Dallas ( /ˈdæləs/) is the third-largest city in the state of Texas and the ninth-largest in the United States. The Dallas-Fort Worth metroplex is the largest metropolitan area in the South and fourth-largest metropolitan area in the United States. Divided between Collin, Dallas, Denton, Kaufman, and Rockwall counties, the city had a population of 1,197,816 in 2010, according to the United States Census Bureau.

The city is the largest economic center of the 12-county Dallas–Fort Worth–Arlington metropolitan area (the DFW MSA) that according to the March 2010 U.S. Census Bureau release, had a population of 6,371,773. The metroplex economy is the sixth largest in the United States, with a 2010 gross metropolitan product of $374 billion.

Dallas was founded in 1841 and was formally incorporated as a city in February 1856. The city's economy is primarily based on banking, commerce, telecommunications, computer technology, energy, healthcare and medical research, transportation and logistics. The city is home to the third largest concentration of Fortune 500 companies in the nation. Located in North Texas and a major city in the American South, Dallas is the main core of the largest inland metropolitan area in the United States that lacks any navigable link to the sea.

A missing person is a person who has disappeared for usually unknown reasons.

Missing persons' photographs may be posted on bulletin boards, milk cartons, postcards, and websites, along with a phone number to be contacted if a sighting has been made.

People disappear for many reasons. Some individuals choose to disappear alone; most of these soon return. Reasons for non-identification may include:

By the end of 2005, there were 109,531 active missing person records according to the US Department of Justice. Children under the age of 18 account for 58,081 (53.03%) of the records and 11,868 (10.84%) were for young adults between the ages of 18 and 20.

During 2005, 834,536 entries were made into the National Crime Information Center's missing person file, which was an increase of 0.51% from the 830,325 entered in 2004. Missing Person records that were cleared or canceled during the same period totaled 844,838. The reasons for these removals include: a law enforcement agency located the subject, the individual returned home, or the record had to be removed by the entering agency due to a determination that the record is invalid.