- Hafan Saff Cyf5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48
- Han Sing4Takeaway/sandwich shopMerthyr TydfilCF48 3LT
- Harry's Plaice4Takeaway/sandwich shopMerthyr TydfilCF48 3SH
- Harvester4Restaurant/Cafe/CanteenMerthyr TydfilCF48 1UT
- Heddfan Residential Home3Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 1TD
- Hendersons Newsagents5Retailers - otherMerthyr TydfilCF48 3RW
- Heolgerrig Community School5School/college/universityMerthyr TydfilCF48 1SB
- Heolgerrig Out of School Club5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 1SB
- Heolgerrig Post Office5Retailers - otherMerthyr TydfilCF48 1RP
- Heolgerrig Social Club5Pub/bar/nightclubMerthyr TydfilCF48 1RP
- Here We Grow Day Nursery5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 1AR
- Hills Plymouth Cricket Club4Pub/bar/nightclubMerthyr TydfilCF48 4BJ
- Ho Wah3Takeaway/sandwich shopMerthyr TydfilCF48 3HB
- Home Bargains5Retailers - supermarkets/hypermarketsMerthyr TydfilCF48 4TQ
- Horizn Fitness5Restaurant/Cafe/CanteenMerthyr TydfilCF48 2SR
- Iceland5Retailers - supermarkets/hypermarketsMerthyr TydfilCF48 4TQ
- Juggy's Plaice5Takeaway/sandwich shopMerthyr TydfilCF48 1LE
- K.F.C.4Restaurant/Cafe/CanteenMerthyr TydfilCF48 1HY
- KV’s5Retailers - otherMerthyr TydfilCF48 1ND
- Kam Wah4Takeaway/sandwich shopMerthyr TydfilCF48 2BY
- Kaneschar Stores4Retailers - otherMerthyr TydfilCF48 1SJ
- Kepak - Merthyr4Restaurant/Cafe/CanteenMerthyr TydfilCF48 2TA
- Kepak Ltd / St Merryn'sExemptManufacturers/packersMerthyr TydfilCF48 2TA
- Keyvapours LTDExemptRetailers - otherMerthyr TydfilCF48 1HT
- Knights Chemist LtdExemptRetailers - otherMerthyr TydfilCF48 3AL
- Kooler Nightclub5Pub/bar/nightclubMerthyr TydfilCF48 1AY
- LA BOCATA5Restaurant/Cafe/CanteenMerthyr TydfilCF48 1AY
- Lady Charlotte Cafe4Restaurant/Cafe/CanteenMerthyr TydfilCF48 3EH
- Lauren Flynn T/A Llwyn Yr Eos5Other catering premisesMerthyr TydfilCF48
- Lemon Pepper HoldingsAwaitingRestaurant/Cafe/CanteenMerthyr TydfilCF48
- Lidl5Retailers - supermarkets/hypermarketsMerthyr TydfilCF48 2TA
- Lifestyle Express3Retailers - otherMerthyr TydfilCF48 1DR
- Little Acorns @ Ysgol Y Graig5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 2RD
- Little Inspirations @ Gellideg5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 1ND
- Little Lambs - Pentrebach4Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 4DR
- Little Learners - Pantysgallog Ltd5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 2AD
- Little Rascals Pre-School5Hospitals/Childcare/Caring PremisesMerthyr TydfilCF48 4BJ
- Llwyn Onn Guest House5Hotel/bed & breakfast/guest houseMerthyr TydfilCF48 2HT
- Llwyn-yr-Eos Inn4Pub/bar/nightclubMerthyr TydfilCF48 1AX
- Londis4Retailers - otherMerthyr TydfilCF48 3LT
- Love Food4Takeaway/sandwich shopMerthyr TydfilCF48 3HB
- Lucky Leprechaun Ltd T/A The Celtic Bar5Pub/bar/nightclubMerthyr TydfilCF48 1AY
- Maddys5Retailers - otherMerthyr TydfilCF48 1HT
- Mango House3Restaurant/Cafe/CanteenMerthyr TydfilCF48 2PN
- Marmaris kebab3Takeaway/sandwich shopMerthyr TydfilCF48 3HB
- Maxis Fruit & VegAwaitingMobile catererMerthyr TydfilCF48
- Mcdonald's5Restaurant/Cafe/CanteenMerthyr TydfilCF48 1UT
- Mcdonald's5Restaurant/Cafe/CanteenMerthyr TydfilCF48 1HY
- Merthyr Motor Auctions (MMA)5Restaurant/Cafe/CanteenMerthyr TydfilCF48 3SH
- Merthyr Rugby Football Club4Restaurant/Cafe/CanteenMerthyr TydfilCF48 1AF