The map, which the Sweden Democrats have launched on their own website, is based on data from Statistics Sweden, which defines a person with foreign background as an individual born abroad or born in Sweden to two foreign parents.
The migration map, however, also includes people who were born in Sweden to just one foreign parent.
Areas coloured in black, where 'immigrants', by the Sweden Democrats' definition, constitute more than 50 percent of the population, include Haparanda and Övertorneå at the far north of the country, Sigtuna, Upplands Väsby, Järfalla, Sundbyberg, Solna, Huddinge, Botkyrka, Södertälje, and Hanninge around Stockholm, and Malmö in southern Sweden.
Under Weimers' definition, any Swede with one foreign parent would count as an immigrant, meaning that the Swedish King, Queen and Crown Princess would all fall into this category, as would his party's own former secretary-general, Richard Jomshof, who was born to a Finnish father.
The high number of Swedes of Finnish descent living along the border with Finland is presumably one of the reasons the far north of the country is coloured black on the party's map.
Weimers said in an interview with Swedish newspaper Aftonbladet that it was only due to a "lack of resources" that the party had not been able to break down the numbers according to which country each person with an immigrant background's parents come from.
"It’s a very extensive task that would be required for that, and we simply don’t have the resources. So it’s simply a limitation we’ve been forced to make," he said.
Weimers stressed that there are "an enormous number of people in Sweden who grew up with one parent born overseas who are completely integrated".
"There are also cases that show the opposite," he continued. "We need to stop talking about integration and start talking about assimilation."
While Weimers did not use this phrase in his Facebook post launching the map, the illustrates the idea of a folkutbyte, or "population exchange", a term sometimes used in Swedish to refer the Great Replacement Theory that underpinned the deadly terror attack mounted by the Norwegian extremist Anders Breivik.
Weimers defended the Sweden Democrat's leader Jimmie Åkesson when he was criticised for using the term folkutbyte in an opinion article during the EU election in 2024, arguing that when "whole areas are being de-Swedified in Sweden", you "must be able to use the right word for it".
The Great Replacement Theory is a conspiracy theory populated by the French writer Renaud Camus, which argues that "replaceist elites" are importing non-Western immigrants to European nations in order to replace the population and so maintain control.
As well as influencing Breivik, the theory also influenced Brenton Tarrant, the man behind the Christchurch mosque shootings in New Zealand.
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