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 Read more:Area Code 718Area Code 815Area Code 810Area Code 816Area Code 812Area Code 804Area Code 813Area Code 715Area Code 770Area Code 719