ZIP Code 42631 — Marshes Siding, KY
42631 is a standard (street delivery) ZIP code serving Marshes Siding, Kentucky, in McCreary 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 42631 at a glance
| ZIP code | 42631 |
|---|---|
| Primary city | Marshes Siding |
| State | Kentucky (KY) |
| County | McCreary FIPS 21147 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 66 |
| Coordinates | 36.740390, -84.480980 |
How ZIP+4 works in 42631
The four digits after the hyphen encode a delivery segment inside 42631. 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 42631 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 42631.
| ZIP | City | Distance |
|---|---|---|
| 42653 | Whitley City, KY | 3 mi |
| 42638 | Revelo, KY | 4.6 mi |
| 42635 | Pine Knot, KY | 6.3 mi |
| 42647 | Stearns, KY | 7.9 mi |
| 42649 | Strunk, KY | 8.7 mi |
| 42634 | Parkers Lake, KY | 10.3 mi |
| 42519 | Burnside, KY | 14.1 mi |
| 37892 | Winfield, TN | 14.1 mi |
| 42518 | Bronston, KY | 15.6 mi |
| 37841 | Oneida, TN | 16.4 mi |
| 40769 | Williamsburg, KY | 17.2 mi |
| 37819 | Newcomb, TN | 19.6 mi |
Questions about 42631
What is the ZIP+4 code for 42631?
42631 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 42631, you need to look up a specific street address to get them.
What city is 42631?
42631 is assigned to Marshes Siding, Kentucky, in McCreary 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.