Deadline to switch to STAR by municipality: Westchester County
| Municipal name | School district name | Tax base growth factor |
| City of Mt Vernon | Mount Vernon | Four weeks prior to June 30 |
| City of New Rochelle | New Rochelle | Two weeks prior to August 1 |
| City of Peekskill | Hendrick Hudson | Four weeks prior to July 1 |
| City of Peekskill | Peekskill | Four weeks prior to July 1 |
| City of Rye | Rye | Four weeks prior to July 30 |
| City of Rye | Rye Neck | Four weeks prior to September 1 |
| City of White Plains | White Plains | Two weeks prior to March 1 |
| City of Yonkers | Yonkers | Two weeks prior to April 10 |
| Town of Bedford | Bedford | Four weeks prior to September 1 |
| Town of Bedford | Byram Hills | Four weeks prior to September 1 |
| Town of Bedford | Katonah-Lewisboro | Four weeks prior to September 1 |
| Town of Cortlandt | Croton-Harmon | Four weeks prior to September 1 |
| Town of Cortlandt | Hendrick Hudson | Four weeks prior to September 1 |
| Town of Cortlandt | Lakeland | Four weeks prior to September 1 |
| Town of Cortlandt | Putnam Valley | Four weeks prior to September 1 |
| Town of Cortlandt | Yorktown | Four weeks prior to September 1 |
| Town of Eastchester | Eastchester | Four weeks prior to September 1 |
| Town of Eastchester | Tuckahoe | Four weeks prior to September 1 |
| Town of Eastchester (Bronxville) | Bronxville | Two weeks prior to April 1 |
| Town of Greenburgh | Ardsley | Four weeks prior to September 1 |
| Town of Greenburgh | Dobbs Ferry | Four weeks prior to September 1 |
| Town of Greenburgh | Edgemont | Four weeks prior to September 1 |
| Town of Greenburgh | Elmsford | Four weeks prior to September 1 |
| Town of Greenburgh | Greenburgh | Four weeks prior to September 1 |
| Town of Greenburgh | Hastings On Hudson | Four weeks prior to September 1 |
| Town of Greenburgh | Irvington | Four weeks prior to September 1 |
| Town of Greenburgh | Pocantico Hills | Four weeks prior to September 1 |
| Town of Greenburgh | Tarrytowns | Four weeks prior to September 1 |
| Town of Greenburgh | Valhalla | Four weeks prior to September 1 |
| Town of Harrison | Harrison | Four weeks prior to September 1 |
| Town of Lewisboro | Katonah-Lewisboro | Four weeks prior to September 1 |
| Town of Mamaroneck | Mamaroneck | Four weeks prior to September 1 |
| Town of Mamaroneck | Scarsdale | Four weeks prior to September 1 |
| Town of Mount Kisco | Bedford | Four weeks prior to September 1 |
| Town of Mount Pleasant | Briarcliff Manor | Four weeks prior to September 1 |
| Town of Mount Pleasant | Byram Hills | Four weeks prior to September 1 |
| Town of Mount Pleasant | Chappaqua | Four weeks prior to September 1 |
| Town of Mount Pleasant | Mount Pleasant | Four weeks prior to September 1 |
| Town of Mount Pleasant | Pleasantville | Four weeks prior to September 1 |
| Town of Mount Pleasant | Pocantico Hills | Four weeks prior to September 1 |
| Town of Mount Pleasant | Tarrytowns | Four weeks prior to September 1 |
| Town of Mount Pleasant | Valhalla | Four weeks prior to September 1 |
| Town of New Castle | Bedford | Four weeks prior to September 1 |
| Town of New Castle | Byram Hills | Four weeks prior to September 1 |
| Town of New Castle | Chappaqua | Four weeks prior to September 1 |
| Town of New Castle | Ossining | Four weeks prior to September 1 |
| Town of New Castle | Pleasantville | Four weeks prior to September 1 |
| Town of New Castle | Yorktown | Four weeks prior to September 1 |
| Town of North Castle | Bedford | Four weeks prior to September 1 |
| Town of North Castle | Byram Hills | Four weeks prior to September 1 |
| Town of North Castle | Harrison | Four weeks prior to September 1 |
| Town of North Castle | Mount Pleasant | Four weeks prior to September 1 |
| Town of North Castle | Valhalla | Four weeks prior to September 1 |
| Town of North Salem | Katonah-Lewisboro | Four weeks prior to September 1 |
| Town of North Salem | North Salem | Four weeks prior to September 1 |
| Town of Ossining | Briarcliff Manor | Four weeks prior to September 1 |
| Town of Ossining | Ossining | Four weeks prior to September 1 |
| Town of Pelham | Pelham | Four weeks prior to September 1 |
| Town of Pound Ridge | Bedford | Four weeks prior to September 1 |
| Town of Pound Ridge | Katonah-Lewisboro | Four weeks prior to September 1 |
| Town of Rye | Blind Brook-Rye | Four weeks prior to September 1 |
| Town of Rye | Harrison | Four weeks prior to September 1 |
| Town of Rye | Port Chester-Rye | Four weeks prior to September 1 |
| Town of Rye | Rye Neck | Four weeks prior to September 1 |
| Town of Scarsdale | Scarsdale | Four weeks prior to September 1 |
| Town of Somers | Lakeland | Four weeks prior to September 1 |
| Town of Somers | North Salem | Four weeks prior to September 1 |
| Town of Somers | Somers | Four weeks prior to September 1 |
| Town of Yorktown | Croton-Harmon | Four weeks prior to September 1 |
| Town of Yorktown | Lakeland | Four weeks prior to September 1 |
| Town of Yorktown | Ossining | Four weeks prior to September 1 |
| Town of Yorktown | Yorktown | Four weeks prior to September 1 |
Updated: