| State: | Pennsylvania |
| District: | 12 |
| Chamber: | Senate |
| Representative: | Maria Collett |
| Party: | Democratic |
| Residence: | Lower Gwynedd Township |
| Population: | 263,688 |
| Population Year: | 2021 |
Pennsylvania State Senate District 12 includes part of Montgomery County. It is currently represented by Democrat Maria Collett.
The district includes the following areas:[1]
| Representative[2] | Party | Years | District home | Note | |
|---|---|---|---|---|---|
| Alexander Dysart | Democratic-Republican | 1815 - 1820 | |||
| Michael Wallace | Democratic-Republican | 1819 - 1822 | |||
| Henry Winter[3] | Democratic | 1831 - 1832 | |||
| 1825 - 1830 | U.S. Representative for Pennsylvania's 7th congressional district from 1831 to 1833 and Pennsylvania's 8th congressional district from 1833 to 1835[4] | ||||
| William G. Scott | Democratic | 1827 - 1830 | |||
| Walter Copake Livingston | Democratic | 1831 - 1832 | |||
| Jacob Kern | Buchanan Democrat | 1831 - 1836 | |||
| Democratic | 1833 - 1836 | Pennsylvania State Representative from 1817 to 1819, 1824 to 1825 and 1829. U.S. Representative for Pennsylvania's 8th congressional district from 1839 to 1843[5] | |||
| Peter S. Michler[6] | Anti-Masonic | 1835 - 1836 | |||
| Robert P. Fleming | Democratic | 1839 - 1842 | |||
| Joseph Fearon Quay, Sr. | Whig | 1843 - 1844 | |||
| Jesse C. Horton[7] | Democratic | 1851 - 1852 | |||
| William Harris | Whig | 1847 - 1848 | |||
| Henry Fulton | Democratic | 1851 - 1852 | Pennsylvania State Senator for the 17th district from 1849 to 1850[8] | ||
| Democratic | 1851 - 1852 | Pennsylvania State Representative in 1847. 14th Governor of Pennsylvania from 1858 to 1861[9] | |||
| Democratic-Republican | 1853 - 1856 | Pennsylvania State Representative from 1850 to 1851. Minister Resident of the United States at Stockholm from 1861 to 1864[10] | |||
| Henry Johnson | Republican | 1861 - 1864 | |||
| Jasper Billings Stark[11] | Democratic | 1865 - 1866 | |||
| Republican | 1867 - 1870 | U.S. Representative for Pennsylvania's 12th congressional district from 1871 to 1875[12] | |||
| Samuel G. Turner | Democratic | 1869 - 1870 | |||
| Jacob George Heilman[13] | Republican | 1873 - 1874 | |||
| Williams Anders Yeakle | Republican | 1873 - 1876 | |||
| Jones Detwiler | Democratic | 1877 - 1878 | |||
| Lewis Royer | Republican | 1879 - 1882 | |||
| William Henry Sutton | Democratic | 1883 - 1885 | |||
| Henry Riehle Brown | Republican | 1889 - 1890 | |||
| Arthur D. Markley | Democratic | 1891 - 1894 | |||
| Henry D. Saylor | Republican | 1895 - 1898 | |||
| John Adams Wentz | Democratic | 1899 - 1902 | |||
| Algernon B. Roberts | Republican | 1903 - 1908 | |||
| Thomas B. Harper | Republican | 1909 - 1910 | |||
| Joseph Heacock | Democratic | 1911 - 1914 | |||
| Frank Penrose Croft | Republican | 1915 - 1916 | |||
| James Slingluff Boyd[14] | Republican | 1919 - 1922 | |||
| Wilbur Fletcher Stites | Republican | 1923 - 1926 | |||
| Republican | 1927 - 1936 | ||||
| Theodore Lane Bean | Republican | 1935 - 1938 | |||
| Franklin Spencer Edmonds | Republican | 1939 - 1944 | |||
| Republican | 1947 - 1950 | Pennsylvania State Representative for Montgomery County from 1939 to 1946. 20th Lieutenant Governor of Pennsylvania from 1951 to 1955[15] | |||
| Republican | 1951 - 1964 | ||||
| Republican | 1964 - 1964 | Blue Bell | Pennsylvania State Representative for the Montgomery County district from 1957 to 1964. Elected to the Pennsylvania State Senate on April 28, 1964[16] and resigned on July 2, 1964[17] | ||
| Republican | 1964 - 1978 | Pennsylvania State Representative for Montgomery County from 1963 to 1964[18] | |||
| Republican | 1979 - 2019 | Upper Moreland Township | Pennsylvania State Representative for the 152nd district from 1977 to 1978[19] | ||
| Democratic | 2019 - present | Lower Gwynedd Township | On November 6, 2018, Maria Collett (D) defeated Stewart Greenleaf, Jr. in his bid to succeed his retiring father.[20] |