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| JOKERHUS BYGG AS | 974988577 | STAVANGER |
| JØLLE & KRISTENSEN AS | 916872860 | TRONDHEIM |
| JØLSTAD MASKIN AS | 929228251 | NESODDEN |
| JØLSTER BETONGBYGG AS | 981902467 | SUNNFJORD |
| JØLSTER BYGG OG INTERIØR AS | 933532496 | SUNNFJORD |
| JOMEK SVEIS AS | 992256001 | GJERDRUM |
| J.O. MOEN ANLEGG AS | 981240839 | RAUMA |
| JONARK AS | 992618590 | NAMSOS |
| JON ARNE LANGØRGEN AS | 913561090 | TRONDHEIM |
| JON ARNE SEKSE | 914626765 | ULLENSVANG |
| JON AS | 971194456 | TRONDHEIM |
| JONAS ENGESETER | 916257635 | SOGNDAL |
| JONASSEN RØRSERVICE AS | 984223722 | HAMMERFEST |
| JONAS THOR AS | 929468880 | STAVANGER |
| JON DAHLE BYGG AS | 980285286 | GJERDRUM |
| JONDAL BYGG AS | 919913894 | ULLENSVANG |
| JONDAL MASKIN & TRANSPORT AS | 999562787 | ULLENSVANG |
| JON ERIK MEDALEN | 971507594 | SIGDAL |
| JONES ARKITEKTER AS | 943567042 | BÆRUM |
| JON HAUGLAND BYGG AS | 925795097 | ASKER |
| JON HILLESTAD | 855078392 | SOGNDAL |
| JØNHOLT GRAVESERVICE V/ROY JØNHO | 969964023 | PORSGRUNN |
| JON L SÆTER AS | 974495929 | SUNNDAL |
| JONNY LARSEN RØRLEGGERBEDRIFT AS | 980169421 | DRAMMEN |
| JONNY LILLESTRØM AS | 885271022 | GJERDRUM |
| JONNY TUVSJØEN AS | 992831855 | HOLE |
| JON SÆTER AS | 912531147 | KRISTIANSUND |
| JON'S BYGG OG TAKST AS | 924324309 | LOM |
| JON STRAND AS | 984867212 | SØR-FRON |
| JON TORE SAND AS | 819154082 | ASKER |
| JOP BYGG AS | 830466142 | ALTA |
| JØRA BYGG HUS OG HYTTER AS | 933913562 | GAUSDAL |
| JORA MASKIN AS | 981888057 | DOVRE |
| JORDALEN ENTREPRENØR AS | 975930017 | VOSS |
| JORDALEN MASKIN AS | 895454532 | VOSS |
| JORDBREKK FORSKALING AS | 989298631 | SOLA |
| JORDET ELEKTRO AS | 989368737 | OSLO |
| JORDET GRUSTAK AS | 982193370 | ORKLAND |
| JØRGENSEN AS | 930827142 | OSLO |
| JØRGENSEN OG JØRGENSEN AS | 932086158 | FREDRIKSTAD |
| JØRGEN ULLERN BYGG & ANLEGG AS | 926882406 | HOLE |
| JØRN GARVIK | 994279750 | SANDNES |
| JØRN KONRAD BYE AS | 998014867 | KRØDSHERAD |
| JØRN NIKOLAISEN | 996784754 | HAMAR |
| JØRNSEN TAK AS | 971644486 | DRAMMEN |
| JØRN SKJØRDAL | 970551468 | HOLMESTRAND |
| JØRN STORBERGET AS | 998560179 | LIER |
| JØRN WALSETH | 970132619 | LØRENSKOG |