Upplands Väsby Municipality is a municipality in Stockholm County in east central Sweden, with a population of 38,963 . Its seat is located in the town of Upplands Väsby.The municipality was created in connection with the municipal reform of 1952, when the rural municipalities Ed, Fresta and Hammarby were amalgamated. It got its name from a settlement which had evolved around the railway station.The name Väsby can be attested from the 13th century. The prefix "Upplands" came to be used by the post station in 1919 as a means of separating it from other Väsbys in the country. The municipality was then named "Upplands-Väsby" for a time, but the dash has now been removed.Upplands Väsby is located in between Stockholm and Arlanda Airport, and the main line railroad goes through the municipality. There are local train services to Arlanda Airport, Uppsala, Stockholm Central Station and Älvsjö .GeographyThe land is covered with good soil, forests, and moraine. The western part border to a creek of the lake Mälaren (not visible on the map), which also marks the border to the municipality Upplands-Bro. There are also other water areas, such as streams and small lakes, in the municipality. One of them is the small river Väsbyån, flowing through Väsby, in which the uncommon fish asp swims.