Langan Engineering, Environmental, Surveying, Landscape Architecture and Geology D.P.C.
Langan Engineering and Environmental Services, LLC
Langan MA, Inc.
Langan CA, Inc.
Langan International, LLC
Langan International UK, Ltd.
Langan Panama LLC
Langan Panama, S. DE R.L.
Langan CT, Inc.
Langan MI, Inc.
Langan NC, Inc.