The area is steeped in Quaker tradition. The Matinecock Friends Meeting House at Piping Rock and Duck Pond Roads, now in Glen Cove but historically part of Locust Valley, was built in 1725. It was destroyed by fire in 1985 and rebuilt the next year. It is on the National Register of Historic Places. Two private schools in Locust Valley, Friends Academy and the Portledge School, each on more than 60 acres, have national reputations.
Several communities are under the postal and school umbrella of Locust Valley.
Local history collection of the Locust Valley Library.