| City: | Southwest, Pennsylvania |
| County: | Westmoreland County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 9:12:52 PM |
| Population: | No Population Data |
| Area Codes: | 724 / 878 |
| Classification: | PO Box |
| Coordinates: | 40.1949, -79.5247 |
| Quick Link: |
Southwest, Pennsylvania sits in Westmoreland County about 30 miles southeast of Pittsburgh. Despite its generic-sounding name, this small community maintains its own post office and ZIP code. The area covers less than one square mile but serves as a designated PO Box Only Zone, meaning there's no alternative delivery method available.
The post office maintains 87 PO Boxes and provides general delivery service. Mail carriers handle both city and rural routes here, delivering to about 88 residential addresses. This is a PO Box Only Zone even though carriers do deliver to some addresses. The distinction matters: residents who don't have carrier delivery must use a PO Box. There's no nearby sibling ZIP with the same city name offering alternative service.
Street names like Hecla Road and Hecla Lane reference the area's coal mining heritage. Academy Lane, Newtown Road, Patriot Drive, Mystic Hill Drive, and Overlook Drive complete the modest road network. The nearest urban areas are McKeesport and Monroeville, both about 16-18 miles away in the Pittsburgh metro.
Mail to Southwest uses ZIP code 15685. Residents without carrier delivery should use a PO Box address:
PO Box [number]
Southwest, PA 15685
Street names reference local mining heritage (Hecla) alongside typical residential development names.
ZIP Code 15685 is designated for PO Box delivery only; business establishment and employment data are not available.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 93Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 15685 is located in Westmoreland County, Pennsylvania, within the Pittsburgh, PA Metropolitan Statistical Area (CBSA 38300) and Pennsylvania's 14th Congressional District. This Metro area has a population of 2,356,285 people, about 0.00% of whom live in ZIP Code 15685. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Pittsburgh, PASource: Census |
| CBSA Number: | 38300Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 2,356,285Source: Census |
| MSA: | Pittsburgh, PA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 14Source: USPS |
| Congressional Land Area: | 209.29 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 15685 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.