The 213 area code is part of the United States and mainly serves downtown Los Angeles. This was one of the very first area codes set up back in 1947. The 213 code, which is now only assigned to the central business district and nearby areas, had to be reduced because of the ever-increasing population and the addition of new area codes. Nowadays, 213 is coexisting with 323, an overlay area code, so both numbers can be used in the same region. In fact, the 213 area code is synonymous with downtown Los Angeles and is known as the location of the city's historic core.