415 Hamilton Blvd. Peoria, IL • (309) 637-5282
Attorneys Call Now Practice Case Review


Fill out this form for a free case review

click here


About Us

Cusack, Gilfillan & O'Day, LLC (CGO) was founded by Peoria attorney Dan Cusack on April 1, 1984.  Joe Gilfillan and Dan O'Day joined the firm several years later and became partners in 1991.

As of 2012, the attorneys of Cusack, Gilfillan & O'Day, LLC have a total of over 175 years of experience practicing law in Central Illinois and have represented thousands of clients. The firm, consisting of nine attorneys, operates a general practice of law with each partner and associate concentrating in specific areas of practice. Cusack, Gilfillan & O'Day, LLC advises and represents both individuals and businesses with an emphasis on personal injury, workers' compensation, family law, real estate, civil litigation, criminal law, appeals, estate planning, probate, businesses, and employment litigation.

The attorneys of Cusack, Gilfillan & O'Day, LLC have appeared in circuit courts throughout most of the State. However, since we are based in Peoria, the majority of our work is in Central Illinois. 

Our attorneys regularly appear in court in Peoria, Tazewell, Woodford, Marshall, Putnam, Stark, Knox, Fulton and McLean Counties. They also appear in counties such as Warren, Henry, Mason, Livingston and McDonough.

Cusack, Gilfillan & O'Day, LLC attorneys are admitted in Federal Courts in Illinois, and often appear in State and Federal courts of review including the Illinois Appellate and Supreme Courts.