| City: | Altoona, Pennsylvania |
| County: | Blair County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 9:23:20 PM |
| Population: | No Population Data |
| Area Codes: | 582 / 814 |
| Classification: | PO Box |
| Coordinates: | 40.5188, -78.3952 |
| Quick Link: |
ZIP code 16603 serves a commercial district in Altoona, Pennsylvania, focused primarily on a single location at 11th Avenue. Unlike residential ZIP codes, this area has zero population within its boundaries. Instead, it functions as a business mail facility serving 170 business delivery points and maintaining 194 PO Boxes.
The postal infrastructure here supports 23 business establishments employing 535 workers. All street delivery concentrates on 11th Avenue, where 138 delivery records indicate a multi-unit commercial building. This pattern is typical of downtown business districts where a PO Box-classified ZIP handles mail for offices, professional services, and commercial tenants within a compact area.
Altoona residents and businesses in surrounding areas receive street delivery through neighboring ZIP code 16601. ZIP 16603 exists as a specialized facility serving the commercial core, offering both PO Box services and building-based delivery for business tenants. This isn't a PO Box Only Zone, and city carrier delivery is available throughout the broader Altoona area.
All delivery concentrates on 11th Avenue, a multi-unit commercial building in downtown Altoona.
ZIP Code 16603 supports both business and residential activity. According to the Business Census (2024), there are 22 business establishments, employing about 436 people with an annual payroll of $21,154,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 964Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 22Source: CBP |
| 1st Quarter Payroll: | $5,228,000Source: CBP |
| Annual Payroll: | $21,154,000Source: CBP |
| # of Employees: | 436Source: CBP |
ZIP Code 16603 is located in Blair County, Pennsylvania, within the Altoona, PA Metropolitan Statistical Area (CBSA 11020) and Pennsylvania's 13rd Congressional District. This Metro area has a population of 127,089 people, about 0.00% of whom live in ZIP Code 16603. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Altoona, PASource: Census |
| CBSA Number: | 11020Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 127,089Source: Census |
| MSA: | Altoona, PA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 13Source: USPS |
| Congressional Land Area: | 155.18 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 4202184Source: Census |
| Place Name: | Altoona city; PennsylvaniaSource: Census |
We could not locate which school district 16603 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.