The Wolfram Language provides seamless access to the curated and continuously updated Wolfram Knowledgebase, which includes a wide range of types of socioeconomic and demographic data. Free-form linguistics provides a convenient mechanism for accessing all available data; more common categories also have specific associated Wolfram Language functions.
EntityValue — general access to values of properties for all types of entities
CountryData — over a thousand properties and time series for all countries and territories
AdministrativeDivisionData — worldwide data on states, counties, provinces, etc.
CityData — properties of 250,000+ cities around the world
LanguageData — data on human languages & their usage