| Greekouzina | Greek restaurant | 157 Friargate | Daily 12:00–21:30 |
| Green Environmental Services | Waste-management service | The Yard, Hopwood St | Daily 08:00–18:00 |
| Guild Lodge | Psychiatric hospital | Guild Lodge | Daily Open 24 hours |
| Gujarat Hindu Society Temple Preston | Hindu temple | Hindu Society and Community Centre, South Meadow Lane Gujarat | Daily 08:00–13:00, 17:00–20:30 |
| H. J. Whalley & Sons Funeral Directors | Funeral director | 2-4 Lowndes St | Daily Open 24 hours |
| Happy Relationship Therapy | Marriage counsellor | Lodge Farm House, Thistleton Rd | Daily 09:00–21:00 |
| Hickory’s Smokehouse Hutton | American restaurant | 86 Liverpool Rd. | Mon–Thu 12:00–22:00 |
| Higher Walton Glass Ltd | Glazier | Kittlingbourne Brow, 1A Kittlingborne Brow | Daily Open 24 hours |
| Hurst Grange Park Play Area | Playground | Hill Rd | Daily 08:00–21:00 |
| ileyfoals | Pony club | 14 Combine Rd | Daily Open 24 hours |
| Imperial Banqueting Preston | Events venue | St Mary's St | Mon–Fri 09:00–21:00 |
| In Focus Brockholes | Optical wholesaler | Preston New Rd | Daily 10:00–16:00 |
| iRepair guys - Phone Shop Preston | Mobile Phone Repair Shop in Preston | Mobile phone repair shop | 42 Fishergate | Mon–Sat 08:30–18:30 |
| iSOUL | Electronics accessories wholesaler | Ribbleton Lane Trading Estate, Unit A2, Harrison, Longworth St | Daily Open 24 hours |
| J C Domestics | Washing machine & dryer repair service | 9 Southgate | Mon–Fri 09:00–19:00 |
| JA Roofing & Son Ltd | Roofing service | 3 Caxton Rd | Daily 07:00–21:00 |
| Jason Rea Magic | Magician | 165 Garstang Rd | Daily Open 24 hours |
| JFN Integrated Solutions Ltd | Fire protection service | Unit B14/15 Ribble Court, Red Scar Business Park, Longridge Road | Daily Open 24 hours |
| Johnson's Muay Thai Gym | Muay Thai boxing gym | 2nd Floor, Maitland Mill, Maitland St | Mon–Thu 06:00–13:00, 16:30–21:00 |
| Jollie's Barn | Children's cafe | The Gravel | Mon–Fri 10:00–17:20 |
| JQ Property & Rentals ltd | Campervan and caravan rental agency | 31 High Mdw | Mon 09:00–17:00 |
| Just Motor Group Citroen Preston | Citroen dealer | 274 Fylde Rd | Mon–Fri 09:00–18:00 |
| K's Timepieces | Watch repair shop | 48 Hassett Cl | Daily Open 24 hours |
| Kingfisher Place - Bloor Homes, Lea, Preston | Housing development | Off Riversway | Daily 10:00–17:00 |
| Kirkham Storage | Removals service | Selby Industrial Estate, Richard St | Daily Open 24 hours |
| KJB Security | Security system installation service | 35 Bexhill Rd | Daily Open 24 hours |
| KokoroYui - Reiki and Oracle Card Readings | Reiki therapist | Fulwood Hall Ln | Mon–Fri 10:30–17:00 |
| KR Samartos Ltd | Tienda de productos africanos | 58 Plungington Rd | Mon–Sat 09:00–21:00 |
| Lancashire Hearing Care | Hearing aid shop | 1 Ruskin St | Daily Open 24 hours |
| Lancashire Wedding Videographer - Julian Voigt Films | Wedding photographer | 18 The Cl | Daily Open 24 hours |