Map - Sundbyberg Municipality (Sundbybergs Kommun)

Sundbyberg Municipality (Sundbybergs kommun or Sundbybergs stad) is a municipality in Stockholm County in east central Sweden, just north of the capital Stockholm. Sundbyberg is wholly within the Stockholm urban area and has a 100% urban population.

Sundbyberg was detached from Bromma (which since 1916 is in Stockholm Municipality) in 1888 as a market town (köping). It got the title of a city in 1927. In 1949 parts of Solna Municipality and Spånga Municipality (when the rest of Spånga was amalgamated into Stockholm) were added. A proposed merger with Solna in 1971 was never implemented, making Sundbyberg, with an area of 8.83 km2, the smallest municipality in Sweden, but also the most densely populated. The municipality prefers to call itself a city, which, however, has no legal significance.

Sundbyberg was for a long time only an area of small agriculture value and most of all used as a place to spend summer for rich families in the city. In 1863 almost the entire area was bought by Anders Petter Löfström, including Duvbo Estate, who began building houses there. In 1870 the first industrial plot was sold and from there the town did expand with railroad, houses, industries and community services of all kind. A. P. Löfström also donated to the municipality, all land for roads, streets, parks, school, church and other public areas.

In 1888 Sundbyberg municipality was formed with 1,133 inhabitants, splitting off from Bromma. At the time the municipality only constituted Central Sundbyberg and the undeveloped Storskogen. Sundbyberg was known in its early years for its beer, its spirited political discourses, its muddy streets, and the danger of the streets at night (nowadays the crime-hit areas are Hallonbergen and Rissne instead ). Sales of land was aimed at workers and industry, and the relative lack of public services caused a strong cooperative spirit to form. Suburbs bordering Sundbyberg were also built – Lilla Alby and Mariehäll in the 1880s and Duvbo around 1900. While trains stopped in Sundbyberg, they did so at a low frequency, and most commuters used the steam boat. In 1910 a tram line was built from Stockholm and Råsunda to the municipal border, and then into Sundbyberg in 1928, running until 1959.

A new city plan was established in 1941, prescribing the construction of lamellhus, rectangular multi-residential buildings with typically four floors, leading to the demolishment of most of the wooden houses in Sundbyberg in the 1940s, while brick or concrete buildings were kept. Many industrial buildings were converted to residential use at the same time. Rising housing prices led to a more densely built suburb than envisioned in the city plan, as well as cause Sundbyberg to rapidly lose its industrial character.

In 1946 Sundbyberg municipality, which by then had 15,000 inhabitants, bought Storskogen, with the first homes going up there in 1952. In 1949 Spånga municipality was split between neighbouring municipalities, giving Duvbo, Ursvik and some other land to Sundbyberg. Lilla Alby was transferred from Solna municipality to Sundbyberg at the same time. Since the 1950s when Storskogen was built, Sundbyberg has expanded one district each decade, with Ör built in the 1960s, Hallonbergen and its metro line (which also serves Storskogen and Ör) in the 1970s, Rissne and its metro line (which also serves Central Sundbyberg and Lilla Alby) in the 1980s, Brotorp and Stora Ursvik in the 2000s.