ZIP Code 43066 — Radnor, OH
43066 is a standard (street delivery) ZIP code serving Radnor, Ohio, in Delaware 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 43066 at a glance
| ZIP code | 43066 |
|---|---|
| Primary city | Radnor |
| State | Ohio (OH) |
| County | Delaware FIPS 39041 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,368 |
| Coordinates | 40.398770, -83.163130 |
How ZIP+4 works in 43066
The four digits after the hyphen encode a delivery segment inside 43066. 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 43066 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 43066.
| ZIP | City | Distance |
|---|---|---|
| 43342 | Prospect, OH | 5.4 mi |
| 43036 | Magnetic Springs, OH | 6.2 mi |
| 43356 | Waldo, OH | 7.3 mi |
| 43061 | Ostrander, OH | 7.9 mi |
| 43015 | Delaware, OH | 8.8 mi |
| 43344 | Richwood, OH | 9.5 mi |
| 43322 | Green Camp, OH | 9.5 mi |
| 43003 | Ashley, OH | 10.2 mi |
| 43007 | Broadway, OH | 13.6 mi |
| 43302 | Marion, OH | 14 mi |
| 43040 | Marysville, OH | 14 mi |
| 43341 | New Bloomington, OH | 15.8 mi |
Questions about 43066
What is the ZIP+4 code for 43066?
43066 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 43066, you need to look up a specific street address to get them.
What city is 43066?
43066 is assigned to Radnor, Ohio, in Delaware 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.