During the Landshut War of Succession Weißenhorn came into possession of Holy Roman Emperor Maximilian I and became a provincial city of Further Austria.

Maximilian transferred the possession to Jacob Fugger in 1507, due to Weißenhorns delivered and reconfirmed privileges the sovereignty rights however remained with Austria.

The Fugger family, which held rule over centuries, promoted the local fustian weaving mill and made Weißenhorn into a flourishing commercial town.

The known bandit and murderer Matthias Klostermayr alias "The Bavarian Hiasl", who was up to mischief in the 18th century, was nearly imprisoned by the police of Roggenburg.

The gothic and later in the baroque style expanded church collapsed during the Wednesday liturgy on 22 February 1859, which resulted in eleven deaths.

Weißenhorn was - except for two airstrikes at the Wehrmacht's gasoline depot in the Eschach forest - mostly spared from the Second World War.

The following parties are present in the town council (24 seats) after the 2014 local elections: Besides this official partnership Weißenhorn is in close contact with the municipality of Prad am Stilfser Joch in South Tyrol (Italy).

Apart from that, exchange programs with students from Bangalore (India), Lyon (France) and Ecuador are regularly organized by the school.

Today's biggest employer is the company PERI GmbH (world market leader in Formwork and Scaffolding), which was founded in Weißenhorn in 1969.

Medieval citizen houses, some in framework construction, stately pubs and buildings from the 19th century show the tradition of a commercial town.