ZIP Code 61077 — Seward, IL
61077 is a standard (street delivery) ZIP code serving Seward, Illinois, in Winnebago 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 61077 at a glance
| ZIP code | 61077 |
|---|---|
| Primary city | Seward |
| State | Illinois (IL) |
| County | Winnebago FIPS 17201 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 97 |
| Coordinates | 42.240120, -89.348060 |
How ZIP+4 works in 61077
The four digits after the hyphen encode a delivery segment inside 61077. 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 61077 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 61077.
| ZIP | City | Distance |
|---|---|---|
| 61063 | Pecatonica, IL | 5 mi |
| 61088 | Winnebago, IL | 5.2 mi |
| 61047 | Leaf River, IL | 6.5 mi |
| 61039 | German Valley, IL | 6.6 mi |
| 61067 | Ridott, IL | 7.8 mi |
| 61010 | Byron, IL | 8.3 mi |
| 61102 | Rockford, IL | 9.8 mi |
| 61084 | Stillman Valley, IL | 11.7 mi |
| 61101 | Rockford, IL | 12.3 mi |
| 61007 | Baileyville, IL | 12.7 mi |
| 61054 | Mount Morris, IL | 13.7 mi |
| 61070 | Rock City, IL | 13.7 mi |
Questions about 61077
What is the ZIP+4 code for 61077?
61077 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 61077, you need to look up a specific street address to get them.
What city is 61077?
61077 is assigned to Seward, Illinois, in Winnebago 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.