NIA members must reside within the following boundaries for membership eligibility.

Nabnasset Improvement Association Boundaries
South side of Route 40 (Chelmsford Line) from Chelmsford town line to Boston and Maine Railroad tracks to intersection with Depot Road. Plain Road to intersection with Nutting Road. From Nutting Road to intersection with Bobolink (Nutting Road #16). From end of Boblink following a straight line to intersection with Nabnasset Lake, following the western shoreline of Nabnasset Lake to Muriel Drive, following Lawson Road to intersection of Forrest Road; Forrest Road to intersection of Route 40 (House #434). House #434 Route 40 easterly on Route 40 to intersection of Chelmsford town line. This excluding all properties to the North of Route 40.