McMahon Group

McMahon Group

The McMAHON group of companies is made up of two affiliated companies with a professional staff of over 160 employees that includes Architects; Civil, Process, Electrical, Environmental and Structural Engineers; Land Surveyors; Administrative and Support Personnel. Each company complements the other, so that a broad spectrum of professional services can be offered to our clients to meet their specific needs.

The affiliated companies are:

McMAHON ASSOCIATES, INC. (McMAHON)
Full-Service Engineering/Architectural Firm
Est. 1909

McMAHON, INC.
Full-Service Design/Build Firm
Est. 1991

(815) 636-9590
(815) 636-9591
1700 Hutchins Road
Machesney Park
IL
61115