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| 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 BØE | 967295566 | SARPSBORG |
| JONNY LARSEN RØRLEGGERBEDRIFT AS | 980169421 | DRAMMEN |
| JONNY LILLESTRØM AS | 885271022 | GJERDRUM |
| JON SÆTER AS | 912531147 | KRISTIANSUND |
| JØNSBERG VENTILASJON AS | 914974127 | SALTDAL |
| 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 AS | 951104000 | 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 |
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| 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 STORM THORSTENSEN KONSULENTTJENESTER | 864268382 | FÆRDER |
| JØRN WALSETH | 970132619 | LØRENSKOG |
| JOSA BYGG AS | 919653175 | TRONDHEIM |
| JOS BYGG AS | 919515384 | EIDSVOLL |
| JOS EIENDOMSSERVICE AS | 986321144 | NORDRE FOLLO |
| JOSTEIN EGELAND MASKIN AS | 979795424 | SANDNES |
| JOSTEIN MYGE AS | 979505043 | KARMØY |
| JOSTEIN RØNSEN ARKITEKTER AS | 975795942 | OSLO |
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| JOSTEIN VEDØY | 996478947 | STAVANGER |
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| JOTNE ANKERS AS | 980558630 | HALDEN |
| JOTUNHEIMEN BYGG AS | 922943893 | LOM |
| JOWA MASKIN AS | 989434632 | NORDREISA |
| JO W TOFTDAHL | 953855313 | GRAN |
| JP ENTREPRENØR AS | 925321494 | HORTEN |