These historic Senate Chamber maps are reproduced from the Congressional Directory. The desk numbers on the floor plans were used to quickly identify a senator's seating location in the U.S. Senate Chamber. They do not correspond to the numbers used today to identify individual desks.
| Old Senate Chamber (1810-1859) | ||
|---|---|---|
| 26th Congress | 1st Session | 1840 |
| 27th Congress | 1st Session | 1841 |
| 27th Congress | 2nd Session | 1841-1842 |
| 28th Congress | 2nd Session | 1845 |
| 29th Congress | 1st Session | 1845 |
| 30th Congress | 1st Session | 1848 |
| 30th Congress | 1st Session | June 22, 1848 |
| 30th Congress | 2nd Session | 1849 |
| 31st Congress | 1st Session | 1850 |
| 31st Congress | 2nd Session | 1850 |
| 32nd Congress | 1st Session | 1852 |
| 32nd Congress | 1st Session | May 28, 1853 |
| 32nd Congress | 2nd Session | 1853 |
| 33rd Congress | 1st Session | 1854 |
| 33rd Congress | 1st Session | June 20, 1854 |
| 33rd Congress | 2nd Session | 1855 |
| 34th Congress | 1st Session | 1856 |
| 34th Congress | 1st Session | 1856 |
| 34th Congress | 3rd Session | December, 1856 |
| 35th Congress | 1st Session | 1858 |
| 35th Congress | 1st Session | 1858 |
| Current Senate Chamber (1859-Present) | ||
| 36th Congress | 1st Session | 1860 |
| 36th Congress | 1st Session | 1860 |
| 36th Congress | 2nd Session | 1861 |
| 37th Congress | 3rd Session | 1863 |
| 39th Congress | 2nd Session | 1866 |
| 39th Congress | 2nd Session | 1867 |
| 40th Congress | 1st Session | 1867 |
| 40th Congress | 2nd Session | 1867 |
| 40th Congress | 2nd Session | 1868 |
| 40th Congress | 3rd Session | 1869 |
| 40th Congress | 3rd Session | 1869 |
| 41st Congress | 1st Session | 1869 |
| 41st Congress | 1st Session | 1869 |
| 41st Congress | 1st Session | 1869 |
| 41st Congress | 2nd Session | 1869 |
| 41st Congress | 2nd Session | 1870 |
| 41st Congress | 3rd Session | 1870 |
| 41st Congress | 3rd Session | 1871 |
| 42nd Congress | 1st Session | March 25, 1871 |
| 42nd Congress | 2nd Session | January 15, 1872 |
| 42nd Congress | 2nd Session | May 20, 1872 |
| 42nd Congress | 3rd Session | December 14, 1872 |
| 42nd Congress | 3rd Session | February 12, 1873 |
| 43rd Congress | 1st Session | February 24, 1874 |
| 43rd Congress | 1st Session | June 13, 1874 |
| 43rd Congress | 2nd Session | December 15, 1874 |
| 43rd Congress | 2nd Session | February 1, 1875 |
| 44th Congress | 1st Session | December 20, 1875 |
| 44th Congress | 1st Session | January 22, 1876 |
| 44th Congress | 1st Session | August 12, 1876 |
| 44th Congress | 2nd Session | December 13, 1876 |
| 44th Congress | 2nd Session | February 1, 1877 |
| 45th Congress | 1st Session | October 18, 1877 |
| 45th Congress | 2nd Session | December 10, 1877 |
| 45th Congress | 2nd Session | February 7, 1878 |
| 45th Congress | 2nd Session | June 10, 1878 |
| 45th Congress | 3rd Session | December 9, 1878 |
| 45th Congress | 3rd Session | January 29, 1879 |
| 46th Congress | 1st Session | April 12, 1879 |
| 46th Congress | 2nd Session | December 6, 1879 |
| 46th Congress | 2nd Session | January 29, 1880 |
| 46th Congress | 2nd Session | May 20, 1880 |
| 46th Congress | 3rd Session | December 10, 1880 |
| 46th Congress | 3rd Session | January 21, 1881 |
| 47th Congress | 1st Session | December 21, 1881 |
| 47th Congress | 1st Session | February 1, 1882 |
| 47th Congress | 1st Session | June 28, 1882 |
| 47th Congress | 2nd Session | December 11, 1882 |
| 47th Congress | 2nd Session | February 3, 1883 |
| 48th Congress | 1st Session | December 24, 1883 |
| 48th Congress | 1st Session | February 15, 1884 |
| 48th Congress | 1st Session | June 30, 1884 |
| 48th Congress | 2nd Session | December 10, 1884 |
| 48th Congress | 2nd Session | February 11, 1885 |
| 49th Congress | 1st Session | December 17, 1885 |
| 49th Congress | 1st Session | January 16, 1886 |
| 49th Congress | 1st Session | May 15, 1886 |
| 49th Congress | 2nd Session | December 11, 1886 |
| 49th Congress | 2nd Session | February 5, 1887 |
| 50th Congress | 1st Session | December 3, 1887 |
| 50th Congress | 1st Session | January 15, 1888 |
| 50th Congress | 1st Session | April 15, 1888 |
| 50th Congress | 2nd Session | December 7, 1888 |
| 50th Congress | 2nd Session | January 25, 1889 |
| 51st Congress | 1st Session | December 5, 1889 |
| 51st Congress | 1st Session | January 25, 1890 |
| 51st Congress | 1st Session | May 10, 1890 |
| 51st Congress | 2nd Session | December 3, 1890 |
| 51st Congress | 2nd Session | January 15, 1891 |
| 52nd Congress | 1st Session | December 5, 1891 |
| 52nd Congress | 1st Session | January 29, 1892 |
| 52nd Congress | 1st Session | May 7, 1892 |
| 52nd Congress | 2nd Session | December 12, 1892 |
| 52nd Congress | 2nd Session | February 10, 1893 |
| 53rd Congress | 1st Session | August 7, 1893 |
| 53rd Congress | 1st Session | October 10, 1893 |
| 53rd Congress | 2nd Session | December 1, 1893 |
| 53rd Congress | 2nd Session | February 1, 1894 |
| 53rd Congress | 2nd Session | May 1, 1894 |
| 53rd Congress | 3rd Session | December 1, 1894 |
| 53rd Congress | 3rd Session | February 1, 1895 |
| 53rd Congress | Extraordinary Session | April 20, 1893 |
| 54th Congress | 1st Session | December 7, 1895 |
| 54th Congress | 1st Session | January 15, 1896 |
| 54th Congress | 1st Session | April 22, 1896 |
| 54th Congress | 2nd Session | December 12, 1896 |
| 54th Congress | 2nd Session | January 22, 1897 |
| 55th Congress | Extraordinary Session | March 12, 1897 |
| 55th Congress | Extraordinary Session | June 24, 1897 |
| 55th Congress | 2nd Session | December 13, 1897 |
| 55th Congress | 2nd Session | February 21, 1898 |
| 55th Congress | 3rd Session | December 5, 1898 |
| 55th Congress | 3rd Session | January 12, 1899 |
| 56th Congress | 1st Session | December 8, 1899 |
| 56th Congress | 1st Session | January 10, 1900 |
| 56th Congress | 1st Session | April 18, 1900 |
| 56th Congress | 2nd Session | November 27, 1900 |
| 56th Congress | 2nd Session | January 8, 1901 |
| 57th Congress | 1st Session | December 5, 1901 |
| 57th Congress | 1st Session | January 16, 1902 |
| 57th Congress | 1st Session | April 11, 1902 |
| 57th Congress | 2nd Session | November 26, 1902 |
| 57th Congress | 2nd Session | January 5, 1903 |
| 58th Congress | Special Session | March 3, 1903 |
| 58th Congress | Extraordinary Session | November 5, 1903 |
| 58th Congress | 2nd Session | December 4, 1903 |
| 58th Congress | 2nd Session | January 21, 1904 |
| 58th Congress | 2nd Session | April 1, 1904 |
| 58th Congress | 3rd Session | December 1, 1904 |
| 58th Congress | 3rd Session | January 6, 1905 |
| 59th Congress | 1st Session | December 6, 1905 |
| 59th Congress | 1st Session | January 10, 1906 |
| 59th Congress | 1st Session | April 3, 1906 |
| 59th Congress | 2nd Session | November 30, 1906 |
| 59th Congress | 2nd Session | January 9, 1907 |
| 60th Congress | 1st Session | December 4, 1907 |
| 60th Congress | 1st Session | January 20, 1908 |
| 60th Congress | 1st Session | April 15, 1908 |
| 60th Congress | 2nd Session | December 3, 1908 |
| 60th Congress | 2nd Session | January 6, 1909 |
| 61st Congress | 1st Session | March 22, 1909 |
| 61st Congress | 2nd Session | December 3, 1909 |
| 61st Congress | 2nd Session | January 17, 1910 |
| 61st Congress | 2nd Session | April 7, 1910 |
| 61st Congress | 3rd Session | November 29, 1910 |
| 61st Congress | 3rd Session | January 18, 1911 |
| 62nd Congress | 1st Session | May, 1911 |
| 62nd Congress | 2nd Session | December, 1911 |
| 62nd Congress | 2nd Session | January, 1912 |
| 62nd Congress | 2nd Session | April, 1912 |
| 62nd Congress | 3rd Session | December, 1912 |
| 62nd Congress | 3rd Session | January, 1913 |
| 63rd Congress | 1st Session | April, 1913 |
| 63rd Congress | 2nd Session | December, 1913 |
| 63rd Congress | 2nd Session | February, 1914 |
| 63rd Congress | 2nd Session | May, 1914 |
| 63rd Congress | 3rd Session | December, 1914 |
| 63rd Congress | 3rd Session | January, 1915 |
| 64th Congress | 1st Session | December, 1915 |
| 64th Congress | 1st Session | January, 1916 |
| 64th Congress | 1st Session | May, 1916 |
| 64th Congress | 2nd Session | December, 1916 |
| 64th Congress | 2nd Session | January, 1917 |
| 65th Congress | 1st Session | April, 1917 |
| 65th Congress | 2nd Session | December, 1917 |
| 65th Congress | 2nd Session | January, 1918 |
| 65th Congress | 2nd Session | April, 1918 |
| 65th Congress | 3rd Session | December, 1918 |
| 65th Congress | 3rd Session | January, 1919 |
| 66th Congress | 1st Session | July, 1919 |
| 66th Congress | 2nd Session | December, 1919 |
| 66th Congress | 2nd Session | February, 1920 |
| 66th Congress | 2nd Session | May, 1920 |
| 66th Congress | 3rd Session | December, 1920 |
| 66th Congress | 3rd Session | January, 1921 |
| 67th Congress | 1st Session | May, 1921 |
| 67th Congress | 2nd Session | December, 1921 |
| 67th Congress | 2nd Session | February, 1922 |
| 67th Congress | 2nd Session | July, 1922 |
| 67th Congress | 4th Session | December, 1922 |
| 67th Congress | 4th Session | January, 1923 |
| 68th Congress | 1st Session | December, 1923 |
| 68th Congress | 1st Session | January, 1924 |
| 68th Congress | 1st Session | May, 1924 |
| 68th Congress | 2nd Session | December, 1924 |
| 68th Congress | 2nd Session | January, 1925 |
| 69th Congress | 1st Session | December, 1925 |
| 69thCongress | 1st Session | January, 1926 |
| 69th Congress | 2nd Session | December, 1926 |
| 69th Congress | 2nd Session | January, 1927 |
| 70th Congress | 1st Session | December, 1927 |
| 70th Congress | 1st Session | January, 1928 |
| 70th Congress | 2nd Session | December, 1928 |
| 70th Congress | 2nd Session | January, 1929 |
| 71st Congress | 1st Session | May, 1929 |
| 71st Congress | 2nd Session | December, 1929 |
| 71st Congress | 2nd Session | January 18, 1930 |
| 71st Congress | 3rd Session | November 21, 1930 |
| 71st Congress | 3rd Session | January 9, 1931 |
| 72nd Congress | 1st Session | November 27, 1931 |
| 72nd Congress | 1st Session | January 15, 1932 |
| 72nd Congress | 2nd Session | November 23, 1932 |
| 72nd Congress | 2nd Session | January 13, 1933 |
| 73rd Congress | 1st Session | June 3, 1933 |
| 73rd Congress | 2nd Session | December 21, 1933 |
| 73rd Congress | 2nd Session | May 4, 1934 |
| 74th Congress | 1st Session | December 20, 1934 |
| 74th Congress | 1st Session | March 21, 1935 |
| 74th Congress | 2nd Session | December 21, 1935 |
| 74th Congress | 2nd Session | April 17, 1936 |
| 75th Congress | 1st Session | December 20, 1936 |
| 75th Congress | 1st Session | February 18, 1937 |
| 75th Congress | 3rd Session | December 21, 1937 |
| 75th Congress | 3rd Session | May 5, 1938 |
| 76th Congress | 1st Session | December 20, 1938 |
| 76th Congress | 1st Session | March 23, 1939 |
| 76th Congress | 3rd Session | December 19, 1939 |
| 76th Congress | 3rd Session | June 6, 1940 |
| 77th Congress | 1st Session | April 23, 1941 |
| 77th Congress | 1st Session | December 19, 1940 |
| 77th Congress | 2nd Session | December 19, 1941 |
| 77th Congress | 2nd Session | May 26, 1942 |
| 78th Congress | 1st Session | December 21, 1942 |
| 78th Congress | 1st Session | May 14, 1943 |
| 78th Congress | 2nd Session | December 21, 1943 |
| 78th Congress | 2nd Session | June 2, 1944 |
| 79th Congress | 1st Session | August 14, 1945 |
| 79th Congress | 1st Session | February 2, 1945 |
| 79th Congress | 2nd Session | January 1, 1946 |
| 79th Congress | 2nd Session | June 29, 1946 |
| 80th Congress | 1st Session | February 14, 1947 |
| 80th Congress | 1st Session | June 11, 1947 |
| 80th Congress | 2nd Session | December 13, 1947 |
| 80th Congress | 2nd Session | May 19, 1948 |
| 81st Congress | 1st Session | February 15, 1949 |
| 81st Congress | 2nd Session | |
| 82nd Congress | 1st Session | |
| 82nd Congress | 2nd Session | |
| 83rd Congress | 1st Session | |
| 83rd Congress | 2nd Session | January 18, 1954 |
| 84th Congress | 1st Session | February 14, 1955 |
| 84th Congress | 2nd Session | |
| 85th Congress | 2nd Session | |
| 85th Congress | 2nd Session | |
| 86th Congress | 1st Session | |
| 86th Congress | 2nd Session | |
| 87th Congress | 1st Session | |
| 88th Congress | 1st Session | |
| 88th Congress | 2nd Session | |
| 89th Congress | 1st Session | |
| 89th Congress | 2nd Session | |
| 90th Congress | 1st Session | February 28, 1967 |
| 90th Congress | 2nd Session | December 15, 1967 |
| 91st Congress | 1st Session | |
| 91st Congress | 2nd Session | December 15, 1969 |
| 92nd Congress | 1st Session | March 10, 1971 |
| 92nd Congress | 2nd Session | December 3, 1971 |
| 93rd Congress | 2nd Session | December 22, 1973 |
| 94th Congress | 2nd Session | |
| 95th Congress | 1st Session | March 25, 1977 |
| 96th Congress | 1st Session | March 23, 1979 |
| 97th Congress | April 1, 1981 | |
| 98th Congress | March 31, 1983 | |
| 99th Congress | April 5, 1985 | |
| 100th Congress | April 15, 1987 | |
| 101st Congress | April 18, 1989 | |
| 102nd Congress | ||
| 103rd Congress | ||
| 104th Congress | ||
| 105th Congress | ||
| 106th Congress | ||
| 107th Congress | ||
