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Seal Motto: Live Large. Think Big.

Location in Dallas County and the state of Texas Coordinates: 32°46'58?N 96°48'14?W? / ?32.78278, -96.80389 Country United States of America State Texas Counties Dallas Collin Denton Rockwall Kaufman Incorporated 2 February 1856 Government  - Mayor Tom Leppert Area  - City 385.0 sq mi (997.1 km?)  - Land 342.5 sq mi (887.2 km?)  - Water 42.5 sq mi (110.0 km?) Elevation 430 ft (131 m) Population (2006)  - City 1,232,940 (9th)  - Density 3,605.08/sq mi (1,391.9/km?)  - Metro 6,003,967 Time zone Central (UTC-6)  - Summer (DST) Central (UTC-5) Area code(s) 214, 469, 972 FIPS code 48-19000[1] GNIS feature ID 1380944[2] Website: http://www.dallascityhall.com Dallas (pronounced /'d?l?s/) is the third-largest (as estimated by the United States Census Bureau on 1 July 2006) city in the state of Texas and the ninth-largest in the United States. The city covers 385 square miles (997 km?) and is the county seat of Dallas County.[3] As of July 1, 2006, U.S. Census estimates put central Dallas at a population of over 1.2 million.[4]The city is the main economic center of the 12-county Dallas?Fort Worth metropolitan area?at 6 million people, it is the fourth-largest metropolitan area in the United States. Dallas is listed as a gamma world city by the Loughborough University Globalization and World Cities Study Group & Network.[5] Dallas was founded in 1841 and formally incorporated as a city on 2 February 1856. The city's economy is primarily based on the petroleum industry, telecommunications, computer technology, banking, and transportation. It is the core of the largest inland metropolitan area in the United States and lacks any navigable link to the sea[6]?Dallas's prominence despite this comes from its historical importance as a center for the oil and cotton industries, its position along numerous railroad lines, and a strong industrial and financial sector.[7]