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O'Neil & Associates, Inc. is headquartered in Miamisburg, Ohio (just South of Dayton), where it occupies a 80,000-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.

Address: 495 Byers Road, Miamisburg, OH 45342-3662 Phone: 937-865-0800 Fax: 937-865-5858

Business Hours

Monday - Friday: 8am to 4:30pm Saturday: Closed Sunday: Closed


Our largest satellite facility is in Oshkosh, Wisconsin, where we have over 40 personnel.

Address: 2211 Oregon Street, Unit D Oshkosh, WI 54902-7001 Phone: 920-237-2381 Fax: 920-237-23889


Our Detroit office (Warren, Michigan) provides support to the U.S. Army TACOM and other corporations in the area.

Address: 29900 Lorraine Ave., Suite 100 Warren, MI 48093 Phone: 586-558-6813 Fax: 586-558-6899