Located roughly halfway between the major cities of Dallas and Fort Worth, DFW spills across portions of Dallas and Tarrant counties, and includes portions of the cities of Irving, Euless, Grapevine and Coppell. At , DFW is larger than the island of Manhattan, and is the second largest airport by land area in the United States, after Denver International Airport. It has its own post office ZIP Code, 75261, and United States Postal Service city designation ("DFW Airport, TX"), as well as its own police, fire protection, and emergency medical services.