| City: | San Juan, Puerto Rico |
| City Alias: | Rio Piedras |
| County: | San Juan County |
| Timezone: | Atlantic (GMT -04:00) |
| Local Time: | 9:10:09 PM |
| Population: | No Population Data |
| Area Codes: | 787 / 939 |
| Classification: | PO Box |
| Coordinates: | 18.4683, -66.1061 |
| Quick Link: |
The Río Piedras area, an alternate name for this zone, sits within the larger San Juan municipality. The single-street structure with 254 delivery records suggests an urban mail facility serving a specific geographic sector. Puerto Rico's postal system often uses these specialized PO Box ZIP codes to concentrate box service while neighboring ZIPs handle carrier routes. This arrangement isn't about isolation or limited infrastructure. It's administrative segmentation within a densely populated metropolitan area.
A single Puerto Rican street name reflects the Spanish linguistic heritage of San Juan. The street serves as the geographic anchor for this PO Box facility.
ZIP Code 00931 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: | 374Source: 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 00931 is located in San Juan County, Puerto Rico, within the San Juan-Bayamon-Caguas, PR Metropolitan Statistical Area (CBSA 41980). This Metro area has a population of 2,063,795 people, about 0.00% of whom live in ZIP Code 00931. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | San Juan-Bayamon-Caguas, PRSource: Census |
| CBSA Number: | 41980Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 2,063,795Source: Census |
| MSA: | San Juan-Caguas-Arecibo, PR CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | No DistrictsSource: USPS |
| Congressional Land Area: | sq miSource: Census |
| PMSA: | San Juan-Bayamon, PR PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 7276770Source: Census |
| Place Name: | San Juan zona urbana; Puerto RicoSource: Census |
We could not locate which school district 00931 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.