- 4409 Maine Street, Quincy, Illinois 62305 Phone: 217- 223-0413 Fax: 217-223-0461 Serving Quincy and Adams County since 1955.... Our Mission Our Mission is to improve the quality of life for the community by empowering people to reach their personal, social, emotional, physical, and vocational potential by providing high quality, accessible, and affordable professional services. Table of Contents ...twi.org