U
| U.S. Cellular One | Waukesha |
| Ultimate Assistants | Milwaukee |
| Ultra Tool & Manufacturing, Inc. | Menomonee Falls |
| UltraServ Corporation | Menomonee Falls |
| Unico, Inc | Franksville |
| Union Cab | Madison |
| Union Copy Centers, Inc. | Milwaukee |
| United Airlines | |
| United P&H Supply Company | Milwaukee |
| United Parcel Service | |
| United Water Services | Milwaukee |
| Universal Brixius, Inc | Milwaukee |
| Universal Silencer | Stoughton |
| Up-N-Atom, Inc. | Waukesha |
| The UPS Store | Brookfield |
| Urban Ecology Center | Milwaukee |
| Urban Taylor & Stawski Ltd. | Milwaukee |
| US Bancorp | Minneapolis, MN |
| USAV Group | New Berlin |
| USFilter’s Envirex Products | Waukesha |
| USXchange Directories, L.L.C. | Milwaukee |
| Utility Sales and Service, Inc. (USSI) | Appleton |
| Uvulittle Records | |
| UW Hospital and Clinics and UW Children’s Hospital | Madison |
V
| Vacation Property Specialists | Janesville |
| Valkyrie Co. | |
| Valley Packaging Industries | Appleton |
| Valuation Research Corporation | Milwaukee |
| Van Hollen Realty | Iron River |
| The Van Wyhe Group | Waukesha |
| Vaughn Enterprises, Inc. | Appleton |
| Velvac Inc. | New Berlin |
| Venturedyne Ltd. | Milwaukee |
| Venus Graphics Corp. | Verona |
| VerHalen, Inc. | Green Bay |
| Verizon | |
| Vernal Management Consultants, LLC | Milwaukee |
| Vernon Roche Hodgson, Inc. | Milwaukee |
| Versa-Bar | Waukesha |
| Viasystems Milwaukee, Inc. | Oak Creek |
| Victoria Jones Strategic Marketing Communications | Madison |
| Victory Personnel Services | Milwaukee |
| VideoStory | Milwaukee |
| Viking Cue | Madison |
| Vilter | Cudahy |
| Virchow Krause Stafford Waller | Madison |
| Virtual Properties | Madison |
| Visicomm Industries | Racine |
| Visual Systems Inc. | Milwaukee |
| Visuality | Madison |
| VitalWave Technologies, LLC | Whitefish Bay |
| Vivid Media | Madison |
| Vizid Brand Engineering | Milwaukee |
| Voith Paper Inc. | Appleton |
| The Vollrath Co., L.L.C. | Sheboygan |
| Von Briesen & Roper S.C. | Milwaukee |
| Voodoo Creations.com | Cape Coral, FL |
| Vrakas, Blum & Co., S.C. | Brookfield |
| Vulcan Industries Corporation | Germantown |
| Vulcan Lead, Inc. | Milwaukee |
| Vyron Corporation | Brookfield |
