There are 421 phone number prefixes within area code 831. Additionally, there are more than 400 phone numbers in this area code that have received at least one user report. The location of calls from area code 831 is California, USA. Most numbers in this area code are in US Pacific time, where the time is currently 3:22:41 AM on September 5, 2025.
Choose a phone number from the list below to browse user reports for . You can also use the search box above to search for user reports about any phone number, or to file a report about any phone number.
| Prefix | City / State | Primary Telco |
|---|---|---|
| 831-911 | California | |
| 831-912 | Monterey, CA | American Messaging Services, Llc |
| 831-915 | Monterey, CA | New Cingular Wireless Pcs, Llc |
| 831-916 | California | |
| 831-917 | Monterey, CA | New Cingular Wireless Pcs, Llc |
| 831-920 | Monterey, CA | Level 3 Communications, Llc - Ca |
| 831-921 | Tres Pinos, CA | Level 3 Communications, Llc - Ca |
| 831-946 | Santa Cruz, CA | Fractel, Llc |
| 831-948 | Watsonville, CA | Utility Telecom Group, Llc - Ca |
| 831-949 | California | |
| 831-950 | California | |
| 831-951 | California | |
| 831-958 | California | |
| 831-959 | California | |
| 831-970 | Salinas, CA | Sprint Spectrum, L.p. |
| 831-975 | Salinas, CA | Comcast Ip Phone, Llc |
| 831-976 | California | |
| 831-988 | California | |
| 831-996 | Tres Pinos, CA | O1 Communications, Inc. - Ca |
| 831-998 | Salinas, CA | Mcimetro Access Transmission Services Llc - Ca |
| 831-999 | Santa Cruz, CA | Peerless Network Of California, Llc - Ca |
September 4, 2025