ZIP Code 73855 — Rosston, OK
73855 is a standard (street delivery) ZIP code serving Rosston, Oklahoma, in Harper 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 73855 at a glance
| ZIP code | 73855 |
|---|---|
| Primary city | Rosston |
| State | Oklahoma (OK) |
| County | Harper FIPS 40059 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 253 |
| Coordinates | 36.884810, -99.858770 |
How ZIP+4 works in 73855
The four digits after the hyphen encode a delivery segment inside 73855. 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 73855 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 73855.
| ZIP | City | Distance |
|---|---|---|
| 67840 | Englewood, KS | 15.5 mi |
| 73834 | Buffalo, OK | 16.1 mi |
| 73844 | Gate, OK | 17.1 mi |
| 73848 | Laverne, OK | 18.7 mi |
| 67831 | Ashland, KS | 20.6 mi |
| 73851 | May, OK | 21.9 mi |
| 73841 | Fort Supply, OK | 26.7 mi |
| 67127 | Protection, KS | 27.8 mi |
| 67864 | Meade, KS | 32.2 mi |
| 73843 | Gage, OK | 33.6 mi |
| 73840 | Fargo, OK | 35.8 mi |
| 73801 | Woodward, OK | 36.9 mi |
Questions about 73855
What is the ZIP+4 code for 73855?
73855 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 73855, you need to look up a specific street address to get them.
What city is 73855?
73855 is assigned to Rosston, Oklahoma, in Harper 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.