ZIP Code 72170 — Ulm, AR
72170 is a standard (street delivery) ZIP code serving Ulm, Arkansas, in Prairie 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 72170 at a glance
| ZIP code | 72170 |
|---|---|
| Primary city | Ulm |
| State | Arkansas (AR) |
| County | Prairie FIPS 05117 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 174 |
| Coordinates | 34.578190, -91.426550 |
How ZIP+4 works in 72170
The four digits after the hyphen encode a delivery segment inside 72170. 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 72170 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 72170.
| ZIP | City | Distance |
|---|---|---|
| 72134 | Roe, AR | 3.9 mi |
| 72026 | Casscoe, AR | 7.6 mi |
| 72041 | De Valls Bluff, AR | 11 mi |
| 72160 | Stuttgart, AR | 11.1 mi |
| 72029 | Clarendon, AR | 12.5 mi |
| 72003 | Almyra, AR | 13.5 mi |
| 72038 | Crocketts Bluff, AR | 14.2 mi |
| 72069 | Holly Grove, AR | 16.9 mi |
| 72064 | Hazen, AR | 18.3 mi |
| 72072 | Humnoke, AR | 19.4 mi |
| 72073 | Humphrey, AR | 19.5 mi |
| 72108 | Monroe, AR | 21.1 mi |
Questions about 72170
What is the ZIP+4 code for 72170?
72170 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 72170, you need to look up a specific street address to get them.
What city is 72170?
72170 is assigned to Ulm, Arkansas, in Prairie 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.