Patient Portal; Contact; Patient Forms. Dr. Dean and Associates > Contact. Contact. ... Child Form Paperwork. Dean & Associates CONTACT INFO. Our Location. 3549 Southern Hills Drive, Sioux City, Iowa 51106. Phone / Fax. Phone: 712-274-6729 Fax: 712-274-6744. Have a question? call us now (712) 274-6729. Fax.