Firma J - Horten
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- Juicy Donuts Horten
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- Jan-Arne Johansen
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- Jorun Margrethe Gustavsen
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- Janet Inger Sandø-Healey
- Jensen Event Lemonia Eventyr
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- Josol Interiør V/Svein Kirkhaug
- Jeotec Jan Eddy Ottem
- Jennie-Lovise Nordheim Bjerke
- Jonas Sørbye til Stede
- Jordal DJ og Produksjon
- J Olsens Enke Hagesenter AS
- Jehovas Vitner - Horten Menighet
- Jimenez Rørservice AS E.F.
- Jan Erik Hoffmann Thorgersen
- Jan og Hege Raaen A/S
- Just Spey / Tommy Aarkvisla
- Jessica Klær V/Jaswamt Kaur Kumar
- J.O.H.Massasje John Ole Heggtveit