What is what area code is 747?

Area code 747 serves the Los Angeles County area in California, specifically the San Fernando Valley region. It was introduced in 2009 as an overlay for the existing area code 818, meaning that both area codes serve the same geographic area. This overlay was necessary due to the increasing demand for phone numbers in the region. Therefore, in the areas served by area codes 747 and 818, ten-digit dialing is required for all calls. You can read more about this in the San%20Fernando%20Valley article. Also Los%20Angeles%20County information may be useful.