| Commercial Signs |
| Communications |
| Community Groups & Organizations |
| | Association of Information Technology Professionals |
| | Big Brothers and Big Sisters of Sheboygan County |
| | Elkhart Lake Area Chamber of Commerce |
| | Kiwanis Club of Greater Sheboygan |
| | The Lakeland Attack Volleyball Club |
| | Literacy Council of Sheboygan, Inc. |
| | Plymouth Snow Rangers |
| | Sheboygan County Fair Association |
| | Sheboygan County Historical Research Center |
| Community Newsletters |
| Compact Discs, Tapes & Recorders |
| Compressors |
| Computer Aided Publishing |
| Computer Books and References |
| Computer Consultants |
| | Excellent Computers |
| | Patheon Consulting |
| Computer Graphics |
| Computer Online Services |
| | Excel.Net, Inc. |
| Computer Programming |
| Computer Repair |
| | Excellent Computers |
| Computers & Equipment |
| | Excellent Computers |
| Computers & Equipment - Used |
| Computers - Designers & Consultants |
| | Summ-Tech, Inc. |
| Computers - Networking |
| | Excellent Computers |
| | Patheon Consulting |
| Computers - Software & Instruction |
| | Hoogstra-Uraynar CPA |
| | Innovative Solutions |
| Computers Supplies |
| | Excellent Computers |
| | SEMCO |
| Concrete Blocks |
| Concrete Contractors |
| | Kammerzelt Concrete, Inc. |
| Concrete Ready Mixed |
| Condominiums |
| Conference Planners |
| | Ryan Resource, Inc. |
| Construction |
| | Gabes Construction Co., Inc. |
| | Hamann Construction |
| | Lentz Custom Homes, Inc. |
| | Liermann Construction, LLC |
| | Moraine Builders, Inc. |
| | Timber Guides |
| | TW Carpentry |
| Consultants |
| | A.C.T. |
| | EcoManity LLC |
| | Miller Engineers & Scientists |
| | Window of Opportunity |
| Contact Lenses |
| Contractors |
| | AJ Construction of WI |
| | Gabes Construction Co., Inc. |
| | Hamann Construction |
| | Precision Roofing Services Inc |
| | TJS Asphalt |
| Controls |
| | Castle Controls & Automation |
| Convenience Stores |
| Cooking Instruction |
| | Wisconsin School of Cookery |
| Cookware |
| | Regal Ware, Inc. |
| Copying & Duplicating Service |
| | Sun Graphics |
| Copy Machines - Sales & Service |
| Cosmetics |
| | Gina Steinhardt, Beauty Consultant |
| Costumes |
| Country Wood Furniture |
| | The Maple Tree |
| Craft Products/Supplies |
| | Ashwood Canine Services |
| | Rockin M Ranch Crafts |
| | Wood 'N Crafts |
| Credit & Debt Counseling |
| Credit Unions |
| | Meadowland Credit Union |
| | Midwest Credit Union |
| Cremation Services |
| | Lippert Funeral Home |
| Cruises |
| | Carlson Wagonlit Travel |
| Custom Apparel |
