| Chris Reeve Photographer | Commercial photographer | Studio 213 [SPACE, 37 Queen St | Mon–Fri 08:00–17:30 |
| Church Street Tavern | Modern British restaurant | 3 Church St | Wed–Thu 10:30–23:00 |
| Churchgate Ear Clinic | Audiologist | The St | Mon 09:00–17:00 |
| Cloudit Bookkeeping Ltd | Bookkeeping service | 44 Mayfly Wy | Mon–Fri 09:00–17:00 |
| Clout.Media | Video production service | 18 Holly Way | Mon–Fri 10:00–20:00 |
| Club Forty Personal Styling | Stylist | 28 Richard Ave | Mon–Fri 09:00–18:00 |
| CNC Park Home Services | Building restoration service | 178 Grove Rd | Daily Open 24 hours |
| Cobb Europe Ltd | Agriculture | Severalls Business Park, 770 The Crescent | Wed–Thu 08:30–17:00 |
| Coffeelink Ltd | Coffee store | Station Rd | Mon–Fri 05:30–18:00 |
| Coke Gearing Consulting | Commercial property estate agent | Suite 3, The Treble Tile, Colchester Rd | Mon–Fri 09:00–17:30 |
| Colchester Auto Repairs | Mechanic | Newbridge farm | Mon–Fri 09:00–17:00 |
| Colchester Auto Solutions | Oil change service | Unit 6, Moorside Business Centre | Fri 09:30–17:30 |
| Colchester Carpets & Flooring | Carpet retail shop | 15-19 Headgate | Mon–Fri 09:30–17:00 |
| Colchester Cat Rescue | Animal rescue service | Lyndhurst, Bromley Rd | Mon–Fri 10:00–16:30 |
| Colchester Dental Implant and Oral Surgery Centre, 12 Creffield Road | Dental implants periodontist | 12 Creffield Rd | Mon–Fri 09:00–17:00 |
| Colchester Eye Doctor – Private Ophthalmologist | Eye care clinic | Turner Rd | Fri 09:00–21:00 |
| Colchester Foodbank | Foodbank | 3 Tollgate Retail Park, Tollgate W | Mon–Sat 10:00–14:00 |
| Colchester Indoor Bowls Club | Bowling club | 23 Fitzgilbert Rd | Mon–Sat 08:30–23:00 |
| Colchester Makerspace | Art studio | Trinity Works, 24 Trinity St | Daily Open 24 hours |
| Colchester Shotokan Karate Club | Martial arts | Colchester Academy Sports Centre, Hawthorn Ave | Tue 19:00–20:30 |
| Colchester Turf | Turf and soil supplier | Karita, Main Rd | Mon–Fri 07:30–18:00 |
| Colne Heating | Gas engineer | 3, Colne View Cottages, Abberton Rd | Mon–Sat 08:00–18:00 |
| Colne House Care Home | Retirement home | Station Rd | Sat–Sun Open 24 hours |
| Colne Valley Chimney Sweep | Chimney sweep | 24 York Rd | Mon 07:00–19:00 |
| Colne Valley Luxury Mobile Toilets | Portable toilet supplier | Colne Engaine, Colchester CO6 2JL | Mon Open 24 hours |
| Connors Legacy Dog Behaviourist Psychologist & Trainer | Dog trainer | Legacy House, Friday Woods | Sun 10:00–22:00 |
| Correct Osteo Clinic | Osteopath | 8, Godbolts Business Park, Coggeshall Rd | Mon 08:00–19:00 |
| CRP Carpentry | Kitchen supply shop | Bures Rd | Mon–Fri 09:00–16:30 |
| Cudmore Grove Country Park | Country park | The Leys, Broman's Ln | Daily 08:00–17:30 |
| Cute Couture Baby Boutique | Children's clothes shop | 74 Church Rd | Tue 10:30–16:00 |