The Linthicum-Shipley Improvement Association is a voluntary-membership, non-profit organization dedicated to preserving the quality of life in Linthicum, Md. The LSIA has been watching over Linthicum since 1975. The organization was formed with the merging of the Linthicum Civic Association, which dated back into the 1950s, and the Shipley Improvement Association, which was formed in the early 1970s.