ZIP Code 52078 — Worthington, IA
52078 is a standard (street delivery) ZIP code serving Worthington, Iowa, in Dubuque 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 52078 at a glance
| ZIP code | 52078 |
|---|---|
| Primary city | Worthington |
| State | Iowa (IA) |
| County | Dubuque FIPS 19061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 870 |
| Coordinates | 42.395060, -91.115340 |
How ZIP+4 works in 52078
The four digits after the hyphen encode a delivery segment inside 52078. 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 52078 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 52078.
| ZIP | City | Distance |
|---|---|---|
| 52046 | Farley, IA | 6.1 mi |
| 52237 | Hopkinton, IA | 7.8 mi |
| 52040 | Dyersville, IA | 8.1 mi |
| 52033 | Cascade, IA | 9.9 mi |
| 52045 | Epworth, IA | 10.3 mi |
| 52041 | Earlville, IA | 10.4 mi |
| 52223 | Delhi, IA | 10.7 mi |
| 52036 | Delaware, IA | 12.7 mi |
| 52310 | Monticello, IA | 12.8 mi |
| 52065 | New Vienna, IA | 13 mi |
| 52056 | Luxemburg, IA | 14.6 mi |
| 52252 | Langworthy, IA | 14.8 mi |
Questions about 52078
What is the ZIP+4 code for 52078?
52078 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 52078, you need to look up a specific street address to get them.
What city is 52078?
52078 is assigned to Worthington, Iowa, in Dubuque 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.