ZIP Code 41091 — Union, KY
41091 is a standard (street delivery) ZIP code serving Union, Kentucky, in Boone 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 41091 at a glance
| ZIP code | 41091 |
|---|---|
| Primary city | Union |
| State | Kentucky (KY) |
| County | Boone FIPS 21015 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 25,244 |
| Coordinates | 38.920560, -84.737900 |
How ZIP+4 works in 41091
The four digits after the hyphen encode a delivery segment inside 41091. 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 41091 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 41091.
| ZIP | City | Distance |
|---|---|---|
| 41005 | Burlington, KY | 6.2 mi |
| 41042 | Florence, KY | 6.6 mi |
| 41094 | Walton, KY | 6.7 mi |
| 41092 | Verona, KY | 7.3 mi |
| 47038 | Patriot, IN | 7.6 mi |
| 41018 | Erlanger, KY | 9.8 mi |
| 41095 | Warsaw, KY | 9.9 mi |
| 41080 | Petersburg, KY | 10.2 mi |
| 47040 | Rising Sun, IN | 10.2 mi |
| 41051 | Independence, KY | 10.4 mi |
| 41048 | Hebron, KY | 11.4 mi |
| 41017 | Ft Mitchell, KY | 12.1 mi |
Questions about 41091
What is the ZIP+4 code for 41091?
41091 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 41091, you need to look up a specific street address to get them.
What city is 41091?
41091 is assigned to Union, Kentucky, in Boone 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.