Abstract: John F. Hylan was the 96th Mayor of New York City from 1918 to 1925. This collection contains the material generated by the daily workings of the Office of the Mayor during his two-term mayoral administration.

Abstract: John P. Mitchel was the 95th Mayor of New York, serving during the World War I era from 1914-1917. This collection consists of the records produced by the Office of the Mayor during his administration.

Abstract: Robert Anderson Van Wyck (1849-1918) was the first Mayor to take office after the consolidation of the City of New York in 1898. This collection consists of the subject files and correspondence of his administration.

Abstract: William Jay Gaynor served as the 94th Mayor of the City of New York from 1910 to 1913. This collection contains the material generated by the daily workings of the Office of the Mayor during his mayoral administration.