Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Hetzenauer Christian Jakob
- Ing. Heumader Gerold Manfred
- Ing. Hickersberger Frowalt
- Ing. Hiden Andreas
- Ing. Hiden Franz
- Ing. Hiebl Melanie
- Ing. Hiebler Gerald
- Ing. Hierl Lukas
- Ing. Hiermann Alfred
- Ing. Hilbrand Fabian Alois
- Ing. Hillinger Wilhelm
- Ing. Hingerl Werner
- Ing. Hinterbuchinger Hannes
- Ing. Hinterramskogler Johann
- Ing. Hinterreither Michael
- Ing. Hinterseer Andreas
- Ing. Hintersteiner Dietmar
- Ing. Hipfel Stefan
- Ing. Hirsch Alexander
- Ing. Hirsch Andreas
- Ing. Hirschböck Franz
- Ing. Hirschhofer Ulrich Andreas
- Ing. Hirt Carmen Barbara
- Ing. Hirzinger Martin
- Ing. Hiter Vinzenz
- Ing. Hitthaler Konrad
- Ing. Hlous Thomas
- Ing. Hobel-Bromnik Christian
- Ing. Hobl Reinhard Josef
- Ing. Hochbichler Karl
- Ing. Hochegger Rene
- Ing. Hochhauser Bau- u. Sanierungs- technik GmbH
- Ing. Hochreiner Peter
- Ing. Hochstöger Johann
- Ing. Hochstöger Rudolf
- Ing. Hochwarter Wolfgang
- Ing. Hofbauer Andreas
- Ing. Hofegger GmbH
- Ing. Hofeneder Heinrich
- Ing. Hofer Andreas
- Ing. Hofer Bernhard
- Ing. Hofer Erich Franz
- Ing. Hofer Gerald Roman
- Ing. Hofer Robert
- Ing. Hofmaninger Gerald
- Ing. Hofmann Georg
- Ing. Hofmanninger Stefan
- Ing. Hofmeister Christoph Robert Viktor
- Ing. Hofstädter Marianne Karin
- Ing. Hofstätter Helmut
- Ing. Hohenegg Stefan Karl
- Ing. Hohensinner Heribert
- Ing. Hohl Viktor
- Ing. Holcapek Wilhelm
- Ing. Holler Heinz
- Ing. Holler Wolfgang
- Ing. Hollergschwandtner Johann Georg
- Ing. Holzer Franz
- Ing. Holzer Mario
- Ing. Holzer Sarah-Sophie
- Ing. Holzer Walter
- Ing. Holzerbauer BAU-Gesellschaft m.b.H.
- Ing. Holzhacker Michael Kurt
- Ing. Holzleitner Christoph Franz
- Ing. Holzleitner Stefan
- Ing. Holzmann Lukas
- Ing. Honisch OEG
- Ing. Hopfer Andreas Karl
- Ing. Hopfner Patrick
- Ing. Hornaus Thomas
- Ing. Horner Bernhard Peter
- Ing. Horner Christian Helmut
- Ing. Horsetzky-Hornthal Paul Ernst
- Ing. Horvat Ernst
- Ing. Horvath Gregor
- Ing. Horvath Jochen Alexander
- Ing. Hoschek Peter
- Ing. Hoschka Leo
- Ing. Hotter Christian
- Ing. Hrabalek Ernst