The CDP occupies the more intensively developed eastern and southern parts of the town of Londonderry, including the east half of the historic town center near the top of Moose Hill.

The CDP includes the Londonderry town offices (east side of Mammoth Road) but not the Londonderry High School and Middle School complexes (west side of Mammoth Road).

[4] Most of the CDP drains southeast to Beaver Brook, which forms the border with the town of Windham and flows south to the Merrimack River in Lowell, Massachusetts.

The southwestern corner of the CDP drains west via Chase Brook to the Merrimack in Litchfield.

16.4% of all households were made up of individuals, and 5.5% were someone living alone who was 65 years of age or older.