What is what area code is 786?

Area code 786 serves the same geographic area as area code 305, which encompasses Miami-Dade County, Florida, including the city of Miami. It is an overlay area code, meaning it was introduced to provide additional telephone numbers when the existing area code (305) was running out of available prefixes. 786 was activated in 1998. Because it's an overlay, callers within the 305/786 area must dial ten digits (area code + phone number) for all calls.