ZIP Code 18966 — Southampton, PA
18966 is a standard (street delivery) ZIP code serving Southampton, Pennsylvania, in Bucks 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 18966 at a glance
| ZIP code | 18966 |
|---|---|
| Primary city | Southampton |
| State | Pennsylvania (PA) |
| County | Bucks FIPS 42017 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 36,370 |
| Coordinates | 40.187900, -75.005570 |
How ZIP+4 works in 18966
The four digits after the hyphen encode a delivery segment inside 18966. 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 18966 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 18966.
| ZIP | City | Distance |
|---|---|---|
| 18954 | Richboro, PA | 2.4 mi |
| 19053 | Feasterville Trevose, PA | 2.7 mi |
| 18974 | Warminster, PA | 4.1 mi |
| 19009 | Bryn Athyn, PA | 4.6 mi |
| 19006 | Huntingdon Valley, PA | 4.8 mi |
| 19116 | Philadelphia, PA | 4.9 mi |
| 19047 | Langhorne, PA | 5 mi |
| 19040 | Hatboro, PA | 5.4 mi |
| 18980 | Wycombe, PA | 5.9 mi |
| 18940 | Newtown, PA | 6 mi |
| 18929 | Jamison, PA | 6.1 mi |
| 19154 | Philadelphia, PA | 6.5 mi |
Questions about 18966
What is the ZIP+4 code for 18966?
18966 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 18966, you need to look up a specific street address to get them.
What city is 18966?
18966 is assigned to Southampton, Pennsylvania, in Bucks 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.