840 Area Code
Area code 840 generally covers Upland, Fontana, and Redlands in the U.S. State of California.
Top cities in area code 840
| City | Prefixes |
|---|---|
| Upland, CA | 28.6% |
| Fontana, CA | 28.6% |
| Redlands, CA | 14.3% |
| Pomona, CA | 14.3% |
| Chino, CA | 14.3% |
Area code 840 generally covers Upland, Fontana, and Redlands in the U.S. State of California.
| City | Prefixes |
|---|---|
| Upland, CA | 28.6% |
| Fontana, CA | 28.6% |
| Redlands, CA | 14.3% |
| Pomona, CA | 14.3% |
| Chino, CA | 14.3% |