The seat of the municipality is in Vallentuna, which is a contiguous built-up area, partly situated in Täby Municipality. There are also smaller localities, such as Brottby, Karby, Kårsta and Lindholmen.

Vallentuna has been expanding in recent years, and is one of the municipalities of the county that grows fastest every year, with more than 2% yearly, and has now doubled since 1971. Many people settle in Vallentuna because it is close to nature, and yet allows them to commute to their work places, both in (to where the commuter gets you in 30 minutes) and elsewhere. In total, about 9,000 people commute from Vallentuna to other municipalities, while about 2,000 people commute into Vallentuna.

The municipality is served by the through . There are nine stops on the narrow gauge Roslagsbanan suburban railway as well as a bus network.

All over the central part of Vallentuna you can find schools of different sorts, there is a cultureschool (Kulturskolan) that specialises in teaching music but also drama, musical and dance. Vallentunas "Högstadie skolor" (aimed for kids ages 12-16) are Hjälmstaskolan, Hammarbackskolan, Bällstabergsskolan and Vallentuna Friskola. There also is a Secondary School ("gymnasieskola"), Vallentuna Gymnasium.

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