Start by going to Pima County MapGuide Maps. Review the introductory links on that page and then pick "Main MapGuide Map" to see the main map and then get started with MapGuide:
33 N. Stone Ave., 15th Fl. Mail-Stop Code DTBAB17-425 Tucson, AZ 85701 Phone: (520) 724-6670 Fax: (520) 791-6588