ZIP Code 50703 — Waterloo, IA
50703 is a standard (street delivery) ZIP code serving Waterloo, Iowa, in Black Hawk 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 50703 at a glance
| ZIP code | 50703 |
|---|---|
| Primary city | Waterloo |
| State | Iowa (IA) |
| County | Black Hawk FIPS 19013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 17,952 |
| Coordinates | 42.548170, -92.281950 |
How ZIP+4 works in 50703
The four digits after the hyphen encode a delivery segment inside 50703. 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 50703 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 Waterloo
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 50703.
| ZIP | City | Distance |
|---|---|---|
| 50623 | Dewar, IA | 4 mi |
| 50707 | Evansdale, IA | 4.9 mi |
| 50667 | Raymond, IA | 6.1 mi |
| 50626 | Dunkerton, IA | 6.1 mi |
| 50702 | Waterloo, IA | 6.5 mi |
| 50622 | Denver, IA | 9 mi |
| 50634 | Gilbertville, IA | 9.6 mi |
| 50701 | Waterloo, IA | 9.6 mi |
| 50668 | Readlyn, IA | 10.2 mi |
| 50613 | Cedar Falls, IA | 10.7 mi |
| 50648 | Jesup, IA | 11.6 mi |
| 50629 | Fairbank, IA | 12.1 mi |
Questions about 50703
What is the ZIP+4 code for 50703?
50703 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 50703, you need to look up a specific street address to get them.
What city is 50703?
50703 is assigned to Waterloo, Iowa, in Black Hawk 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.