| Clearear by Holly - Ear Wax Removal Swansea | Audiologist | Maes-Yr-Haf | Mon–Fri 08:00–19:00 |
| Click Digital Growth | Web designer | First Floor | Mon–Fri 10:00–17:00 |
| Clydach Glass & Glazing | Double glazing installer | 21 High St | Mon–Fri 09:00–17:00 |
| Clyne Golf Club | Golf club | 118-120 Owls Lodge Ln | Mon–Sat 07:30–23:30 |
| Co-op Food - Killay | Supermarket | 434 Gower Rd | Mon–Sat 06:00–22:00 |
| Colwyn Avenue Post Office | Post office | 143 Colwyn Ave | Mon–Sat 08:00–18:00 |
| Comix Shoppe | Comic book shop | 13 Shoppers Walk | Mon 10:00–14:00 |
| Convrg | Internet marketing service | TechHub | Mon–Fri 09:00–17:00 |
| Copper Jack | Tour operator | the Helwick Lightship, Victoria Quay Adjacent | Mon 11:00–15:20 |
| Core Body Clinic | Physiotherapist | 110 Walter Rd | Mon 08:00–18:00 |
| Cosgrove Brown Financial Planning Limited - Chartered Financial Planners | Investment service | Unit 1 (GF), Dragon 24, Penllergaer Business Park | Mon–Fri 09:00–17:00 |
| Craven Catering Limited | Commercial refrigerator supplier | Unit 1, 304 Carmarthen Rd | Mon–Fri 08:00–16:00 |
| Craven Cooling | Commercial refrigerator supplier | 304 Carmarthen Rd | Mon–Fri 08:00–16:00 |
| Crazyclimb Swansea | Indoor playground | Unit 5b, Parc Tawe, Parc Tawe Retail Park | Mon–Fri 10:00–19:00 |
| Crescent Dental Ltd | Dentist | 24 Uplands Cres | Thu 08:00–13:00, 14:00–17:00 |
| Crossroads Clinic Ltd | Chiropodist | 82 High St | Mon–Tue 08:30–13:00, 14:00–16:30 |
| Crumbs Kitchen Uplands | Vegetarian restaurant | 2 Gwydr Square | Mon–Sat 08:00–16:30 |
| Crush Mens Outfitters | Formal menswear shop | Concept House, St John's Rd | Mon–Sat 10:00–17:00 |
| Curry House | Indian restaurant | 10 Wern Rd | Mon 16:30–21:30 |
| Cutis Cosmetic Clinic | Plastic surgeon | 395 Gower Rd | Mon–Fri 09:00–17:00 |
| Cwmtawe Medical Group | Doctor | 80 High St | Mon–Fri 08:30–18:00 |
| D&D Home Maintenance Solutions | Property maintenance | 24 Bryn Aeron | Mon 08:00–17:30 |
| D.G.Heath Timber Products | Timber merchant | Industrial Estate, Unit 3 Tyn Y Bonau Rd | Mon 08:00–17:00 |
| Dacia Swansea | Dacia dealer | Fendrod Way, Enterprise Park, Fendrod Way | Mon–Fri 08:00–18:00 |
| Dancer Engineering | HVAC contractor | 7 Saunders Way | Mon–Fri 08:00–17:00 |
| Darren Francis Antiques and Collectables | Antique shop | 146 Alexandra Rd | Mon–Tue 09:00–20:00 |
| David Michael Jewellers Ltd | Jeweller | 114 Woodfield St | Mon–Sat 10:00–17:00 |
| Day's Rental | Gorseinon | Car rental company | Swansea Rd | Sat 08:00–12:30 |
| Days Mobility & A1 Hygiene | Mobility equipment supplier | 46 Gendros Cres | Mon–Fri 09:00–17:00 |
| Deccan Flavours Swansea | South Indian restaurant | 68 St Helen's Rd | Mon–Fri 12:00–23:00 |