Vallentuna is a bimunicipal locality and the seat of Vallentuna Municipality, Stockholm County, Sweden with 29,519 inhabitants in 2010. It stretches over two municipalities in Stockholm County, in the Roslagen region. Vallentuna is also a suburb of Stockholm. The part of the locality which is situated in Vallentuna Municipality is the seat of that municipality. The southern part, situated in Täby Municipality, is called Täby kyrkby. Vallentuna's cultural landscape is well-preserved, and human habitation in the area has been traced back as far as the stone age. Archeological excavations in southern Vallentuna near Lilla Gävsjö uncovered remains of a stone age settlement.