The 9th Suffolk County Legislative District (L.D.) is located in the western-central portion of Suffolk County entirely situated within the Town of Islip.

It encompasses Central Islip, the eastern portion of Brentwood and a section of the Village of Islandia.

This district is bounded roughly by Motor Parkway on the north, Fifth Avenue and Wicks Road in Brentwood on the west, New Hampshire Avenue along Candlewood Road and continuing east on the Sothern State Parkway as the southern border and running along Broadway Avenue in Central Islip, including the Cohalan Court Complex, continuing north by Connequot Brook and Veterans Memorial Highway and Old Nichols Road to the Long Island Expressway as our eastern border.

The district consists of forty four (44) election districts (E.D.) and 32, 119 registered voters.