| No. of Congress. | No. of Session. | Time of Session. |
| 1st | 1st | March 4, 1789—September 29, 1789 |
| 2d | January 4, 1790—August 12, 1790 |
| 3d | December 6, 1790—March 3, 1791 |
| 2d | 1st | October 24, 1791—May 8, 1792 |
| 2d | November 5, 1792—March 2, 1793 |
| 3d | 1st | December 2, 1793—June 9, 1794 |
| 2d | November 3, 1794—March 3, 1795 |
| 4th | 1st | December 7, 1795—June 1, 1796 |
| 2d | December 5, 1796—March 3, 1797 |
| 5th | 1st | May 15, 1797—July 10, 1797 |
| 2d | November 13, 1797—July 16, 1798 |
| 3d | December 3, 1798—March 3, 1799 |
| 6th | 1st | December 2, 1799—May 14, 1800 |
| 2d | November 17, 1880—March 3, 1801 |
| 7th | 1st | December 7, 1801—May 3, 1802 |
| 2d | December 6, 1802—March 3, 1803 |
| 8th | 1st | October 17, 1803—March 27, 1804 |
| 2d | November 5, 1804—March 3, 1805 |
| 9th | 1st | December 2, 1805—April 21, 1806 |
| 2d | December 1, 1806—March 3, 1807 |
| 10th | 1st | October 26, 1807—April 25, 1808 |
| 2d | November 7, 1808—March 3, 1809 |
| 11th | 1st | May 22, 1809—June 28, 1809 |
| 2d | November 27, 1809—May 1, 1810 |
| 3d | December 3, 1810—March 3, 1811 |
| 12th | 1st | November 4, 1811—July 6, 1812 |
| 2d | November 2, 1812—March 3, 1813 |
| 13th | 1st | May 24, 1813—August 2, 1813 |
| 2d | December 6, 1813—April 18, 1814 |
| 3d | September 19, 1814—March 3, 1815 |
| 14th | 1st | December 4, 1815—April 30, 1816 |
| 2d | December 2, 1816—March 3, 1817 |
| 15th | 1st | December 1, 1817—April 20, 1818 |
| 2d | November 16, 1818—March 3, 1819 |
| 16th | 1st | December 6, 1819—May 15, 1820 |
| 2d | November 13, 1820—March 3, 1821 |
| 17th | 1st | December 3, 1821—May 8, 1822 |
| 2d | December 2, 1822—March 3, 1823 |
| 18th | 1st | December 1, 1823—May 27, 1824 |
| 2d | December 6, 1824—March 3, 1825 |
| 19th | 1st | December 5, 1825—May 22, 1826 |
| 2d | December 4, 1826—March 3, 1827 |
| 20th | 1st | December 3, 1827—May 26, 1828 |
| 2d | December 1, 1828—March 3, 1829 |
| 21st | 1st | December 7, 1829—May 31, 1830 |
| 2d | December 6, 1830—March 3, 1831 |
| 22d | 1st | December 5, 1831—July 16, 1832 |
| 2d | December 3, 1832—March 3, 1833 |
| 23d | 1st | December 2, 1833—June 30, 1834 |
| 2d | December 1, 1834—March 3, 1835 |
| 24th | 1st | December 7, 1835—July 4, 1836 |
| 2d | December 5, 1836—March 3, 1837 |
| 25th | 1st | September 4, 1837—October 16, 1837 |
| 2d | December 4, 1837—July 9, 1838 |
| 3d | December 3, 1838—March 3, 1839 |
| 26th | 1st | December 2, 1839—July 21, 1840 |
| 2d | December 7, 1840—March 3, 1841 |
| 27th | 1st | May 31, 1841—September 13, 1841 |
| 2d | December 6, 1841—August 31, 1842 |
| 3d | December 5, 1842—March 8, 1843 |
| 28th | 1st | December 4, 1843—June 17, 1844 |
| 2d | December 2, 1844—March 3, 1845 |
| 29th | 1st | December 1, 1845—August 10, 1846 |
| 2d | December 7, 1846—March 3, 1847 |
| 30th | 1st | December 6, 1847—August 14, 1848 |
| 2d | December 4, 1848—March 3, 1849 |
| 31st | 1st | December 3, 1849—September 30, 1850 |
| 2d | December 2, 1850—March 3, 1851 |
| 32d | 1st | December 1, 1851—August 31, 1852 |
| 2d | December 6, 1852—March 3, 1853 |
| 33d | 1st | December 2, 1853—August 7, 1854 |
| 2d | December 4, 1854—March 3, 1855 |
| 34th | 1st | December 5, 1855—August 18, 1856 |
| 2d | August 21, 1856—August 30, 1856 |
| 3d | December 1, 1856—March 3, 1857 |
| 35th | 1st | December 7, 1857—June 14, 1858 |
| 2d | December 6, 1858—March 3, 1859 |
| 36th | 1st | December 5, 1859—June 25, 1860 |
| 2d | December 3, 1860—March 4, 1861 |
| 37th | 1st | July 4, 1861—August 6, 1861 |
| 2d | December 2, 1861—July 17, 1862 |
| 3d | December 1, 1862—March 4, 1863 |
| 38th | 1st | December 7, 1863—July 4, 1864 |
| 2d | December 5, 1864—March 4, 1865 |
| 39th | 1st | December 4, 1865—July 28, 1866 |
| 2d | December 3, 1866—March 4, 1867 |
| 40th | 1st | March 4, 1867—March 30, 1867 |
| „ | July 3, 1867—July 20, 1867 |
| „ | November 21, 1867—December 2, 1867 |
| 2d | December 2, 1867—July 27, 1868 |
| 3d | December 7, 1868—March 4, 1869 |
| 41st | 1st | March 4, 1869—April 23, 1869 |
| 2d | December 6, 1869—July 15, 1870 |
| 3d | December 5, 1870—March 4, 1871 |
| 42d | 1st | March 4, 1871—April 20, 1871 |
| 2d | December 4, 1871—June 10, 1872 |
| 3d | December 2, 1872—March 4, 1873 |
| 43d | 1st | December 1, 1873—June 23, 1874 |
| 2d | December 7, 1874—March 4, 1875 |
| 44th | 1st | December 6, 1875—August 15, 1876 |
| 2d | December 4, 1876—March 4, 1877 |
| 45th | 1st | October 15, 1877—December 3, 1877 |
| 2d | December 3, 1877—June 20, 1878 |
| 3d | December 2, 1878—March 4, 1879 |
| 46th | 1st | March 18, 1879—July 1, 1879 |
| 2d | December 1, 1879—June 16, 1880 |
| 3d | December 6, 1880—March 4, 1881 |
| 47th | 1st | December 5, 1881—August 8, 1882 |
| 2d | December 4, 1882—March 4, 1883 |
| 48th | 1st | December 3, 1883—July 7, 1884 |
| 2d | December 1, 1884—March 4, 1885 |
| 49th | 1st | December 7, 1885—August 5, 1886 |
| 2d | December 6, 1886—March 4, 1887 |
| 50th | 1st | December 5, 1887—October 20, 1888 |
| 2d | December 3, 1888—March 4, 1889 |
| 51st | 1st | December 2, 1889—October, 1890 |
| 2d | December 1, 1890—March 4, 1891 |