ZIP Code 48503 — Flint, MI
48503 is a standard (street delivery) ZIP code serving Flint, Michigan, in Genesee 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 48503 at a glance
| ZIP code | 48503 |
|---|---|
| Primary city | Flint |
| State | Michigan (MI) |
| County | Genesee FIPS 26049 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Detroit |
| Population | 22,347 |
| Coordinates | 43.011390, -83.689010 |
How ZIP+4 works in 48503
The four digits after the hyphen encode a delivery segment inside 48503. 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 48503 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 Flint
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 48503.
| ZIP | City | Distance |
|---|---|---|
| 48502 | Flint, MI | 0.2 mi |
| 48529 | Burton, MI | 3 mi |
| 48507 | Flint, MI | 3.5 mi |
| 48505 | Flint, MI | 4 mi |
| 48509 | Burton, MI | 4.3 mi |
| 48504 | Flint, MI | 4.3 mi |
| 48519 | Burton, MI | 4.4 mi |
| 48506 | Flint, MI | 5.1 mi |
| 48532 | Flint, MI | 5.3 mi |
| 48439 | Grand Blanc, MI | 7.1 mi |
| 48458 | Mount Morris, MI | 7.6 mi |
| 48437 | Genesee, MI | 7.8 mi |
Questions about 48503
What is the ZIP+4 code for 48503?
48503 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 48503, you need to look up a specific street address to get them.
What city is 48503?
48503 is assigned to Flint, Michigan, in Genesee 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.