| City: | Monrovia, California |
| County: | Los Angeles County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 10:01:33 PM |
| Population: | No Population Data |
| Area Code: | 626 |
| Classification: | PO Box |
| Coordinates: | 34.1482, -117.9983 |
| Quick Link: |
ZIP code 91017 doesn't represent a neighborhood or community. It's a PO Box-only ZIP assigned to a single post office building in Monrovia, California. The actual Monrovia community receives street delivery through ZIP 91016, which completely surrounds this point-location ZIP.
The Monrovia post office at S Ivy Avenue maintains 859 PO Boxes. With zero residential population in the 91017 boundaries, every box is held by someone whose home address falls under a different ZIP code. This is common in suburban Los Angeles, where a city's main post office gets its own ZIP for PO Box operations while carrier routes operate under separate ZIPs.
About 322 businesses use 91017 as their mailing address. Some prefer the permanence of a PO Box over a street address, while others may operate from home and want a business-appropriate mailing location. The post office sits within the broader Monrovia neighborhood, close to Duarte, Arcadia, and Sierra Madre.
If you're mailing to someone in Monrovia, check whether they've given you a PO Box (91017) or street address (likely 91016). Using the wrong ZIP won't prevent delivery, but matching the address type to the correct ZIP helps mail move faster.
Only one street address exists because this ZIP covers just the post office building itself.
ZIP Code 91017 supports both business and residential activity. According to the Business Census (2024), there are 8 business establishments, employing about 35 people with an annual payroll of $3,714,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 2,847Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 8Source: CBP |
| 1st Quarter Payroll: | $705,000Source: CBP |
| Annual Payroll: | $3,714,000Source: CBP |
| # of Employees: | 35Source: CBP |
ZIP Code 91017 is located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (CBSA 31080) and California's 31st Congressional District. This Metro area has a population of 13,012,469 people, about 0.00% of whom live in ZIP Code 91017, and is subdivided into the Los Angeles-Long Beach-Glendale, CA division. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Los Angeles-Long Beach-Anaheim, CASource: Census |
| CBSA Number: | 31080Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | Los Angeles-Long Beach-Glendale, CA (CBSA Div 31084)Source: Census |
| CBSA Population: | 13,012,469Source: Census |
| MSA: | Los Angeles-Riverside-Orange County, CASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 31Source: USPS |
| Congressional Land Area: | 218.24 sq miSource: Census |
| PMSA: | Los Angeles-Long Beach, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0648648Source: Census |
| Place Name: | Monrovia city; CaliforniaSource: Census |
We could not locate which school district 91017 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 January 1, 2026.