The Domestic and International Common Language (DICL) Database

We construct a new global database on common language. The data cover 242 countries and territories and are based on information about the speakers of 6,674 languages. We provide 8 bilateral measures reflecting different dimensions of linguistic connections, including common official languages, common native and acquired languages, and linguistic proximity across different languages. A key novelty of the dataset is that it includes consistently defined information on linguistic relationships not only between different countries but within the administrative borders of countries as well.