| L A G Ceilings Ltd - Other building completion |
| L D Gevertz - Dental practice activities |
| L G Bland E & M Ltd - Installation of electrical wiring and fittings |
| L G Bland E & M Ltd - Installation of electrical wiring and fittings |
| L G Bland Ltd - Installation of electrical wiring and fittings |
| L J Watson - Medical practice activities |
| Lake Associates - Technical testing and analysis |
| Lams - Restaurant |
| Lea Valley Shooting Association - Operation of sports arenas and stadiums |
| Lead Media Ltd - Advertising |
| Learning Disability Service - Social work activities with accommodation |
| Lee House Chinese - Restaurant |
| Legion X1111 - Adult and other education not elsewhere classified |
| Leuigi Hand Carwash - Maintenance and repair of motor vehicles |
| Little Angels Nurseries Ltd - Primary education |
| Little Berkhamstead Cricket Club - Operation of sports arenas and stadiums |
| Little Miss Parties - Artistic and literary creation and interpretation |
| LloydsPharmacy - Pharmacy |
| Lloyds TSB Bank PLC - Bank |
| Loadsa Tools Ltd - Wholesale of machine tools |
| Lock Stock & Barrell - Investigation and security activities |
| Longmores - Legal activities |
| Lussmanns Eatery - Restaurant |
| LH Gas - Plumber |
| Lions Den Motorcycles - Motorcycle Dealer |
| Lindsay sweets - Store |