The Planning Department works closely with several boards and committees providing technical assistance, guidance and general support. Members of these boards are residents of Westchester County. Most come to their position through appointment to a term of office by the County Executive or their municipal chief elected official.

 Westchester County Planning Board
 Westchester Municipal Planning Federation (WMPF)
 Soil and Water Conservation District
 Agriculture and Farmland Protection Board
 Housing Opportunities Commission
 Urban County Council