DICL Language Database


The Domestic and International Common Language Database (DICL) contains bilateral measures of both international and domestic language similarity for 242 countries. The international measures reflect linguistic similarities between populations in different countries while the domestic measures reflect similarities among each country's domestic population.  The measures are derived from 6,674 individual languages and reflect three aspects of language connections including official languages, native and acquired spoken languages, and linguistic proximity between different languages.


Available for download from the U.S. International Trade Commission Gravity Portal  or Harvard Dataverse

Technical description 

Recommended Citation

Gurevich, Tamara, Peter Herman, Farid Toubal, and Yoto Yotov, (2024), “The Domestic and International Common Language (DICL) Database”, USITC Economics Working Paper 2024-03-A. (Link to Paper)

International Common Native Language (CNL) Linkages

Domestic Native Language Diversity