91710 is a ZIP Code, not an area code, and therefore does not have prefixes.
91710 is: Chino, California, USA
Two exist, 91708 and 91710.
There are hundreds of telephone prefixes in area code 919 (Raleigh, North Carolina, and nearby areas).
There are several hundred prefixes in area code 619, which serves San Diego, California, and some nearby communities. See the NANPA website to get a current list of all prefixes in area code 619: <http://www.nanpa.com/enas/coCodeReportPost.do?reportType=7> and enter the state and NPA (area code).
Area code 586 is Macomb County, Michigan, including the city of Warren. It has far too many prefixes to list here.
Some common phone prefixes in area code 949 include 215, 221, 235, 250, and 273. These prefixes are used by various phone carriers and service providers in the area code 949 region.
As of October 3, 2012, Morristown, IN, has the following prefixes in area code 765: 316, 740, 745, 763, 818.
In North America (USA, Canada, etc.), area code 519 is southern Ontario, Canada, including London and Windsor, in an overlay with area code 226. Area code 548 will be added as a further overlay in 2015. There are more than 700 prefixes in area code 519, far too many to list here.
Portland, Oregon has two area codes. 503 has the largest number of prefixes, totalling 146. Area code 971, the newest overlay area code in Portland, has far fewer. This information is for landlines only, with cellular providers offering even more.
Phone number prefixes in Twentynine Palms, CA typically start with the area codes 760 or 442.
The '00' is a commonly used international access prefix, not part of the area code. Many other countries use different international access prefixes, such as 011 in the US and Canada or 0011 in Australia. Country code +56 is Chile, in South America. Area code +56 32 is Valparaiso.
Area code 415 serves San Francisco and Marin County, California, but there is no 138 prefix. Telephone prefixes in North America (USA, Canada, etc.) cannot begin with 1.