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The 1856–57 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1856 and 1857, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1876–77 United States Senate elections were held on various dates in various states, coinciding with Rutherford B. Hayes's narrow election as president. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1876 and 1877, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 2.
The 1878–79 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1878 and 1879, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1844–45 United States Senate elections were held on various dates in various states, coinciding with James K. Polk's election. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1844 and 1845, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 1.
The 1890–91 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1890 and 1891, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1866–67 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1866 and 1867, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1860–61 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1860 and 1861, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 3.
The 1814 United States Senate special election in Pennsylvania was held February 24, 1814. Jonathan Roberts was elected by the Pennsylvania General Assembly to the United States Senate.
The 1831 United States Senate special election in Pennsylvania was held on December 13, 1831. George M. Dallas was elected by the Pennsylvania General Assembly to the United States Senate.
The 1861 United States Senate special election in Pennsylvania was held on March 14, 1861. David Wilmot was elected by the Pennsylvania General Assembly to the United States Senate.
The 1905 United States Senate election in Pennsylvania was held on January 17, 1905. Incumbent Philander C. Knox was elected by the Pennsylvania State Assembly to his first full term in the United States Senate.
The 1909 United States Senate special election in Pennsylvania was held on March 16, 1909. George T. Oliver was elected by the Pennsylvania General Assembly to the United States Senate.
The 1801 United States Senate special election in Pennsylvania was held on December 17, 1801. George Logan was elected by the Pennsylvania General Assembly to the United States Senate.
The 1834 United States Senate special election in Pennsylvania was held on December 6, 1834. Future President of the United States James Buchanan was elected by the Pennsylvania General Assembly to the United States Senate.
The 1845 United States Senate special election in Pennsylvania was held on March 13, 1845. Simon Cameron was elected by the Pennsylvania General Assembly to the United States Senate.
The 1873 United States Senate election in Pennsylvania was held on January 21, 1873. Simon Cameron was re-elected by the Pennsylvania General Assembly to the United States Senate.
The 1879 United States Senate election in Pennsylvania was held on January 20, 1879. J. Donald Cameron was re-elected by the Pennsylvania General Assembly to the United States Senate.
The 1885 United States Senate election in Pennsylvania was held on January 20, 1885. J. Donald Cameron was re-elected by the Pennsylvania General Assembly to the United States Senate.
The 1891 United States Senate election in Pennsylvania was held on January 20, 1891. J. Donald Cameron was re-elected by the Pennsylvania General Assembly to the United States Senate.
The 1897 United States Senate election in Pennsylvania was held on January 19, 1897. Boies Penrose was elected by the Pennsylvania General Assembly to the United States Senate.