ZIP Code 66006 — Baldwin City, KS
66006 is a standard (street delivery) ZIP code serving Baldwin City, Kansas, in Douglas 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 66006 at a glance
| ZIP code | 66006 |
|---|---|
| Primary city | Baldwin City |
| State | Kansas (KS) |
| County | Douglas FIPS 20045 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 8,013 |
| Coordinates | 38.794330, -95.239360 |
How ZIP+4 works in 66006
The four digits after the hyphen encode a delivery segment inside 66006. 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 66006 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 66006.
| ZIP | City | Distance |
|---|---|---|
| 66046 | Lawrence, KS | 8.1 mi |
| 66047 | Lawrence, KS | 8.7 mi |
| 66092 | Wellsville, KS | 10 mi |
| 66045 | Lawrence, KS | 11.1 mi |
| 66025 | Eudora, KS | 11.2 mi |
| 66067 | Ottawa, KS | 12.3 mi |
| 66021 | Edgerton, KS | 12.7 mi |
| 66049 | Lawrence, KS | 13.9 mi |
| 66524 | Overbrook, KS | 14.4 mi |
| 66076 | Pomona, KS | 15.7 mi |
| 66030 | Gardner, KS | 16.1 mi |
| 66044 | Lawrence, KS | 16.5 mi |
Questions about 66006
What is the ZIP+4 code for 66006?
66006 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 66006, you need to look up a specific street address to get them.
What city is 66006?
66006 is assigned to Baldwin City, Kansas, in Douglas 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.