Question: What was the population of the city that became a prosperous industrial town in the 19th century and that an American politician served as on the school Committee and the mayor?

Context articles: Ballyclare
Marlborough, Massachusetts
Henrietta Davis (politician)
Kevin White (mayor)
John J. McDonough (Boston)
Albion A. Perry
Kevin Aguiar
Paul Donato
Barbara Ackermann
Louis Farley

It sits on the river Six Mile Water.
 The town probably owes its origins to its being a crossing point of the river, the strategic importance of which is shown by existence of a small Norman motte on the south side of the river and presently located in the War Memorial Park.
 The broad main street dates from the 17th century.
 In the centre of the town is the Market Square with the Town Hall.
 The town grew in the 19th century with the coming of the railway and it became an important industrial town with a large paper mill in the South West of the town and a large Linen Bleach Green .
 These factories gave their names to the roads leading to them, the Mill Road and the Green Road, but have been closed for some time.
 It is now a local service centre with a significant dormitory role in relation to Belfast.
 It is the main focus within the rural area for shopping, education and recreation.
 To the north is the remnant of Craig Hill, which once provided a wooded backdrop but is now covered with modern housing.
 Much of the Craig Hill has been quarried for its basalt.
Marlborough (often spelled Marlboro) is a city in Middlesex County, Massachusetts, United States.
 The population was 38,499 at the 2010 census.
 Marlborough became a prosperous industrial town in the 19th century and made the transition to high technology industry in the late 20th century after the construction of the Massachusetts Turnpike.
Henrietta Davis is an American politician who served as the mayor of Cambridge, Massachusetts in 2012 and 2013.
 She was a member of the Cambridge City Council from 1996 to 2013, and a member of the Cambridge School Committee from 1988 to 1995.
Kevin Hagan White (September 25, 1929 – January 27, 2012) was an American politician best known as the Mayor of Boston, an office he was first elected at the age of 38, and that he held for four terms, amounting to 16 years, from 1968 to 1984.
 He presided as mayor during racially turbulent years in the late 1960s and the 1970s, and the start of desegregation of schools via court-ordered busing of school children in Boston.
 White won the mayoral office in the 1967 general election in a hard-fought campaign opposing the anti-busing and anti-desegregation Boston School Committee member Louise Day Hicks.
 White was earlier elected Massachusetts Secretary of the Commonwealth in 1960 at the age of 31; he resigned from that office after his election as Mayor.
John J. McDonough is an American politician who served as a member of the Boston School Committee from 1966 to 1968 and again from 1972 to 1982.
 He was the Chairman/President of the School Committee in 1967, 1975, 1976, and 1980.
 He was an unsuccessful candidate for Mayor of Boston in 1967.
Albion Atwood Perry (January 26, 1851 – February 1933) was an American politician who served on the water board, school committee, on both branches of the Somerville city council and as the ninth Mayor, of Somerville, Massachusetts.
Kevin Aguiar is an American politician who represented the 7th Bristol district in the Massachusetts House of Representatives.
 He was first elected in a 2008 special election following Robert Correia's resignation to become Mayor of Fall River, Massachusetts.
 From 2002-2009, Aguiar served as a member of the Fall School Committee.
 He was defeated for re-election in the 2012 Democratic primary by challenger Alan Silvia, who succeeded him.
Paul J. Donato (born October 27, 1941 in Boston) is an American politician who currently represents the 35th Middlesex District in the Massachusetts House of Representatives.
 He previously served as a member of the Medford, Massachusetts school committee from 1972 to 1975 and the city council from 1976 to 1985 and again from 1996 to 2000.
 While serving on the council, Donato also served as deputy mayor (1980 to 1985), Mayor (1980 to 1985), and council president (1999 to 2000).
Barbara Ackermann is an American politician and activist who served on the Cambridge, Massachusetts School Committee from 1962 to 1967, the City Council from 1968 to 1977, and was Mayor from 1972 to 1973.
Louis F. Farley was an American politician who served as on the Marlborough, Massachusetts School Committee, and as the Mayor of Marlborough, Massachusetts.