The George L. Lilley Papers document Lilley's career as a politician in Waterbury, and representing Connecticut as a whole. The collection spans 1899 through 1909, and is largely composed of correspondence. In addition to documents relating to Lilley's Congressional and Gubernatorial sessions, there is a small amount of personal items including bills, dealings as a landlord, and scrapbooks relating to his death. A scrapbook of clippings about Lilley was kept until 1934, probably by his wife. The collection is arranged into 2 series Professional Files and Personal Files.

Boxes 11 and 12 are oversized newspaper boxes. Items 8, 9, and 10 are ledgers/scrapbooks and are housed separately.