Chestnut Hill is an affluent New England village located six miles (10 km) west of downtown Boston, Massachusetts, United States. Like all Massachusetts villages, Chestnut Hill is not an incorporated municipal entity, but unlike most of them, it encompasses parts of three separate municipalities, each of which is in a different county: the town of Brookline in Norfolk County; the city of Boston in Suffolk County (parts of its neighborhoods of Brighton and West Roxbury), and the city of Newton in Middlesex County (all of its village of Chestnut Hill). Chestnut Hill’s borders are roughly defined by the Chestnut Hill, MA 02467 ZIP Code. Chestnut Hill is not strictly a topographical designation; the name refers to a series of small hills that overlook the 135-acre (546,000 m²) Chestnut Hill Reservoir rather than one particular hill. Chestnut Hill is perhaps best known as the home of Boston College, part of the Boston Marathon route, as well as the Collegiate Gothic canvas of landscape architect Frederick Law Olmsted.