ZIP Code 61350 — Ottawa, IL
61350 is a standard (street delivery) ZIP code serving Ottawa, Illinois, in LaSalle 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 61350 at a glance
| ZIP code | 61350 |
|---|---|
| Primary city | Ottawa |
| State | Illinois (IL) |
| County | LaSalle FIPS 17099 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 23,713 |
| Coordinates | 41.371520, -88.861570 |
How ZIP+4 works in 61350
The four digits after the hyphen encode a delivery segment inside 61350. 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 61350 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.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 61350.
| ZIP | City | Distance |
|---|---|---|
| 60557 | Wedron, IL | 7 mi |
| 61373 | Utica, IL | 7.2 mi |
| 61341 | Marseilles, IL | 9 mi |
| 61325 | Grand Ridge, IL | 9.7 mi |
| 60549 | Serena, IL | 10.3 mi |
| 61348 | Oglesby, IL | 11 mi |
| 61301 | La Salle, IL | 11.3 mi |
| 61371 | Triumph, IL | 12 mi |
| 61372 | Troy Grove, IL | 13.2 mi |
| 61360 | Seneca, IL | 13.5 mi |
| 60551 | Sheridan, IL | 13.8 mi |
| 61332 | Leonore, IL | 14.1 mi |
Questions about 61350
What is the ZIP+4 code for 61350?
61350 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 61350, you need to look up a specific street address to get them.
What city is 61350?
61350 is assigned to Ottawa, Illinois, in LaSalle 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.