Auckland- Firth Industries LtdEast Tamaki
- Firth National Support OfficeGreenlane
- Firth Dricon LtdTuakau
- Hume Pipeline Systems Ltd
- Humes Drainage & Watermain CentrePapakura
- W Stevenson & Sons Ltd Building SuppliesWhangaparaoa
Bay of Plenty- Firth Industries LtdMangakakahi
- Firth Stresscrete
Canterbury- Firth Certified Concrete LtdAshburton
- Firth Certified Concrete LtdOrari
- Firth IndustriesPapanui
- Firth Certified Concrete LtdOamaru
- Hynds Pipe Sytems Ltd
- Iplex Pipeline Ltd
Hawke's Bay- Firth Industries Ltd (Area Office)Napier
- Firth Industries Hawkes Bay RegionalNapier
- Hume Industries LtdFernhill
Manawatu- Firth Stresscrete ManawatuBulls
- Firth Industries LtdPalmerston North
- Firth Palmerston North Certified ConretePalmerston North
Marlborough- Firth Industries LtdBlenheim
Nelson- Firth Industries LtdRichmond
Northland- Firth Industries
- Firth IndustriesKaitaia
- Firth Industries LtdPaihia
- Firth Industries LtdWaipu
Otago- StresscreteCromwell
- Firth IndustriesWanaka
- Firth Industries LtdGreen Island
- Otago Tiles Ltd
Southland- StresscreteInvercargill
- Firth Industries LtdInvercargill
Taranaki- Firth Certified Concrete LtdHawera
- Firth Industries LtdStratford
Waikato- Airstone Designer MasonryTe Rapa
- Bowers Brothers ConcreteMorrinsville
- Firth Certified Concrete LtdThames
- Firth Industries LtdTokoroa
- Firth Industries LtdWaihi
- Firth Certified Concrete LtdWhangamata
- Paeroa ConretePaeroa
- Placemakers FirthHamilton
- StresscreteTe Rapa
- Thomson Concrete LtdTaumarunui
Wellington- Firth Wellington - Belmont Certified ConcreteHutt City
- Firth KapitiParaparaumu
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