“Hebrew Institute of Riverdale is the smallest shul in Riverdale.”
The Hebrew Institute of Riverdale is the second largest congregation in Riverdale. I think the dues paying membership of HIR is around 500 families, and a large fraction were brought to Torah personally by Rabbi Weiss. The Riverdale Jewish Center (R’Rosenblatt) is larger, but the Young Israel of Riverdale (R’Willig) is smaller, as are Young Israel Ohab Zedek of North Riverdale/Yonkers (R’Hain), Chabad, the Talner Shul, Torah V’Chessed Nanash (a.k.a. the Shteeble), Beth Aharon, and Kingsbridge Center of Israel. (As are the Conservative synagogue, and the two Reform synagogues.)