Guasti ZIP code, California
The ZIP code for Guasti, CA is 91743, and its area codes are 909 and 840.
- USPS city name
- 1 ZIP code
- County
- San Bernardino County
- State
- California
NANPA lists no telephone rate centre for Guasti itself, so these are the area codes of the nearest one, Ontario (1.3 miles). A town on an area-code boundary can differ from its neighbour.
ZIP codes addressed as Guasti
Towns near Guasti
| Town | Population | Distance |
|---|---|---|
| Ontario | 180,547 | 2.2 mi |
| Rancho Cucamonga | 175,411 | 4.7 mi |
| Upland | 79,257 | 5.5 mi |
| Montclair | 37,810 | 6.4 mi |
| Eastvale | 70,633 | 7.0 mi |
| Chino | 92,652 | 7.3 mi |
| San Antonio Heights | 3,458 | 7.6 mi |
| Fontana | 214,169 | 7.7 mi |
| Jurupa Valley | 107,011 | 8.1 mi |
| Claremont | 36,595 | 8.4 mi |
| Norco | 25,054 | 9.8 mi |
| Pomona | 147,943 | 10.0 mi |
| Bloomington | 25,698 | 10.6 mi |
| La Verne | 30,600 | 11.2 mi |
More nearby: every ZIP code in San Bernardino County · California ZIP codes
Cite this page
zipcodes.pro. “Guasti, CA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/ca/guasti
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