42 Greatstone Dr, Merrimack, NH is a single family home that contains 2,267 sq ft and was built in 1976. It contains 3 bedrooms and 2 bathrooms. This home last sold for $254,933 in January 2017. The Zestimate for this house is $324,431, which has increased by $1,861 in the last 30 days. The Rent Zestimate for this home is $2,195/mo, which has increased by $12/mo in the last 30 days. The property tax in 2017 was $6,677. The tax assessment in 2017 was $285,700, a decrease of 3.1% over the previous year.