About 160 post offices, branch offices, rural agencies, travelling post offices, and town agencies operated, some only for a few months, others for the entire length of the period. Upon the advance of allied forces in 1917 and 1918 initially Field Post Offices and Army Post Offices served the local civilian population. Some of the latter offices were converted to Stationary Army Post Offices and became civilian post offices upon establishment of the civilian administration. In 1919 fifteen offices existed, rising to about 100 by 1939, and about 150 by the end of the Mandate in May 1948.
