ZIP Code 63010 — Arnold, MO
63010 is a standard (street delivery) ZIP code serving Arnold, Missouri, in Jefferson 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 63010 at a glance
| ZIP code | 63010 |
|---|---|
| Primary city | Arnold |
| State | Missouri (MO) |
| County | Jefferson FIPS 29099 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 34,478 |
| Coordinates | 38.429640, -90.393200 |
How ZIP+4 works in 63010
The four digits after the hyphen encode a delivery segment inside 63010. 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 63010 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 63010.
| ZIP | City | Distance |
|---|---|---|
| 63052 | Imperial, MO | 3.6 mi |
| 63129 | Saint Louis, MO | 4.3 mi |
| 63128 | Saint Louis, MO | 4.5 mi |
| 63053 | Kimmswick, MO | 4.6 mi |
| 63026 | Fenton, MO | 6.2 mi |
| 63012 | Barnhart, MO | 7.2 mi |
| 63127 | Saint Louis, MO | 7.4 mi |
| 63049 | High Ridge, MO | 8 mi |
| 63125 | Saint Louis, MO | 8.2 mi |
| 63126 | Saint Louis, MO | 8.3 mi |
| 63123 | Saint Louis, MO | 9 mi |
| 62236 | Columbia, IL | 9.8 mi |
Questions about 63010
What is the ZIP+4 code for 63010?
63010 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 63010, you need to look up a specific street address to get them.
What city is 63010?
63010 is assigned to Arnold, Missouri, in Jefferson 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.