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O'Neil & Associates, Inc. is headquartered in Miamisburg, Ohio (just South of Dayton), where it occupies a 78,000-square-foot, state-of-the-art facility on a 16-acre campus.

Our facilities are access-controlled via key cards. All employees wear badges with photographs. Visitors sign a visitor log and are required to wear visitor badges and be escorted while in our facility.


High-Bay Annex

We have a well-equipped high-bay annex that will accommodate all but the very largest of vehicles. This annex has been used to support work with many of our clients, especially on DoD projects that require extensive coverage of troubleshooting, diagnostics, and maintenance procedures. The 5,000-square-foot annex is climate controlled and accessible from inside our headquarters building.


Software Development Center

Because of our success with new programs, a dedicated software development center was opened across the street from ONEIL headquarters. Over 40 employees work in the center, primarily on the EMS NG program. Located at 4401 Lyons Road in Miamisburg, Ohio, this 10,000-square-foot facility has state-of-the-art communications, and computing. It holds offices, two conference rooms, a full kitchen, and a provides a collaborative work environment.The new software development center on Lyons Road gives ONEIL the capability of providing clients with specialized program support. Employees there are primarily working on EMS NG.


Corporate Headquarters

O'Neil & Associates, Inc.
495 Byers Road
Miamisburg, OH 45342-3662
Ph: 937.865.0800
Fax: 937.865.5858

Map to ONEIL Headquarters


Satellite Offices

Our largest satellite facility is in Oshkosh, Wisconsin, where we have over 40 personnel. Our Detroit office (Warren, Michigan) provides support to the U.S. Army TACOM and other corporations in the area. We also have offices and business development representatives in Florida, Oregon, South Carolina and Texas.


Contact information and maps (provided by MapQuest.com) of our facilities:

Oshkosh, Wisconsin:

O'Neil & Associates, Inc.
2211 Oregon Street, Unit D
Oshkosh, WI 54902-7001
Phone: 920.237.2381
Fax: 920.237.2388
Map to Oshkosh Office


Warren, Michigan:    

O'Neil & Associates, Inc.
29900 Lorraine Ave., Suite 100
Warren, MI 48093
Phone: 586.558.6813
Fax: 586.558.6899

Map to Warren Office                


Fort Worth, Texas:

O'Neil & Associates, Inc.
C/O Paul Haslam
109 Oriole Street
Weatherford, TX 76086
Phone: 937.865.0846 x3633
Mobile: 817.412.0940
Fax: 937.865.5858


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