South Dakota | North Sioux City | St. Luke's Occupational Health 224 North Derby Lane North Sioux City, SD 57049 Phone: 877-422-8658 Fax: 402-494-3398 | | Sioux Falls | HEALTHworks Avera Health 4928 N. Cliff Avenue Sioux Falls, SD 57104 Phone: 605-322-5100 | Sioux Valley Clinic Occupational Medicine 3803 North 4th Ave. Sioux Falls, SD 57104 Phone: 605-339-6181 Fax: 605-339-4868 | |