ZIP Code 77861 — Iola, TX
77861 is a standard (street delivery) ZIP code serving Iola, Texas, in Grimes 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 77861 at a glance
| ZIP code | 77861 |
|---|---|
| Primary city | Iola |
| State | Texas (TX) |
| County | Grimes FIPS 48185 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 3,065 |
| Coordinates | 30.724770, -96.099080 |
How ZIP+4 works in 77861
The four digits after the hyphen encode a delivery segment inside 77861. 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 77861 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 77861.
| ZIP | City | Distance |
|---|---|---|
| 77872 | North Zulch, TX | 11.1 mi |
| 77831 | Bedias, TX | 11.3 mi |
| 77875 | Roans Prairie, TX | 13.4 mi |
| 77808 | Bryan, TX | 13.5 mi |
| 77802 | Bryan, TX | 14 mi |
| 77830 | Anderson, TX | 14.7 mi |
| 77845 | College Station, TX | 15.4 mi |
| 77840 | College Station, TX | 15.4 mi |
| 77843 | College Station, TX | 16.2 mi |
| 77876 | Shiro, TX | 16.6 mi |
| 77801 | Bryan, TX | 16.8 mi |
| 77866 | Millican, TX | 17.3 mi |
Questions about 77861
What is the ZIP+4 code for 77861?
77861 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 77861, you need to look up a specific street address to get them.
What city is 77861?
77861 is assigned to Iola, Texas, in Grimes 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.