Allen is an affluent city in Collin County, Texas, a northern suburb of Dallas. As of the 2010 United States Census, the city had a total population of 84,246.

The Allen area was previously home to the Caddo, Comanche, and other indigenous peoples. The first immigrants from the United States and Europe arrived in the early 1840s. The town was established by the Houston and Central Texas Railroad and named in 1872 for Ebenezer Allen, a state politician and railroad promoter. The railroad allowed sale of crops across the country before they rotted, causing a shift from the previous cattle-based agriculture. On February 22, 1878, a gang led by Sam Bass committed in Allen what is said to be Texas's first train robbery.

From 1908 through 1948, Allen was a stop along the Texas Traction Company's interurban line from Denison to Dallas. Allen was a small town of a few hundred residents when it was incorporated in 1953. Since this time, it has grown dramatically due to the construction of U.S. Route 75, the Dallas/Fort Worth International Airport, and the development of nearby Dallas and Plano.

According to the City of Allen, the city has a total area of 27.1 square miles (70 km²). None of the area is covered with water except the small ponds scattered throughout the city.

Allen is part of the Humid Subtropical region, with hot dry summers and mild cold and rainy winters.

As of the 2010 Census, the city had a population of 84,246 people. The racial makeup of the city was 64.9% White, 8.4% African American, 0.5% Native American, 13.9% Asian, 0.1% Pacific Islander, 2.9% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 16.2% of the population.

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