ZIP Code 61770 — Saybrook, IL
61770 is a standard (street delivery) ZIP code serving Saybrook, Illinois, in McLean 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 61770 at a glance
| ZIP code | 61770 |
|---|---|
| Primary city | Saybrook |
| State | Illinois (IL) |
| County | McLean FIPS 17113 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 1,067 |
| Coordinates | 40.439650, -88.524570 |
How ZIP+4 works in 61770
The four digits after the hyphen encode a delivery segment inside 61770. 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 61770 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 61770.
| ZIP | City | Distance |
|---|---|---|
| 61722 | Arrowsmith, IL | 5.7 mi |
| 61724 | Bellflower, IL | 7.3 mi |
| 61720 | Anchor, IL | 7.8 mi |
| 61845 | Foosland, IL | 8 mi |
| 60936 | Gibson City, IL | 8.8 mi |
| 61728 | Colfax, IL | 10.8 mi |
| 61737 | Ellsworth, IL | 11 mi |
| 61843 | Fisher, IL | 11.4 mi |
| 61773 | Sibley, IL | 12 mi |
| 61731 | Cropsey, IL | 12.1 mi |
| 61730 | Cooksville, IL | 12.7 mi |
| 60933 | Elliott, IL | 13.3 mi |
Questions about 61770
What is the ZIP+4 code for 61770?
61770 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 61770, you need to look up a specific street address to get them.
What city is 61770?
61770 is assigned to Saybrook, Illinois, in McLean 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.