Question: What county is Eugene F. Endicott's birthplace located in?

full_context: Document 1: Medford, Massachusetts: Medford is a city 3.2 miles northwest of downtown Boston on the Mystic River in Middlesex County, Massachusetts, United States. In the 2010 U.S. Census, Medford's population was 56,173. It is home to Tufts University.
Document 2: Endicott House: The MIT Endicott House is a conference center located in Dedham, Massachusetts, about south-west from downtown Boston. The center consists of the Endicott mansion, a Normandy French-style chateau, along with an art lecture facility known as the Brooks Center, and of gardens, lawn, woods and ponds. Since 1955, when it was given to Massachusetts Institute of Technology by the Endicott family, it has been owned and operated by MIT. It is one of the oldest such facilities in the United States. Endicott House serves as a meeting facility for many MIT departments and is the primary site of the Senior Executive Program of the MIT Sloan School of Management. The house also hosts conferences and meetings for other educational, medical, governmental, and nonprofit organizations.
Document 3: Chelsea, Massachusetts: Chelsea is a city in Suffolk County, Massachusetts, United States, directly across the Mystic River from the city of Boston. As of 2013, Chelsea had an estimated population of 36,828. It is also the second most densely populated city in Massachusetts behind Somerville. With a total area of just 2.21 square miles, Chelsea is the smallest city in Massachusetts in terms of total area.
Document 4: Boston: Boston has an area of 89.6 square miles (232.1 km2)—48.4 square miles (125.4 km2) (54.0%) of land and 41.2 square miles (106.7 km2) (46.0%) of water. The city's official elevation, as measured at Logan International Airport, is 19 ft (5.8 m) above sea level. The highest point in Boston is Bellevue Hill at 330 feet (100 m) above sea level, and the lowest point is at sea level. Situated onshore of the Atlantic Ocean, Boston is the only state capital in the contiguous United States with an oceanic coastline.
Document 5: James Curtiss: James Curtiss (also Curtis) (March 29, 1806 – November 2, 1859) was an American politician who twice served as Mayor of Chicago, Illinois (1847–1848 and 1850–1851) for the Democratic Party.
Document 6: Chelsea, Alabama: Chelsea is a city in Shelby County, Alabama, United States. It is part of the Birmingham metropolitan area. Chelsea was incorporated on March 1, 1996, with a population of 906. At the 2000 census the population was 2,949. According to the U.S. Census Bureau, the 2010 population for Chelsea was 10,183. Its seasonal campsite for visitors is Hargis Retreat which began in 1984. Chelsea is widely considered the fastest growing city in Shelby County, which is the fastest growing county in the state of Alabama.
Document 7: Leonard B. Chandler: Leonard Blanchard Chandler (August 29, 1851 – November 9, 1927) was a Massachusetts businessman and politician who served in the 1917 Massachusetts Constitutional Convention, in both branches of the Massachusetts legislature, both branches of the city council and as the twelfth Mayor of Somerville, Massachusetts.
Document 8: Eugene F. Endicott: Eugene F. Endicott (October 14, 1848 – December 10, 1914) was a Massachusetts politician who served as the fourteenth Mayor of Chelsea, Massachusetts.]
Document 9: Massachusetts: Commonwealth of Massachusetts Flag Seal Nickname (s): The Bay State Motto (s): Ense petit placidam sub libertate quietem (Latin) By the sword we seek peace, but peace only under liberty State song (s): ``All Hail to Massachusetts ''Official language English Spoken languages English 77.4% Spanish 8.6% Portuguese 2.8% Chinese 2.1% Demonym Bay Stater (official) Massachusite (traditional) Massachusettsian Capital (and largest city) Boston Largest metro Greater Boston Area Ranked 44th Total 10,565 sq mi (27,336 km) Width 183 miles (295 km) Length 113 miles (182 km)% water 25.7 Latitude 41 ° 14 ′ N to 42 ° 53 ′ N Longitude 69 ° 56 ′ W to 73 ° 30 ′ W Population Ranked 15th Total 6,811,779 (2016 est.) Density 840 / sq mi (324 / km) Ranked 3rd (9) Median household income $67,861 (7th) Elevation Highest point Mount Greylock 3,489 ft (1063.4 m) Mean 500 ft (150 m) Lowest point Atlantic Ocean sea level Before statehood Province of Massachusetts Bay Admission to Union February 6, 1788 (6th) Governor Charlie Baker (R) Lieutenant Governor Karyn Polito (R) Legislature General Court Upper house Senate Lower house House of Representatives U.S. Senators Elizabeth Warren (D) Ed Markey (D) U.S. House delegation 9 Democrats (list) Time zone Eastern: UTC - 5 / - 4 ISO 3166 US - MA Abbreviations MA, Mass. Website www.mass.gov
Document 10: Frank B. Fay: Franklin Brigham Fay (January 24, 1821 – March 20, 1904) was a Massachusetts businessman and politician who served as the third Mayor of Chelsea, Massachusetts and in both houses of the Massachusetts legislature.
Document 11: James B. Forsyth: James Brander Forsyth (October 25, 1809 – March 8, 1872) was a Massachusetts physician and politician who served as a city councilor, alderman and as the sixth Mayor of Chelsea, Massachusetts.
Document 12: Joseph A. Melley: Joseph Aloysius Melley (March 1, 1902 – October 28, 1983) was a Massachusetts attorney and politician who served as the thirty ninth Mayor of Chelsea, Massachusetts, USA, and in both houses of the Massachusetts legislature.
Document 13: Joseph E. Bates: Joseph E. Bates (May 5, 1837 – September 22, 1900) was an American politician who served on the city council and as mayor.
Document 14: Boston: Boston is surrounded by the "Greater Boston" region and is contiguously bordered by the cities and towns of Winthrop, Revere, Chelsea, Everett, Somerville, Cambridge, Newton, Brookline, Needham, Dedham, Canton, Milton, and Quincy. The Charles River separates Boston from Watertown and the majority of Cambridge, and the mass of Boston from its own Charlestown neighborhood. To the east lie Boston Harbor and the Boston Harbor Islands National Recreation Area (which includes part of the city's territory, specifically Calf Island, Gallops Island, Great Brewster Island, Green Island, Little Brewster Island, Little Calf Island, Long Island, Lovells Island, Middle Brewster Island, Nixes Mate, Outer Brewster Island, Rainsford Island, Shag Rocks, Spectacle Island, The Graves, and Thompson Island). The Neponset River forms the boundary between Boston's southern neighborhoods and the city of Quincy and the town of Milton. The Mystic River separates Charlestown from Chelsea and Everett, and Chelsea Creek and Boston Harbor separate East Boston from Boston proper.
Document 15: Boston: Boston is surrounded by the "Greater Boston" region and is contiguously bordered by the cities and towns of Winthrop, Revere, Chelsea, Everett, Somerville, Cambridge, Watertown, Newton, Brookline, Needham, Dedham, Canton, Milton, and Quincy. The Charles River separates Boston from Watertown and the majority of Cambridge, and the mass of Boston from its own Charlestown neighborhood. To the east lie Boston Harbor and the Boston Harbor Islands National Recreation Area (which includes part of the city's territory, specifically Calf Island, Gallops Island, Great Brewster Island, Green Island, Little Brewster Island, Little Calf Island, Long Island, Lovells Island, Middle Brewster Island, Nixes Mate, Outer Brewster Island, Rainsford Island, Shag Rocks, Spectacle Island, The Graves, and Thompson Island). The Neponset River forms the boundary between Boston's southern neighborhoods and the city of Quincy and the town of Milton. The Mystic River separates Charlestown from Chelsea and Everett, and Chelsea Creek and Boston Harbor separate East Boston from Downtown, the North End, and the Seaport.
ground_truth: Suffolk County
sub_queries: Eugene F. Endicott >> place of birth Answer: Chelsea
Chelsea >> located in the administrative territorial entity Answer: Suffolk County