| Jubilee Restaurant | Breakfast restaurant | Old Ipswich Rd | Wed–Sat 08:00–14:00 |
| Jungle Adventure Ltd | Children's amusement centre | Stanway Retail Park, Peartree Rd | Daily 09:30–17:30 |
| Kids Clothing Wholesale | Clothing wholesaler | Unit A, Purley Farm Barns | Daily Open 24 hours |
| Kids' Therapy Works Ltd. | Physiotherapist | Barn 2, Green Farm Barns, School Rd | Mon–Sat 09:00–17:00 |
| Knight Weddings | Wedding planner | 21 Ingrams Piece | Daily Open 24 hours |
| Layer Marney Horse Drawn Carriages | Carriage ride service | Farm Clears Rd | Daily Open 24 hours |
| Lowkey Media | Video, Photo & Media Services | Video editing service | 9 Lord Holland Rd | Daily 09:00–17:00 |
| M'SH Holistic Therapies | Reflexologist | 4 New Ln | Mon–Fri 18:00–21:00 |
| MaidClean4You | Pressure washing service | Princess Dr | Daily 08:00–20:00 |
| Marks Tey Discount Petfoods | Pet care store | 90 Coggeshall Rd | Mon–Tue 09:00–17:30 |
| Mattressman | Bedroom furniture store | Stanway Retail Park, Peartree Rd | Mon–Sat 09:00–17:30 |
| McLauchlans of Boxted Fruit Farm | Farm shop | 53 Straight Rd | Mon–Sat 09:00–17:00 |
| Mercedes-Benz of Colchester | Mercedes-benz dealer | London Rd | Mon–Fri 08:00–18:30 |
| Mersea Island Watersports | Water sports equipment rental service | 110 Coast Rd | Sun 10:00–16:00 |
| MJH Floor Sanding | Floor sanding and polishing service | Warden House, 37 Manor Rd | Daily Open 24 hours |
| Mjs Security Systems - Alarms - Cctv - Intercoms - Gate Automation Essex | Security system installation service | Unit 10 Old Shields Farm, Waterhouse Ln | Daily Open 24 hours |
| Moonstone Head Spa | Day spa | 32 Sandmartin Cres | Tue–Thu 10:00–21:00 |
| Morgan Marine | Marine broker | The Boatyard, Copperas Rd | Daily 09:00–17:30 |
| MotorHub District | Motor vehicle dealer | Unit 4, Orchard Business Units | Mon–Fri 07:00–20:00 |
| Munro Bakes ~ Luxury Wedding Cakes Essex | Wedding cake shop | 288 Cowdray Ave | Mon–Fri 08:00–20:00 |
| Naka Thai | Thai restaurant | Naka Thai Restaurant, Haven Rd | Wed–Sun 12:00–15:00, 17:00–22:00 |
| Netmiles | Motor vehicle dealer | Kemps Farm, Mersea Rd | Mon–Fri 08:30–19:00 |
| No 1 Harbour Square. eat.drink.relax | Bar | Harbour Sq | Mon–Thu 11:00–17:00 |
| olies repairs | Lawn mower repair service | 21 Newtown | Daily 08:00–18:00 |
| Pausa Cafe | Tea shop | Rise Retail Park, Turner, Petrolea Cl | Mon–Sat 09:00–17:00 |
| Payzone | Courier service | 38 Queen St | Daily 07:00–23:00 |
| Peach Guitars | Guitar shop | 3 Crown Gate Wyncolls Road Severalls Industrial Park | Mon 10:00–17:30 |
| Philippe Jacquet & Associates | Psychiatrist | 7 Wellesley Rd | Mon 08:00–20:30 |
| Pizza Hot 4 You | Pizza delivery | 22A East Hill | Mon–Thu 16:00–23:30 |
| Plummer Electrical Engineering | Electrical engineer | Plough Farmhouse, Plough Road, Great Bentley, Essex | Daily Open 24 hours |