Area code 705 serves northeastern and central Ontario, including cities like Sudbury, North Bay, Barrie, and Peterborough. Introduced in 1957 from a split of 613, it covers a vast and varied area with both urban centers and remote northern communities. The region received overlay area code 249 in 2011 and 683 in 2022, requiring ten-digit dialing. Known for its mining, forestry, and cottage country appeal, 705 remains a primary code for northern Ontario residents and businesses. It’s an essential part of the region’s infrastructure and identity.