In immigrant-receiving countries, immigrants are often concentrated in residential neighbourhoods with high concentrations of immigrants. In addition, they are concentrated in workplaces with high concentrations of immigrants. Many researchers have assumed that these are two sides of the same coin, so that policy affecting residential segregation could be expected to influence workplace segregation. Using Swedish register data for 2007, we directly assess whether immigrants who live in residential neighbourhoods concentrated with immigrants also work in firms concentrated with immigrants. We find that there is very little correlation between residential and workplace segregation, suggesting that policy could profitably target both types of segregation separately.