Is there greater ethnic mixing in residential or workplace spaces?

While much of the ethnic and racial segregation literature concentrates on residential neighbourhoods, a growing body of research demonstrates how levels of inter-ethnic mixing vary between home and other spaces, including workplace environments. Using alternative population bases from the 2011 Census for England and Wales, we explore how levels of ethnic segregation and diversity compare for working-age people in residential ('nighttime'), workday ('daytime') and workplace ('employment') environments. Analyses of Middle Layer Super Output Areas reveal that a larger number of these zones had low residential ethnic diversity than had low workday or workplace diversity. We also find higher levels of residential segregation than workplace segregation for all ethnic groups, including the White British (majority) and minoritised groups. Notable differences in segregation between residential and workplace spaces for the Pakistani and Bangladeshi ethnic groups, for example, demonstrate that more commonly applied measures of residential segregation fail to capture the extent of inter-ethnic mixing across spaces, and at different times of the day. Commuting data are analysed to explore the role of daily mobilities in shaping these patterns. The findings nuance understandings of levels of ethnic mixing, and emphasise the need for segregation analyses across multiple spatio-temporal contexts.