He was president of the British Board of Deputies from 1835-1874, a period of 29 years, the longest tenure ever. Montefiore's 100th birthday was celebrated as a national event in his native Britain and by the Jewish community in Palestine.
A major source of information about the Jewish community in Palestine during the 19th century is a sequence of censuses commissioned by Montefiore, in 1839, 1849, 1855, 1866 and 1875. The censuses attempted to list every Jew individually, together with some biographical and social information (such as their family structure, place of origin, and degree of poverty).