Sons of Jacob Synagogue, 411 E Mitchell Ave, Waterloo, IA, USA, 393 plaques total.
Sons of Jacob Synagogue (SOJ), https://www.sojonline.com, the subject of an award-winning 2013 documentary, https://www.imdb.com/title/tt2783918, was founded in Waterloo, IA in 1905. Naomi B McCormick and Erin Kaye Miller completed this database.
(Sons of Jacob Synagogue gives free access to everyone with a JewishGenID to view (but not duplicate or publish) information in this spreadsheet and relevant photographs. JewishGen users require written permission from the Board of Directors of Sons of Jacob, https://www.sojonline.com/, before they can duplicate, publish, or broadcast information provided here to third parties.)