"A Family Community For a Lifetime" Coppell is a thriving community nestled in the northwest portion of Dallas County and southern Denton County, Texas. Coppell's 14.9 square miles are bounded by the cities of Grapevine, Lewisville, Flower Mound, Carrollton and Irving. Coppell also surrounds on three sides a non-contiguous portion of the City of Dallas. DFW International Airport has property within the city limits of Coppell in the southwest portion of the city.