Pirate's Cove Diving Inc. -
 Milwaukee based dive center features Lake Michigan dive charters and diving classes.
http://www.pcdiving.com/

Reefpoint Diving Center -
Instruction is emphasized on this Racine dive shop's website.
http://reefpointdiving.com/

Shoreline Resort -
 Rates, wreck data, contact information for this Gill's Rock based charter service.
http://www.theshorelineresort.com

Silent World Divecenter -
 PADI 5 Star facility in Sheboygan. Equipment, classes, travel and activities.
http://www.silentworld.com

St. Croix Scuba -
 Dive center located in Hudson, information includes local dive sites and fun dives on Lake Superior shipwrecks.
http://www.stcscuba.com/

Three Little Devils, Inc. -
 Baraboo area PADI Instructor Development Center website features include a newsletter, dive travel, equipment sales and service information.
http://www.3littledevils.com

Timber Bay Sport and Dive -
 Located near Minocqua/Woodruff, year round PADI dive center offering diving and kayak equipment sales, rental, classes, Nitrox and dive and kayak excursions.
http://www.timberbay.net

Underwater Adventures, LLC -
 Menomonie based dive center with information on PADI instruction and vacation travel, and an online newsletter.
http://www.uwascuba.com/