Montclair 's township in New Jersey has an area of over 6.2 square miles .
Montclair is located at ( 40.822249 , -74.211989 ) .According to the United States Census Bureau , the township has a total area of 6.3 square miles ( 16.3 km2 ) .Montclair is located on the First Mountain of the Watchung Mountains .
Montclair, New Jersey