From 1850 until 1880 one or two Jews continuously served as elected officials. Hellman and Henry Huntington became the two financial giants of southern California.
In 1873 they took the initiative in organizing the first Chamber of Commerce. Hellman (1843–1920) ventured into the banking business to become ultimately the leading banker in Los Angeles and among the dominant financial powers in the state. In 1861 Beth El, a congregation of Polish Jews, was formed.
A few years later, the hospital was forced to move outside the city when the treatment of tuberculosis, its main business, was declared illegal within the city limits.
In 1911 the Jewish Consumptive Relief Association was established and began to build a sanitarium at Duarte for consumptives who came to seek relief; this evolved into today's City of Hope Medical Center.
The rapid increase of population created for the first time recognizably Jewish neighborhoods.
With the arrival of large numbers of Middle Westerners the easygoing, socially integrated society began to change. Jews established separate social outlets including a Young Men's Hebrew Association for the young and the Concordia Club for the card-playing parents.In 1900 the Los Angeles population was 102,000 and the Jews numbered 2,500.Twenty years later the Jews constituted 40,000 out of 576,000, and by 1930 the Jews numbered 70,000 out of 1,200,000.Ephraim Schreiber of Denver became the rabbi from 1884 to 1889; Abraham Blum, 1889–95; M. We commend them for their general business and personal probity…they are among our best citizens and the city suffers nothing in their hands…." The population of Los Angeles rose sharply during the 1880s with the arrival of the transcontinental railroad service and following a concerted program of promotion by the Chamber of Commerce.