Firma J - Marnardal
- Jovenit AS
- Jordanas Rimeikis
- Jdd Utstyr AS
- JDD Maskin AS
- Jonny Haraldstad
- Joachim Thorvaldsen
- Joker Marnardal
- John Sveinall
- Jdd Maskin AS
- Jarle Olsen
- Jensen gård
- Jarl Manneråk
- Ja-Ko Eiendom AS
- Jørgen Øslebø Knutsen
- Jonn Arild Gill
- Jesper Kvarenes Bjørnestøl
- John Terje Bakken
- J Manneråk Smie & Sveiseservice AS