ZIP Code 46403 — Gary, IN
46403 is a standard (street delivery) ZIP code serving Gary, Indiana, in Lake 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 46403 at a glance
| ZIP code | 46403 |
|---|---|
| Primary city | Gary |
| State | Indiana (IN) |
| County | Lake FIPS 18089 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 10,929 |
| Coordinates | 41.606360, -87.258030 |
How ZIP+4 works in 46403
The four digits after the hyphen encode a delivery segment inside 46403. 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 46403 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 Gary
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 46403.
| ZIP | City | Distance |
|---|---|---|
| 46405 | Lake Station, IN | 2.2 mi |
| 46402 | Gary, IN | 3.9 mi |
| 46407 | Gary, IN | 4.2 mi |
| 46368 | Portage, IN | 4.3 mi |
| 46409 | Gary, IN | 5.3 mi |
| 46342 | Hobart, IN | 6.2 mi |
| 46404 | Gary, IN | 6.2 mi |
| 46408 | Gary, IN | 7.2 mi |
| 46406 | Gary, IN | 7.7 mi |
| 46393 | Wheeler, IN | 7.9 mi |
| 46410 | Merrillville, IN | 9.5 mi |
| 46323 | Hammond, IN | 10.1 mi |
Questions about 46403
What is the ZIP+4 code for 46403?
46403 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 46403, you need to look up a specific street address to get them.
What city is 46403?
46403 is assigned to Gary, Indiana, in Lake 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.