A mission of The Church of Jesus Christ of Latter-day Saints (LDS Church) is a geographical administrative area to which church missionaries are assigned. Almost all areas of the world are within the boundaries of an LDS Church mission, whether or not Mormon missionaries live or proselytize in the area. As of July 2015, there are 418 missions of the LDS Church.
Geographically, a mission may be a city, a city and surrounding areas, a state or province, or perhaps an entire country or even multiple countries. Typically, the name of the mission is the name of the country (or state in the United States), and then the name of the city where the mission headquarters office is located. New missionaries receive a formal mission call, assigning them to a particular mission for the duration of their two years or eighteen months of service. Each mission has, on average, about 150 missionaries serving there.
All missionaries serve in a mission under the direction of a mission president, who, like individual missionaries, is assigned by the LDS Church president. The mission president must be a married high priest in the Melchizedek Priesthood; his wife is asked to serve alongside him. In 2013 the mission president's wife was given additional leadership roles in the mission. Mission presidents are typically in their forties or older, and usually have the financial means to devote themselves full-time to the responsibility for three consecutive years. The church provides mission presidents with a minimal living allowance but it normally requires them to supplement it with their own funds. Often, the mission president must learn the local language spoken in the mission, as the missionaries do (although many mission presidents today have either previously served a mission in the mission language or speak the mission language as their native language).
The mission president has at least two counselors, who are Latter-day Saints usually from the local area who keep their regular employment. The role of the counselors varies by mission, but they typically serve as liaisons between the mission and the local membership of the church. In some areas where the church is newer senior men who are serving full-time missions along with their wives may be called as counselors in the mission presidency.