Sumario: | Post-marital residence in the groom’s household and inheritance of the house by the youngest son in Mexico are cultural practices of a type of social reproduction conceptualized as the Mesoamerican family system (MFS). The purpose of this article is to establish an approximate value of the volume of the MFS in Mexico based on data from the expanded questionnaire of the 2020 Population and Housing Census. Three empirical indicators of the MFS were introduced as variables in a statistical analysis model of principal components from which an index number of the presence of MFS was calculated at the municipal and state levels. Separately, the MFS indicator traits have a positive correlation with the percentage of indigenous language speakers, the degree of marginalization and the number of corn producers of the total population per municipality. It was found that 14.2% of the national population resides in municipalities with high or very high degrees of MFS. It is concluded that the presence of the MFS is distributed, roughly speaking, in the territory coinciding with that conventionally defined as the Mesoamerican cultural area.
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