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BACKGROUNDIntergenerational coresidence has important consequences for care provision for the young and the old. Given the rising concerns about population aging in South Korea, understanding intergenerational coresidence is very relevant. OBJECTIVEThis research describes evolving intergenerational coresidence patterns in South Korea between 1980 and 2015 through the lens of fertility decline, increased life expectancy, and changing marriage patterns. METHODSThe 1% micro data in the Korean census were used to describe changing co-residence patterns, and Sullivan's method was used to estimate the length and proportion of intergenerational coresidence. RESULTSCoresidence with parents decreased over time due to an increase in the proportion of older people. After controlling for age structure, the prevalence of parent coresidence increased due to a reduction in sibling size and delay in marriage. Coresidence with children changed little due to a decrease in the proportion of young people. After controlling for age structure, the prevalence of child coresidence decreased substantially due to fertility decline and delay in marriage. Whereas the proportion of lifetime coresidence with parents decreased modestly between 1980 and 2015, the proportion of lifetime coresidence with children almost halved.