Countries where English is an official language

    Note: English is not a de jure official language in the United Kingdom, United States, and Australia. Source: CIA World Factbook

    Greenberg's diversity index

    The probability that two randomly selected people in a country speak different mother tongues. The highest value is 100, meaning every person in the country speaks a different mother tongue. Papua New Guinea holds the top spot, with 98.8.

    (0) Least diverse

    Most diverse (100)

      Source: Ethnologue: Languages of the World, Eighteenth edition