Founded in 1846, Dallas County is the historic and economic center of the Dallas-Fort Worth metroplex, with a population exceeding 2.7 million as of 2024, making it one of the most populous counties in Texas. Originally established as a trading post near the Trinity River, the county experienced rapid growth in the 19th and 20th centuries, driven by its strategic location as a railroad hub and later by the discovery of oil and the rise of finance, technology, and telecommunications industries. This development transformed Dallas County into a thriving metropolitan area with a diverse and robust economy that includes sectors such as healthcare, manufacturing, transportation, and corporate services.

The county's urban landscape is defined by its iconic skyline, featuring landmarks like the Bank of America Plaza and Renaissance Tower. Dallas County encompasses a wide range of communities and neighborhoods, from affluent residential areas and industrial zones, reflecting varied socioeconomic conditions. It is home to major educational institutions, healthcare facilities, and corporate headquarters that contribute to its status as a regional economic powerhouse. Additionally, Dallas County preserves significant historical sites such as Dealey Plaza—the location of President John F. Kennedy’s assassination—as well as the Old Red Museum and Dallas Heritage Village, which honor its pioneer and early settler history. With its rich historical roots and continuous economic growth, Dallas County remains a central pillar of the region’s development.