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 Related Posts Area Code 712 Area Code 859 Area Code 318 Area Code 541 Area Code 775 Area Code 507 Area Code 706 Area Code 218