Magistrate Judge 410 Walnut St Yankton, SD 57078 Phone : (605) 668-3090 Business Category State Courts County Government-Courts Courts South Dakota State Of--yankton, Law Trained Magistrate 5 Walnut Yankton, SD 57078 Phone : (605) 668-3090 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools South Dakota State Of--law-trained Magistrate 5th & Walnut Yankton, SD 57078 Phone : (605) 668-3090 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools