Area code 840
Area code 840 serves Ontario and nearby parts of California, including Pomona, San Bernardino and Rancho Cucamonga. It is on Pacific Time, which observes daylight saving time. 909 is an overlay for the same area.
Area code 840 at a glance
| State | California (CA) |
| Main city | Ontario |
| Time zone | Pacific Time |
| UTC offset | UTC−8 in winter, UTC−7 in summer |
| Daylight saving time | Yes |
| Overlay codes | 909 |
Cities in 840
- Ontario
- Pomona
- San Bernardino
- Rancho Cucamonga
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call an 840 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for an 840 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 840 between |
|---|---|
| Eastern | 11:00 AM to 12:00 AM |
| Central | 10:00 AM to 11:00 PM |
| Mountain | 9:00 AM to 10:00 PM |
| Arizona | 8:00 AM to 9:00 PM |
| Pacific | 8:00 AM to 9:00 PM |
See the time in 840 without leaving your CRM
Parse is a free Chrome extension that shows the local time and weather beside every phone number on the page.
Other area codes in California
Questions about 840
What time zone is area code 840?
Area code 840 is on Pacific Time. It observes daylight saving time.
Where is area code 840?
Area code 840 is in California. Its main city is Ontario, and it also covers Pomona, San Bernardino and Rancho Cucamonga.
What are the legal hours to call an 840 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 840?
909 covers the same area as 840, so numbers in the same town can have either code.