ZIP Code 77566 — Lake Jackson, TX
77566 is a standard (street delivery) ZIP code serving Lake Jackson, Texas, in Brazoria 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 77566 at a glance
| ZIP code | 77566 |
|---|---|
| Primary city | Lake Jackson |
| State | Texas (TX) |
| County | Brazoria FIPS 48039 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 30,246 |
| Coordinates | 29.049710, -95.475110 |
How ZIP+4 works in 77566
The four digits after the hyphen encode a delivery segment inside 77566. 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 77566 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 77566.
| ZIP | City | Distance |
|---|---|---|
| 77531 | Clute, TX | 4.5 mi |
| 77422 | Brazoria, TX | 8.3 mi |
| 77515 | Angleton, TX | 8.9 mi |
| 77541 | Freeport, TX | 9.3 mi |
| 77486 | West Columbia, TX | 14.4 mi |
| 77534 | Danbury, TX | 15.3 mi |
| 77415 | Cedar Lane, TX | 16.8 mi |
| 77480 | Sweeny, TX | 17.9 mi |
| 77430 | Damon, TX | 18.4 mi |
| 77577 | Liverpool, TX | 19.2 mi |
| 77431 | Danciger, TX | 21.8 mi |
| 77583 | Rosharon, TX | 22.6 mi |
Questions about 77566
What is the ZIP+4 code for 77566?
77566 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 77566, you need to look up a specific street address to get them.
What city is 77566?
77566 is assigned to Lake Jackson, Texas, in Brazoria 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.