ZIP Code 52003 — Dubuque, IA
52003 is a standard (street delivery) ZIP code serving Dubuque, 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 52003 at a glance
| ZIP code | 52003 |
|---|---|
| Primary city | Dubuque |
| State | Iowa (IA) |
| County | Dubuque FIPS 19061 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 13,796 |
| Coordinates | 42.434340, -90.675060 |
How ZIP+4 works in 52003
The four digits after the hyphen encode a delivery segment inside 52003. 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 52003 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.
Other ZIP codes in Dubuque
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 52003.
| ZIP | City | Distance |
|---|---|---|
| 61025 | East Dubuque, IL | 6.4 mi |
| 52068 | Peosta, IA | 7 mi |
| 52001 | Dubuque, IA | 7.9 mi |
| 52002 | Dubuque, IA | 8 mi |
| 52071 | Saint Donatus, IA | 8.4 mi |
| 52054 | La Motte, IA | 9.2 mi |
| 52079 | Zwingle, IA | 10.4 mi |
| 53811 | Hazel Green, WI | 10.7 mi |
| 53812 | Kieler, WI | 10.8 mi |
| 52039 | Durango, IA | 11.7 mi |
| 52032 | Bernard, IA | 13.1 mi |
| 52045 | Epworth, IA | 13.1 mi |
Questions about 52003
What is the ZIP+4 code for 52003?
52003 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 52003, you need to look up a specific street address to get them.
What city is 52003?
52003 is assigned to Dubuque, 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.