Area Code 414 January 18, 2021 allcitycodes Telephone Codes 0 Where is area code 414 located? Below you will find a list of all cities covered by area code 414 in Wisconsin. Caledonia, WI Cudahy, WI Franklin, WI Greendale, WI Hales Corners, WI Helenville, WI Oak Creek, WI Palmyra, WI South Milwaukee, WI