A number of towns which were at one time part of Westchester County now form the Bronx.The towns were annexed by New York City over a period of many years and finally combined to form the Bronx Borough in 1898. Records (such as wills and deeds) that were created before annexation were retained by Westchester County. Records created after annexation were theoretically kept by New York City until 1914 when the Bronx Borough became Bronx County.    

Listed below are the annexed Westchester towns (indicated in bold lettering) with their dates of annexation. Beneath each town is a list of the villages which were, at one time or another, located within the boundaries of that town.  

Because records of these towns have become widely scattered, a list of record-keeping organizations in the Bronx and New York City is also available.

Westchester Towns (including their corresponding Villages) and annexation dates that are now part of the Bronx:

Kingsbridge (1872)
Kingsbridge
Riverdale
South Yonkers
Spuyten Duyvil

Morrisania (1874)
Claremont (western portion)
Eltona
High Bridgeville
Melrose (east & south portions)
Morrisania (east old portions)
Morrisania Village
Morrisport (a.k.a. Port Morris)
Mott Haven (opposite Harlem)
Woodstock

West Farms (1874)
Claremont (portions)
Fairmount
Fordham Manor
Fordham Village
Morrisania (central portion, a.k.a. Adamsville, Mt. Hope)
Tremont
West Farms Village
Williamsbridge

Westchester (1895)
Bronxdale
Centerville
Classons Point (a.k.a. Cornhills Neck)
Connersville
Fort Schuyler
Integrity
Olinville
Schuylerville
Throggs Neck
Union Port
Wakefield
Westchester Village
West Farms Village (until 1846)
Zeregors Point