[This is a fast-access FAQ excerpt.]
From the Encyclopaedia Britannica 1995 yearbook, Bob Cunningham
estimated the number of mother-tongue English-speakers in the world
at 326,652,000, of whom 69% live in the United States.
Information on the distribution of English-speakers throughout
the world can be found at:
<http://www.sil.org/ethnologue/lookup?ENG>
and in the CIA World Fact Book [...]
[The CIA World Fact Book is now at
<https://www.cia.gov/library/publications/the-world-factbook/>.]
[See a tabulation showing numbers of English speakers in many
countries of the world. The tabulation uses data taken from the
1995 Britannica Book of the Year. It shows for each
country the number of mother-tongue English speakers and the
number speaking English as a second language.]