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951 Area Code Begins July 17 in Western Riverside County

The supply of new phone numbers in the 909 area code, which is currently used in parts of Riverside, San Bernardino and Los Angeles counties, is so low that another area code must be added to the area to make more phone numbers available. This will be done by splitting the present 909 area in two, generally along the Riverside/San Bernardino county line and adding a new area code – 951 – in western Riverside County. Because the split line follows the boundaries of telephone service areas rather than exactly following county boundaries, you should check the list below to see which prefixes will be in the 951 area code.

The area code change does not change any costs to call a phone number – a call that is local for you today will remain a local call. Also, calls placed to and from callers in the same area code may continue to be placed by dialing just the sevendigit number.

From July 17 through October 29, 2004, you have the option of using the new area code or not and the call will still go through. This will allow consumers time to get used to the new area code and to update automatic dialing equipment. On October 30, 2004, the 951 area code must be used on calls placed from phones outside the new area code or the call will not go through.

Consumers who use automatic dialing equipment to call numbers that are switching to the 951 area code will have to update those numbers to include the 951 area code. Likewise consumers in the 951 area code must program their machines to add 909 to the phone numbers remaining in the 909 area code. When reprogramming equipment, such as computer modems, fax machines, and phones with automatic dialing capabilities, don't forget to add the "1" just before the area code.

Below you will find a map and a list of the prefixes that will change to the 951 area code. The prefix is the first three digits of the seven-digit number.

If the first three numbers of the seven-digit phone number are any of the following, then the phone number will be changed from the 909 area code to the 951 area code on July 17, 2004.

List of PrefixesArea 909 Overlay Map


Last Modified: 1/14/2008

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