Question: According to the 2010 census, what is the population of the city which boasts the West Montgomery Avenue Historic District?

Context paragraphs:
Wagner Free Institute of Science: The Wagner Free Institute of Science is a natural history museum at 1700 West Montgomery Avenue in northern Philadelphia, Pennsylvania, USA.  Founded in 1855, it is a rare surviving example of a Victorian era scientific society, with a museum, research center, library, and educational facilities.  Its buildings, developed between 1859 and 1901, present the collections of founder William Wagner in the style of the period, and have been designated a National Historic Landmark for their architecture and state of preservation.

Little Montgomery Street Historic District: Little Montgomery Street Historic District is a national historic district in Baltimore, Maryland, United States.  It is composed of approximately 15 19th century brick houses, some of which are double, that line the 100-block of West Montgomery Street and the northwestern portion of the 800 block of Leadenhall Street.  All the buildings are small in scale and of brick construction, abut the sidewalks, are closely spaced, and are generally two to three stories high with two-bay façades.  Nine of the structures are "half houses" that are only one room deep with a single pitch roof.  The district is associated with a working class urban community where, throughout the 19th and early 20th centuries Baltimore’s native poor, struggling German and Irish immigrants, and freed southern blacks lived side by side competing for the same space and the same railroad and port-related jobs.

Harvard Avenue Historic District: The Harvard Avenue Historic District is a historic district roughly bounded by Linden Street, Commonwealth Avenue, Harvard Avenue, and Park Vale Avenue in the Allston neighborhood of Boston, Massachusetts.  Its spine is Harvard Avenue, a major north-south thoroughfare connecting Allston to points north (generally via Cambridge Street toward Cambridge), and south toward Brookline.  The area underwent a population explosion in the early 20th century, and Harvard Avenue was developed roughly between 1905 and 1925 as a commercial and residential spine.  Notable buildings in the district include the Allston Station building, designed by Shepley, Rutan and Coolidge, and the Harvard Avenue Fire Station.

West Garrison Avenue Historic District: The West Garrison Avenue Historic District is a historic district encompassing the oldest commercial section of Fort Smith, Arkansas.  When listed on the National Register of Historic Places in 1979, the district included just a five-block stretch of Garrison Avenue, the major east-west thoroughfare in the city and one its oldest, dating to the city's founding in 1838.  The district included more than fifty historically significant buildings built before 1912.  The area was significantly affected by a major tornado in September 1996, in which thirteen historic buildings were destroyed and others damaged.  The district was subsequently enlarged in 2001 to encompass 175 buildings with historic significance to 1951.  These buildings are located along the length of Garrison Avenue (twelve blocks), as well as Rogers Avenue and North "A" Street, which run parallel to Garrison (north and south of it, respectively), and the connecting north-south blocks.

Rockville, Maryland: Rockville is a U.S. city located in the central region of Montgomery County, Maryland.  It is the county seat and is a major incorporated city of Montgomery County and forms part of the Baltimore–Washington metropolitan area.  The 2010 census tabulated Rockville's population at 61,209, making it the third largest incorporated city in Maryland, behind Baltimore and Frederick.  Rockville is the largest incorporated city in Montgomery County, Maryland, although the nearby census-designated place of Germantown is more populous.

Swiss Avenue Historic District: The Swiss Avenue Historic District is a residential neighborhood in East Dallas, Dallas, Texas (USA).  It consists of installations of the Munger Place addition, one of East Dallas' early subdivisions.  The Swiss Avenue Historic District is a historic district of the city of Dallas, Texas.  The boundaries of the district comprise both sides of Swiss Avenue from Fitzhugh Steet, to just north of La Vista, and includes portions of Bryan Parkway.  The District includes the 6100-6200 blocks of La Vista Drive, the west side of the 5500 block of Bryan Parkway the 6100-6300 blocks of Bryan Parkway, the east side of the 5200-5300 block of Live Oak Street, and the 4900-6100 blocks of Swiss Avenue.  The entire street of Swiss Avenue is not included within the bounds of the Swiss Avenue Historic District.  Portions of the street run through Dallas' Peaks Suburban Addition neighborhood and Peak's Suburban Addition Historic District.

Chestnut Lodge: Chestnut Lodge (formerly known as Woodlawn Hotel) was a historic building in Rockville, Maryland, United States, well known as a psychiatric institution.  It was a contributing property to the West Montgomery Avenue Historic District.

Boston–Edison Historic District: The Boston–Edison Historic District is a historic neighborhood located in the geographic center of Detroit, Michigan.  It consists of over 900 homes built on four east/west streets: West Boston Boulevard, Chicago Boulevard, Longfellow Avenue, and Edison Avenue, stretching from Woodward Avenue on the east to Linwood Avenue on the west.  It is one of the largest residential historic districts in the nation.  It is surrounded by Sacred Heart Major Seminary to the west, the Arden Park-East Boston Historic District and the Cathedral of the Most Blessed Sacrament to the east, and the Atkinson Avenue Historic District to the south.  The district was designated a Michigan State Historic Site in 1973 and listed on the National Register of Historic Places in 1975.

West Montgomery Avenue Historic District: The West Montgomery Avenue Historic District is a national historic district located at Rockville, Montgomery County, Maryland.  It is a residential area with single-family homes predominating.  The majority of the properties within the district date from the 1880s, with a few older homes and somewhat more from later periods.  The predominant character of the district is set by the rows of Victorian houses built between 1880 and 1900 in a vernacular residential mode with Eastlake and Stick Style influences.  Also included in the district are attorneys' offices; churches and parsonages; a funeral home; the former Woodlawn Hotel, later called the Chestnut Lodge Sanitarium (destroyed by fire, June 7, 2009); and the headquarters of the Montgomery County Historical Society.

Avery Street Historic District: Avery Street Historic District, is a national historic district located at Parkersburg, Wood County, West Virginia.  It is to the east of the Julia-Ann Square Historic District and south of the Parkersburg High School-Washington Avenue Historic District.  Primarily residential, it encompasses 109 acres and includes churches, a school, and a small commercial area.  Built as Parkersburg's first "suburb" in the late-19th and early-20th century in popular architectural style such as Colonial Revival and Queen Anne, the district exhibits 12 distinctive types of Historic architecture.  There are 358 contributing buildings, 59 of which are considered to be pivotal.  U.S. Senator Johnson N. Camden (1826-1908) owned most of the land now included in the district.  Located in the district are the separately listed Parkersburg Women's Club and the First Presbyterian Church/Calvary Temple Evangelical Church.

Supporting paragraphs: West Montgomery Avenue Historic District Rockville, Maryland
Answer: 61,209