Area code 478 is a telephone area code serving part of the state of Georgia, in the United States. It covers Macon and central Georgia, including cities such as Warner Robins, Milledgeville, Perry, and Swainsboro. It was formerly part of area code 912, and the new area code, along with area code 229 (for Southwestern Georgia), became effective in 2001 in a 3-way split. The area code covers the following counties: Baldwin, Bibb, Bleckley, Burke (part with area codes 706 and 762), Crawford, Dodge (part with area code 229), Dooly (part with area code 229), Emanuel (part with area code 912), Houston, Jefferson (part with area codes 706 and 762), Jenkins, Johnson, Jones, Laurens, Macon, Monroe, Peach, Pulaski (part with area code 229), Taylor, Twiggs, Upson (part with area codes 706 and 762), Washington, and Wilkinson.