), 61637 (0.9 mi), 61636 (1.2 mi), 61601 (1.4 mi) and 61629 (1.4 mi).
Is 61603 a PO Box ZIP code?
61603 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “61603 ZIP Code — Peoria, Illinois (Peoria County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/61603
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/61603.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.