Middletown was a town in Richmond County, New York. It was incorporated in 1860 from parts of Southfield and Castleton. At the time, it included the most populous part of the village of Edgewater and the hilly ridges of the interior, Grymes Hill and Todt Hill among others.
It was dissolved in 1898 upon consolidation into the City of New York.
The City of Greater New York was the consolidation of the City of New Yorkwith Brooklyn, western Queens County, and Staten Island, which took effect on January 1, 1898. New York had already annexed the Bronx (west of the Bronx River in 1874, east of the Bronx River in 1895), so the consolidated city sprawled across five counties, which became the five Boroughs of modern New York. Eastern Queens County was excluded and later became Nassau County.