Congregation Beth Israel, Andover, MA. 1342 plaques total.
Photo of synagogue.
See linked chart showing synagogue merger history, and also http://www.jgsgb.org/pdfs/MassSynagogues.pdf where Cong. Anshe Sfard, Lawrence is #321, Cong. Tifereth Israel Lawrence is #330, Cong. Tifereth Israel Anshe Sfard Lawrence is #328; Cong Anshay Sfard Ayer is #15, Cong Sons of Israel Lawrence is #326, Cong Beth El Lowell is #343, Cong Tifereth Israel Anshai Sfard Sons of Israel Lowell & Andover is #329 & #9, and Cong Beth Israel Andover is #5. Current synagogue website: http://www.bethisraelmv.org/