ZIP Code 71866 — Winthrop, AR
71866 is a standard (street delivery) ZIP code serving Winthrop, Arkansas, in Little River 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 71866 at a glance
| ZIP code | 71866 |
|---|---|
| Primary city | Winthrop |
| State | Arkansas (AR) |
| County | Little River FIPS 05081 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 390 |
| Coordinates | 33.867380, -94.380420 |
How ZIP+4 works in 71866
The four digits after the hyphen encode a delivery segment inside 71866. 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 71866 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 71866.
| ZIP | City | Distance |
|---|---|---|
| 71842 | Horatio, AR | 5.5 mi |
| 71820 | Alleene, AR | 9.5 mi |
| 71836 | Foreman, AR | 10.7 mi |
| 71832 | De Queen, AR | 12 mi |
| 74740 | Haworth, OK | 13.4 mi |
| 71823 | Ben Lomond, AR | 14.8 mi |
| 71846 | Lockesburg, AR | 15.3 mi |
| 71865 | Wilton, AR | 16 mi |
| 74734 | Eagletown, OK | 18 mi |
| 71822 | Ashdown, AR | 19.1 mi |
| 71841 | Gillham, AR | 20.5 mi |
| 74745 | Idabel, OK | 24.8 mi |
Questions about 71866
What is the ZIP+4 code for 71866?
71866 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 71866, you need to look up a specific street address to get them.
What city is 71866?
71866 is assigned to Winthrop, Arkansas, in Little River 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.