Monrovia, CA ZIP Codes
Monrovia, California has 2 ZIP codes: for street addresses and for PO boxes.
Mail addressed to Monrovia covers nearby places too.
Where the 91016 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
91017 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Monrovia city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Monrovia
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Monrovia PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 91016 | street delivery Monrovia |
| 91017 | PO boxes at the Monrovia post office Monrovia |
Why your mail may say Monrovia when you live outside it
Monrovia ZIP codes also cover Mayflower Village and South Monrovia Island, so a letter addressed to Monrovia can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Los Angeles County property records show which city you are in.
Monrovia ZIP code questions
What is the main ZIP code for Monrovia?
91016, the ZIP code of the main Monrovia post office at 225 S Ivy Ave.
Which Monrovia ZIP codes are for PO boxes only?
91017. Mail to it goes to boxes at the post office, not to street addresses.
What county is Monrovia in?
Los Angeles County.
ZIP codes for towns near Monrovia
More towns near Monrovia: Glendora, San Gabriel, West Covina, Rosemead, Pasadena, Altadena, La Puente, Alhambra, San Dimas.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections