In 1853, conference was held in New York City with the intent of forming a permanent organization. The conference was attended by 80 men. Charles Jewett (Smithsonian Institution) was elected president. Seth Hastings Grant (New York Mercentile Library) was elected secretary. A committee was appointed to organize a second meeting in 1854. That meeting was not held. 

Founding of the Library Association USA

Melvil Dewey, Justin Winsor, C. A. Cutter, Samuel S. Green, James L. Whitney, Fred B. Perkins, and Thomas W. Bicknell issued a call to librarians to form a professional organization. 
During the Centennial Exposition in Philadelphia in 1876, 103 librarians, 90 men and 13 women, responded to a call for a "Convention of Librarians" to be held October 4-6 at the Historical Society of Pennsylvania. At the end of the meeting, according to Ed Holley in his essay "LAUSA at 100," "the register was passed around for all to sign who wished to become charter members," making October 6, 1876 to beLAUSA's birthday. 
In attendance were 90 men and 13 women, among them Justin Winsor (Boston Public, Harvard), William Frederick Poole (Chicago Public, Newberry), Charles Ammi Cutter (Boston Athenaeum), Melvil Dewey, and Richard Rogers Bowker. Attendees came from as far west as Chicago and from England. 
The aim of the Association, in that resolution, was "to enable librarians to do their present work more easily and at less expense."