ZIP Code 21530 — Flintstone, MD
21530 is a standard (street delivery) ZIP code serving Flintstone, Maryland, in Allegany 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 21530 at a glance
| ZIP code | 21530 |
|---|---|
| Primary city | Flintstone |
| State | Maryland (MD) |
| County | Allegany FIPS 24001 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 1,404 |
| Coordinates | 39.688780, -78.541380 |
How ZIP+4 works in 21530
The four digits after the hyphen encode a delivery segment inside 21530. 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 21530 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 21530.
| ZIP | City | Distance |
|---|---|---|
| 21555 | Oldtown, MD | 7 mi |
| 21766 | Little Orleans, MD | 7.9 mi |
| 17211 | Artemas, PA | 8 mi |
| 15535 | Clearville, PA | 10.6 mi |
| 21502 | Cumberland, MD | 11.9 mi |
| 21560 | Spring Gap, MD | 12.2 mi |
| 26767 | Wiley Ford, WV | 12.5 mi |
| 21529 | Ellerslie, MD | 12.5 mi |
| 25422 | Great Cacapon, WV | 13.2 mi |
| 15545 | Hyndman, PA | 13.9 mi |
| 21524 | Corriganville, MD | 13.9 mi |
| 25431 | Levels, WV | 14 mi |
Questions about 21530
What is the ZIP+4 code for 21530?
21530 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 21530, you need to look up a specific street address to get them.
What city is 21530?
21530 is assigned to Flintstone, Maryland, in Allegany 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.