Seagoville is a city in Dallas County, Texas, United States, and a suburb of Dallas. It has a population of about 15.000. The city was established in 1876 and it was initially called Seago. The change was made in order not to have two cities on the same day. The median income of a family living in Seagoville is $45.000. The city is also where the Federal Correctional Institution, Seagoville is located. It was also a site of an Immigration and Naturalization Service detention camp for Japanese, German and Italian Americans classified as "enemy aliens" and women of Japanese and German ancestry deported from Latin America, during WW2.