Sioux City--iowa State Of, National Guard Of Iowa, Headquarters Army National Guard 3200 Remington Ave Sioux City, IA 51111 Phone : (712) 252-4347 Business Category Government Offices-State Government Offices State & Local Government Offices & Public Schools National Guard Headquarters 3200 Remington Ave Sioux City, IA 51111 Phone : (712) 252-4347 Business Category National Security