 The per capita income was $38,304.About 5.2% of families and 7.9% of the population were below the poverty line, including 11.3% of those under age 18 and 5.5% of those age 65 or over.Grapevine uses a council–manager government, consisting of an elected city council, composed of the mayor and six at-large councilmembers, with a city manager appointed by the council.