Bedrift J - Gran
- Jobb
- Jomato AS
- Jarenvatnet Grunneierlag
- Johnet Datasystemer AS
- Janicke Horgen
- Jevnaker Almenning
- Jorstad IT
- Johnet Eiendom AS
- Jos - Eiendom AS
- Johnny Bergstrøm
- Jon Ekeren
- Jernbanegaten 8 AS
- Janne Asprusten
- Jørgen Brænden
- Jysk Gran
- Jan Egil Gulden
- Johansen Leif Tore
- Jonas Raabe Production
- J.P. Prestkvern
- Jarhaugvegen 10 Sameie
- Jarhaugvegen 10 Sameie
- Julie Wilhelmsen Woxen
- John Magne Rikoll
- Jul Tore Kittelsrud
- Jan Arild Hammer
- Jan Olav Eidsand
- Janne Hea Svebakken
- Jes Helmenbakken Holding AS
- Jølstad begravelsesbyrå avd. Gran
- Johansen Roy Mårten
- Janomi Jan Midthus
- Jensen & Hammersbøen AS
- Jonassen Maskin og Vedlikehold
- Jevnaker Alm Sagbr Høvleri
- Jrs Expresstransport V/ Sinthuja Jeyakumar
- Jobb Deg Blid - Ny Energi Edvardsen