Although Jews make up 2 percent of the U.S. population, nearly 7 percent of the new Congress is Jewish, with 37 Jews among the total of 535 lawmakers. In the Senate, the 9 Jewish members comprise 9 percent of that body; 28 Jews comprise 5 percent of the House. The record was the 1993 Congress, which included 51 Jews — nearly 10 percent of the total.

All of the Jews in the Senate are Democrats, as are all but two in the House. The Republican exceptions are Reps. Lee Zeldin and David Kustoff, from New York and Tennessee, respectively. They are the only non-Christian Republicans in the Congress, according to a report by Pew.

https://www.jewishvirtuallibrary.org/jewish-members-of-the-116th-congress

The 1st Jewish member was elected in 1844, so ~180 years ago.

Levin began gaining notoriety in Philadelphia in the later 1830's for his public crusades on the evils of alcohol and against Catholic political power. In 1843, Levin founded the American Republic Party (later called the Native American Party) and shortly in 1844 he ran for Congress and was elected. His party's platform called for extending the period of naturalization to twenty-one years; election of only native born Americans to all offices; and, rejection of foreign interference in all institutions, social, religious and political.