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List of towns, formation dates, and other details
| Eastchester | |
| 1895 Town of Eastchester south of Mount Vernon city border ceded to New York County; becomes part of the 24th ward of New York City | |
| 1898 Forms part of the Borough of the Bronx – one of the five boroughs in a consolidated New York City; remains in New York County | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |
| Kingsbridge | |
| 1872 Formed from southern part of Town of Yonkers (now City of Yonkers) in Westchester County | |
| 1874 Ceded to New York County; becomes part of the 24th ward of New York City | |
| 1898 Forms part of the Borough of the Bronx – one of the five boroughs in a new consolidated New York City; remains in New York City | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |
| Morrisania | |
| 1855 Formed from Town of West Farms | |
| 1874 Ceded to New York County; becomed 23rd ward of New York City | |
| 1898 Formed part of the Borough of the Bronx – one of five boroughs in a new consolidated New York City; remains in New York County | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |
| Pelham (south) | |
| 1895 Southern part of Pelham ceded to New York County; becomes part of the 24th ward of New York City | |
| 1898 Forms part of the Borough of the Bronx – one of the five boroughs in a new consolidated New York City; remains in New York County | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |
| Westchester | |
| 1791 Annexed the Town of Morrisania | |
| 1846 Daughter town West Farms created (included land from former Town of | |
| Morrisania) | |
| 1898 Forms part of the Borough of the Bronx – one of five boroughs in a new consolidated New York City; remains in New York County | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |
| West Farms | |
| 1846 Formed from Town of Westchester | |
| 1855 Daughter town Morrisania formed | |
| 1874 Ceded to New York County; becomes part of 24th ward of New York City | |
| 1898 Forms part of the Borough of the Bronx – one of five boroughs in a new consolidated New York City; remains in New York County | |
| 1914 Borough of the Bronx ceded from New York County, becomes Bronx County | |