840 area code: location, overlays and numbers
In Riverside, California, the US telephone area code 840 has been in service since 2021 and shares an overlay with 909.
- Location
- Riverside, California
- Service began
- 2021
- The time zone that applies
- The Pacific time zone
- Overlay
- 909
- Calls within the area
- Full 1 + 10-digit dialling
- Rate centre list
- 21
- Exhaust projection
- 2056
- The code for the country
- +1 (United States)
Source: NANPA public reports, the area code report and the rate-centre report, file dated 11/01/2026; the exhaust year is taken from NANPA's projection set 2026-1 (April 2026). We are not an official NANPA site.
Get an 840 number
There are two routes to a 840 number. Providers assign a new number with a plan, selected at sign-up from the numbers they hold in the code. Sellers list numbers they already hold, often with a pattern, at a one-time price; you then move that number to a provider.
Providers sorted by first-year cost
| Provider | Cheapest plan | First year | Link |
|---|---|---|---|
 Free app | Basic (Just for me), free | $0 | Open Google Voice |
 Free app | Free plan, free | $0 | Open TextNow |
 Developer API | Pay-as-you-go local number, $1.15 a month | $13.80 | Open Twilio |
 Second-number app | Standard, $3.99 a month billed yearly | $47.99 | Open Burner |
 Toll-free specialist | Solo, $6.99 a month billed yearly | $84 | Open UniTel Voice |
 Second-number app | Deluxe (local number), $6.99 a month billed yearly | $102.88 | Open GoDaddy Conversations (formerly Smartline) |
Sellers listing local numbers
| Seller | What it sells | Listed price | Monthly fee | Link |
|---|---|---|---|---|
 Marketplace | Local numbers | From $9 one-time | None stated | Search at Exclusive Digits |
 Marketplace | Local and toll-free | From $9.95 one-time | $2.99 a month | Search at NumberBarn |
 Number broker | Local and toll-free | From $99 one-time | None stated | Search at RingBoost |
 Number broker | Local and toll-free | From $100 one-time | None stated | Search at PhoneNumberExpert |
| 212areacode.comNumber broker | Local numbers | From $150 one-time | None stated | Search at 212areacode.com |
Some sellers and providers may pay us a referral fee. The order is by first-year cost, and a referral fee never changes it. How we earn
Places in the 840 area code
For 840, NANPA lists 21 rate centres. Each one is a local calling area where numbers get assigned:
Listed here: Arrowhead, Upland, Big Bear City, San Bernardino, Big Bear Lake, Running Springs, Calimesa, Rialto, Chino, Redlands, Claremont, Pomona, Colton, Ontario, Crestline, Mentone, Diamond Bar, Marshall, Etiwanda, Highland, Fontana.
Area codes related to this one
The same area and the same numbers pool: 909. Any of these codes can give you a new number for this area, so ask for the code you want.
More codes used in California: 213, 415, 916, 714, 805, 209, 408, 707, 619, 818, 510, 310, 562, 760, 626, 650, 530, 925, 949, 323, 831, 559, 661, 858, 951, 424, 657, 747, 442, 669, 628, 279, 820, 341, 350, 369, 738, 837 and 357.
840 area code questions
Where is area code 840?
Calls to 840 ring in Riverside, California, in the Riverside-San Bernardino-Ontario, CA area.
What country code does a 840 number use?
+1. The North American Numbering Plan includes 840. From abroad, dial +1 840 along with the 7-digit number.
What time is it in the 840 area code?
Pacific time applies to 840.
Which callers use 840?
Anyone holding a number in this code might be a home, a mobile, a local business, or a caller faking a local number. When a 840 number appears on your screen, it points to where the number was assigned, not who the caller is.