Howell & Thornhill PA Howell & Thornhill, P.A., Law Firm, Winter Haven, Lakeland, Sebring, Personal Injury Lawyers, Auto AccidentsHowell and Thornhill | Polk County’s Oldest Personal Injury Law Firm Polk county's oldest personal injury law firm, Howell and Thornhill serves Central Florida along the I-4 Corridor we have 7 convenient offices in Lakeland, Lake Wales, Haines City, Sebring, Zephyrhills, and our principal office in Winter Haven. Call for a free discussion of your rights, 800-992-0492