ZIP Code 19311 — Avondale, PA
19311 is a standard (street delivery) ZIP code serving Avondale, Pennsylvania, in Chester 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 19311 at a glance
| ZIP code | 19311 |
|---|---|
| Primary city | Avondale |
| State | Pennsylvania (PA) |
| County | Chester FIPS 42029 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 11,692 |
| Coordinates | 39.821630, -75.768870 |
How ZIP+4 works in 19311
The four digits after the hyphen encode a delivery segment inside 19311. 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 19311 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 19311.
| ZIP | City | Distance |
|---|---|---|
| 19374 | Toughkenamon, PA | 1.2 mi |
| 19390 | West Grove, PA | 3.9 mi |
| 19348 | Kennett Square, PA | 4.1 mi |
| 19350 | Landenberg, PA | 4.3 mi |
| 19707 | Hockessin, DE | 5.3 mi |
| 19375 | Unionville, PA | 5.6 mi |
| 19352 | Lincoln University, PA | 7 mi |
| 19736 | Yorklyn, DE | 7.3 mi |
| 19711 | Newark, DE | 7.6 mi |
| 19808 | Wilmington, DE | 8 mi |
| 19807 | Wilmington, DE | 8.4 mi |
| 19330 | Cochranville, PA | 8.6 mi |
Questions about 19311
What is the ZIP+4 code for 19311?
19311 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 19311, you need to look up a specific street address to get them.
What city is 19311?
19311 is assigned to Avondale, Pennsylvania, in Chester 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.