Question: In which county is William L. Baird's birthplace?

full_context: Document 1: Michael A. Costello: Michael A. Costello (born May 5, 1965 in Lynn, Massachusetts) is a former State Representative for the Massachusetts House of Representatives, who represented the first district of Essex County, Massachusetts. Costello graduated from Salem State University in 1989 with a Bachelor of Science, and from Suffolk University Law School with his Juris Doctor in 1996. Costello served in the House from 2003 to 2014.
Document 2: Leverett Saltonstall I: Leverett Saltonstall (June 13, 1783 – May 8, 1845), was a member of the United States House of Representatives from Massachusetts who also served as Speaker of the Massachusetts House of Representatives, President of the Massachusetts Senate, the first Mayor of Salem, Massachusetts and a Member of the Board of Overseers of Harvard College.
Document 3: George Hood (Massachusetts politician): George Hood (August 28, 1794 – June 29, 1859) was a Massachusetts politician who served in both houses of the Massachusetts legislature and as the first Mayor of Lynn, Massachusetts.
Document 4: Hiram N. Breed: Hiram Nichols Breed (2 September 1809 – 31 March 1893) was a Massachusetts cordwainer and politician who served as the ninth Mayor of Lynn, Massachusetts.
Document 5: Jay Costa: Jay Costa (born November 17, 1957) is a Democratic member of the Pennsylvania State Senate who has represented the 43rd District since 1996. He is a member of the Costa political family in Pittsburgh. On November 17, 2010, Senate Democrats elected Costa as their new floor leader, succeeding the retiring Bob Mellow.
Document 6: William L. Baird: William Lewis Baird (July 29, 1843 – July 7, 1916) was a Massachusetts politician who served as the 19th Mayor of Lynn, Massachusetts.
Document 7: Samuel M. Bubier: Samuel Mansfield Bubier (June 28, 1816 – October 5, 1894) was a Massachusetts shoe manufacturer and politician who served as a member of the Board of Aldermen and as the 16th Mayor of Lynn, Massachusetts.
Document 8: Jay Livingstone: Jay Livingstone is an American politician who has served in the Massachusetts House of Representatives since July 2013. He is a resident of Back Bay, Boston, a member of the Democratic Party. He won a special election to succeed Martha M. Walz, unopposed in the June 25 general election after winning the May 28 primary. He was sworn in July 17, 2013. He has since won re-election in 2014, 2016, and 2018.
Document 9: John R. Baldwin: John Richard Baldwin (May 10, 1854 – May 1, 1897) was a Massachusetts politician who served in the Massachusetts State Senate and as the 20th Mayor of Lynn, Massachusetts.
Document 10: Boston: Federally, Boston is split between two congressional districts. The northern three-fourths of the city is in the 7th district, represented by Mike Capuano since 1998. The southern fourth is in the 8th district, represented by Stephen Lynch. Both are Democrats; a Republican has not represented a significant portion of Boston in over a century. The state's senior member of the United States Senate is Democrat Elizabeth Warren, first elected in 2012. The state's junior member of the United States Senate is Democrat Ed Markey, who was elected in 2013 to succeed John Kerry after Kerry's appointment and confirmation as the United States Secretary of State.
Document 11: 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 12: Cleon Turner: Cleon H. Turner (born December 29, 1945 in Brockton, Massachusetts) is a former state representative in Massachusetts. He represented the First Barnstable District of Brewster from 2005 to 2015. Turner graduated from Silver Lake Regional High School, earned his B.A. from the University of Southern Maine, an A.S. from the University of Maine and his J.D. from Suffolk University Law School. He was elected in 2004 and began his term in 2005. In December 2013, he announced his retirement effective January 6, 2015.
Document 13: Jacob M. Lewis: Jacob Meek Lewis (October 13, 1823 – January 5, 1905) was a Massachusetts politician who served as the 15th Mayor of Lynn, Massachusetts, USA.
Document 14: Michael Berland: Michael Berland attended The Latin School of Chicago and graduated magna cum laude from the University of Massachusetts Amherst, where he was a Commonwealth Scholar. He received his initial training at the Social and Demographic Research Institute.
Document 15: Peter M. Neal: Peter Morrell Neal (September 21, 1811-April 13, 1908) was a Massachusetts politician who served in both branches of the Massachusetts legislature and was the tenth Mayor of Lynn, Massachusetts.
ground_truth: Essex County
sub_queries: William L. Baird >> place of birth Answer: Lynn
Lynn >> located in the administrative territorial entity Answer: Essex County