Area code 405 serves central Oklahoma, including the state capital of Oklahoma City and nearby suburbs such as Edmond, Norman, and Moore. It is one of the original area codes established in 1947 and historically covered the entire state before being split to form 918 and 580. Due to population growth, it was overlaid by area code 572 in 2021, requiring ten-digit dialing. Oklahoma City, the largest city in the state, drives the 405 region’s economy, which includes energy, aviation, and government. The code is a prominent symbol of Oklahoma pride and metropolitan growth.