ZIP Code 61603 — Peoria, IL
61603 is a standard (street delivery) ZIP code serving Peoria, Illinois, in Peoria County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 61603 at a glance
| ZIP code | 61603 |
|---|---|
| Primary city | Peoria |
| State | Illinois (IL) |
| County | Peoria FIPS 17143 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 15,356 |
| Coordinates | 40.712200, -89.574650 |
How ZIP+4 works in 61603
The four digits after the hyphen encode a delivery segment inside 61603. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 61603 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Other ZIP codes in Peoria
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 61603.
| ZIP | City | Distance |
|---|---|---|
| 61606 | Peoria, IL | 2.1 mi |
| 61611 | East Peoria, IL | 2.1 mi |
| 61625 | Peoria, IL | 2.3 mi |
| 61616 | Peoria Heights, IL | 2.4 mi |
| 61602 | Peoria, IL | 2.7 mi |
| 61614 | Peoria, IL | 3.6 mi |
| 61605 | Peoria, IL | 3.9 mi |
| 61604 | Peoria, IL | 4.1 mi |
| 61610 | Creve Coeur, IL | 4.9 mi |
| 61615 | Peoria, IL | 5.6 mi |
| 61552 | Mossville, IL | 7.5 mi |
| 61571 | Washington, IL | 7.9 mi |
Questions about 61603
What is the ZIP+4 code for 61603?
61603 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 61603, you need to look up a specific street address to get them.
What city is 61603?
61603 is assigned to Peoria, Illinois, in Peoria County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.