Beacon Hill is a historic neighborhood in Boston, Massachusetts, and the hill upon which the Massachusetts State House resides. The term "Beacon Hill" is used locally as a metonym to refer to the state government or the legislature itself, much like Washington, D.C.'s Capitol Hill does at the federal level. Federal-style rowhouses, narrow gaslit streets and brick sidewalks adorn the neighborhood, which is generally regarded as one of the more desirable and expensive in Boston. According to the 2010 U.S. Census, the population of Boston's Beacon Hill neighborhood is 9,023. Etymology Like many similarly named areas, the neighborhood is named for the location of a former beacon atop the highest point in central Boston. The beacon was used to warn the residents of an invasion. Geography Beacon Hill is bounded by Storrow Drive, and Cambridge, Bowdoin, Park and Beacon Streets. It is about 1/6 of a square mile, and situated along the riverfront of the Charles River Esplanade to the west, just north of Boston Common and the Boston Public Garden. The block bound by Beacon, Tremont and Park Streets is included as well. Beacon Hill has three sections: the south slope, the north slope and the "Flat of the Hill", which is a level neighborhood built on landfill. It is west of Charles Street and between Beacon Street and Cambridge Street. Located in the center of the Shawmut Peninsula, the area originally had three hills, Beacon Hill and two others nearby; Pemberton Hill and Mount Vernon, which were leveled for Beacon Hill development. The name trimount later morphed into "Tremont", as in Tremont Street. Between 1807 and 1832 Beacon Hill was reduced from 138 feet in elevation to 80 feet. The shoreline and bodies of water such as the Mill Pond had a "massive filling", increasing Boston's land mass by 150%. Charles Street was one of the new roads created from the project. Before the hill was reduced substantially, Beacon Hill was located just behind the current site of the Massachusetts State House. Demographics According to the 2010 U.S. Census, the population of Boston's Beacon Hill neighborhood is 9,023. This reflects a slight (0.3% or 29 individuals) decrease from the 2000 Census. The racial/ethnic make-up of the neighborhood's population is as follows: 86.8% of the population is white, 2% black or African American, 4.1% Hispanic or Latino, 0.1% American Indian or Alaska Native, 5.3% Asian, 0.4% some other race/ethnicity,