ZIP Code 06103 — Hartford, CT
06103 is a standard (street delivery) ZIP code serving Hartford, Connecticut, in Capitol 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 06103 at a glance
| ZIP code | 06103 |
|---|---|
| Primary city | Hartford |
| State | Connecticut (CT) |
| County | Capitol FIPS 09110 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 2,949 |
| Coordinates | 41.764770, -72.670120 |
How ZIP+4 works in 06103
The four digits after the hyphen encode a delivery segment inside 06103. 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 06103 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.
Other ZIP codes in Hartford
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 06103.
| ZIP | City | Distance |
|---|---|---|
| 06120 | Hartford, CT | 1.7 mi |
| 06114 | Hartford, CT | 1.8 mi |
| 06106 | Hartford, CT | 1.8 mi |
| 06105 | Hartford, CT | 1.9 mi |
| 06112 | Hartford, CT | 2.4 mi |
| 06108 | East Hartford, CT | 2.7 mi |
| 06119 | West Hartford, CT | 2.9 mi |
| 06118 | East Hartford, CT | 3.3 mi |
| 06110 | West Hartford, CT | 4 mi |
| 06109 | Wethersfield, CT | 4.4 mi |
| 06107 | West Hartford, CT | 4.7 mi |
| 06117 | West Hartford, CT | 5 mi |
Questions about 06103
What is the ZIP+4 code for 06103?
06103 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 06103, you need to look up a specific street address to get them.
What city is 06103?
06103 is assigned to Hartford, Connecticut, in Capitol 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.