ZIP Code 66621 — Topeka, KS
66621 is a standard (street delivery) ZIP code serving Topeka, Kansas, in Shawnee 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 66621 at a glance
| ZIP code | 66621 |
|---|---|
| Primary city | Topeka |
| State | Kansas (KS) |
| County | Shawnee FIPS 20177 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 442 |
| Coordinates | 39.033130, -95.702370 |
How ZIP+4 works in 66621
The four digits after the hyphen encode a delivery segment inside 66621. 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 66621 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 Topeka
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 66621.
| ZIP | City | Distance |
|---|---|---|
| 66622 | Topeka, KS | 1.2 mi |
| 66611 | Topeka, KS | 1.3 mi |
| 66612 | Topeka, KS | 1.3 mi |
| 66604 | Topeka, KS | 1.3 mi |
| 66603 | Topeka, KS | 2.2 mi |
| 66606 | Topeka, KS | 2.3 mi |
| 66607 | Topeka, KS | 3.7 mi |
| 66608 | Topeka, KS | 3.7 mi |
| 66609 | Topeka, KS | 3.9 mi |
| 66605 | Topeka, KS | 4 mi |
| 66616 | Topeka, KS | 4.9 mi |
| 66619 | Topeka, KS | 6 mi |
Questions about 66621
What is the ZIP+4 code for 66621?
66621 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 66621, you need to look up a specific street address to get them.
What city is 66621?
66621 is assigned to Topeka, Kansas, in Shawnee 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.