Congregation Zera Israel (the Descendants of Israel) was organized on May 1, 1921 in a storefront, as a Lithuanian Orthodox synagogue. It was one of the Orthodox synagogues of West Denver. Rabbi Arthur L. Fine became the leader in 1979 and Morris B. Sapper and Julius Berger were presidents of the congregation. The collection contains Articles of Incorporation, Scrapbooks and Photographs, Events and Memorials.

The Talmudic Research Institute (TRI-Sulom Congregation) was an orthodox Chasidic synagogue and study center organized by Rabbi B. C. Shloime Twerski in 1970. He was succeeded in 1981 by his son Rabbi Mordecai D. Twerski. Rabbi Mordecai Twerski led the TRI-Sulom until returning to New York in 2000. The records consist of three annual fundraising dinner journals.