Data presented in the publication concern quantity and quality changes in size and structure of the population, as well as the following topics: marriages, separations, divorces, births, deaths, migration, which enable to diagnose demographic situation of Mazowieckie voivodship in 2016. Moreover, the data allow for analysing different areas of socio-economic life, e.g. data on population by educational and economic age groups enable to determine influence of demographic factor on future of educational system, labour market, and pension benefits.