Abstract The aim of this study is to examine segregation in the three Swedish municipalities of Uppsala, Gävle and Värmdö. The study attempts to describe the current situation in regards to segregation in the chosen municipalities, the reasons for this and what the municipalities can do to prevent further segregation. In an attempt to find answer to these questions, a literature study has been done and three semi structured interviews with planners working for the municipalities in question. The study shows that different socio economic groups are indeed spatially clustered and a big reason for this is historic decisions in regard to large scale planning and Sweden’s historic housing policies. The interviews show that there are many possible tools for a planner to use when trying to decrease segregation. A large focus is put on creating mixed types of housing in each part of the city and municipality. Creating places for social interaction and good communications are also an important part according to all interviewees. The challenges faced by the planners are lack of economic incentive, the limitations of the planning system and preferences of the population.