| CLA (CliftonLarsonAllen) | Accounting firm | 2424 Monetary Blvd Ste 205 | Mon–Fri 8 AM–5 PM |
| Clapp Waterfowl Protection Area | Nature preserve | I-94 | Fri 6 AM–10 PM |
| Classy Nail Polish | Hairdresser | 1516 Summer St | Mon–Thu Open 24 hours |
| Cliffs Pools and Spas | Swimming pool repair service | 932 Chippewa Path | Fri 9 AM–5 PM |
| Clymer Lawn and Landscaping | Lawn care service | 15 Cliff Ridge Ct | Mon–Fri 9 AM–6 PM |
| Coldwell Banker Realty - Hartstein Neuhaus Team | Real estate agency | 2424 Monetary Blvd Suite 214 | Fri 7 AM–11 PM |
| Coldwell Banker Realty - Hudson | Real estate agency | 2424 Monetary Blvd Suite 214 | Mon–Fri 9 AM–5 PM |
| COLE SIREK-RE/MAX Results Realtor | Real estate agent | 375 Stageline Rd | Thu 7 AM–9 PM |
| Collateral Property Management LLC | Property management company | 226 Locust St Ste 42 | Fri Open 24 hours |
| Comfort by Design | Air conditioning contractor | 1600 Maxwell Dr | Daily Open 24 hours |
| Comfort Keepers Home Care | Home health care service | 865 Hartman Circle Suite 107 | Daily Open 24 hours |
| Complete Lawn Care | Lawn care service | 744 Ryan Dr #103 | Mon–Thu 8 AM–5 PM |
| Computer Repair & Services | Computer repair service | 2103 Coulee Rd | Mon–Fri 9 AM–6 PM |
| Consumer Direct Care Network Wisconsin | Home health care service | 744 Ryan Dr #201 | Mon–Fri 8 AM–5 PM |
| Coordinated Business Systems | Office equipment supplier | 2521 Hanley Rd | Mon–Fri 8 AM–5 PM |
| Copperbrook Labs Inc | Database management company | 1220 8th St | Fri 8 AM–5 PM |
| Core & Main | Water works equipment supplier | 637 Commerce Dr | Fri 7 AM–4:30 PM |
| Corey Fanning, RE/MAX Results | Real estate agent | 375 Stageline Rd #200 | Daily Open 24 hours |
| Cornerstone Church | Church | 1024 4th St | Mon 9 AM–11 AM |
| County Market Pharmacy | Pharmacy | 2310 Crest View Dr | Mon–Fri 8 AM–8 PM |
| CPR Cell Phone Repair | Mobile phone repair shop | 2270 Badger Dr | Mon–Wed 10 AM–7 PM |
| Crabtree Jewelry | Jewelry store | 2424 Monetary Blvd | Wed–Thu 10 AM–5 PM |
| Credit Service International | Debt collection agency | 512 2nd St #6 | Mon–Fri 8 AM–6 PM |
| Crimson Valley Construction Co. | General contractor | 634 Commerce Dr F | Mon–Fri 8 AM–5 PM |
| Crisp & Green | Health food restaurant | 901 Pearson Dr | Fri 8 AM–9 PM |
| Croix Crystal Water Treatment | Water softening equipment supplier | 3440 Yoerg Dr | Wed 8:30 AM–4:30 PM |
| Croix Gear | Machine shop | 1651 Hanley Rd | Fri 7 AM–4 PM |
| Croix Valley Construction | Concrete contractor | 1037 Pheasant Trail | Fri 6:30 AM–7 PM |
| Croix Valley Foods | Manufacturer | 2320 Jack Breault Dr | Fri 9 AM–5 PM |
| Croix View Construction & Remodeling | Bathroom remodeler | 499 Country View Rd | Mon–Fri 8 AM–6 PM |
| Crow Custom Cast Welding | Welder | 364 Ruthie Ln | Mon–Fri 9 AM–5 PM |
| Crumbl Cookies | Cookie shop | 1020 Pearson Dr Ste E | Mon–Sat 8 AM–10 PM |
| CV Exteriors Hudson | Roofing contractor | 408 2nd St | Mon–Fri 8 AM–4 PM |
| Dan Payne Real Estate | Real estate agency | 2424 Monetary Blvd Suite 214 | Mon–Fri 8 AM–6 PM |
| DaVita Hudson Dialysis | Dialysis center | 421 Stageline Rd | Mon 5 AM–8 PM |
| Daymakers Moving and Storage | Mover | 588 Schommer Dr | Mon–Fri 8 AM–5 PM |