Question: The First United States Congress, consisting of the United States Senate and the United States House of Representatives, met from March 4, 1789, to March 4, 1791, during the first two years of George Washington's presidency, first at Federal Hall, in which city?

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1st United States Congress: The First United States Congress, consisting of the United States Senate and the United States House of Representatives, met from March 4, 1789, to March 4, 1791, during the first two years of George Washington's presidency, first at Federal Hall in New York City and later at Congress Hall in Philadelphia.  With the initial meeting of the First Congress, the United States federal government officially began operations under the new (and current) frame of government established by the 1787 Constitution.  The apportionment of seats in the House of Representatives was based on the provisions of of the Constitution.  Both chambers had a Pro-Administration majority.  Twelve articles of amendment to the Constitution were passed by this Congress and sent to the states for ratification; the ten ratified as additions to the Constitution on December 15, 1791, are collectively known as the Bill of Rights.

2nd United States Congress: The Second United States Congress, consisting of the United States Senate and the United States House of Representatives, met at Congress Hall in Philadelphia, Pennsylvania, from March 4, 1791, to March 4, 1793, during the third and fourth years of George Washington's presidency.  The apportionment of seats in the House of Representatives was based on the provisions of of the United States Constitution.  Additional House seats were assigned to the two new states of Vermont and Kentucky.  Both chambers had a Pro-Administration majority.

71st United States Congress: The Seventy-first United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met in Washington, D.C. from March 4, 1929, to March 4, 1931, during the first two years of Herbert Hoover's presidency.  The apportionment of seats in the House of Representatives was based on the Thirteenth Decennial Census of the United States in 1910.  Both chambers had a Republican majority.  This congress saw the most special elections of any congress with 27 in all.

45th United States Congress: The Forty-fifth United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met in Washington, D.C. from March 4, 1877, to March 4, 1879, during the first two years of Rutherford Hayes's presidency.  The apportionment of seats in the House of Representatives was based on the Ninth Census of the United States in 1870.  The Senate had a Republican majority, and the House had a Democratic majority.

49th United States Congress: The Forty-ninth United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met in Washington, D.C. from March 4, 1885, to March 4, 1887, during the first two years of Grover Cleveland's first presidency.  The apportionment of seats in the House of Representatives was based on the Tenth Census of the United States in 1880.  The Senate had a Republican majority, and the House had a Democratic majority.

6th United States Congress: The Sixth United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met at Congress Hall in Philadelphia, Pennsylvania and in Washington, D.C. from March 4, 1799, to March 4, 1801, during the last two years of John Adams's presidency.  It was the last Congress of the 18th century and the first to convene in the 19th.  The apportionment of seats in House of Representatives was based on the First Census of the United States in 1790.  Both chambers had a Federalist majority.  This was the last Congress in which the Federalist Party controlled the presidency or either chamber of Congress.

7th United States Congress: The Seventh United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met in Washington, D.C. from March 4, 1801, to March 4, 1803, during the first two years of Thomas Jefferson's presidency.  The apportionment of seats in the House of Representatives was based on the First Census of the United States in 1790.  Both chambers had a Democratic-Republican majority, except during the Special session of the Senate, when there was a Federalist majority in the Senate.

Federal Hall: Federal Hall, built in 1700 as New York's City Hall, later served as the first capitol building of the United States of America under the Constitution, as well as the site of George Washington's inauguration as the first President of the United States under the Constitution.  It was also where the United States Bill of Rights was introduced in the First Congress.  The building was demolished in 1812.

4th United States Congress: The Fourth United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met at Congress Hall in Philadelphia, Pennsylvania, from March 4, 1795, to March 4, 1797, during the last two years of George Washington's presidency.  The apportionment of seats in the House of Representatives was based on the First Census of the United States in 1790.  The Senate had a Federalist majority, and the House had a Democratic-Republican majority.

47th United States Congress: The Forty-seventh United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives.  It met in Washington, D.C. from March 4, 1881, to March 4, 1883, during the final year of James Garfield's presidency, and the first two years of his successor, Chester Arthur.  The apportionment of seats in this House of Representatives was based on the Ninth Census of the United States in 1870.  The House had a Republican majority; the Senate was evenly divided.

Supporting paragraphs: 1st United States Congress Federal Hall
Answer: New York City