English: Functional and official english language map. Sources: Wikipedia-internal: Principly from List_of_countries_where_English_is_an_official_language and the country page of each nation, but also including List_of_countries_by_English-speaking_population.

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  official
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  co-official
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  de facto
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  effective use by majority
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  border despite it's legal status, english is virtually not spoken (10% or less of the population speak fluent english)
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  border a substantial percentage of the population can read and write english, but cannot speak the language

Controversy:

The Baltic countries and Chile and Argentina all have high numbers of people with extended exposure to english, but perhaps nonetheless they do not have a full grasp of the language. In chile, for example, it had been the requirement for students to study english throughout many years of school, yet the lack of english in daily life blunts the effectiveness of the program and chileans typically command (on the spot) only a basic-to-intermediate level of english. All the yellow states, and as well South Africa, are somewhat questionable depending on the sources involved and who you ask: none has a thorough, rural-inclusive census attached to a standards-compliant measure, as is common in europe. The african nations commonly have dozens if not hundreds of national languages, and while english is often official, it often is not spoken. For those countries where an english creole is common, in africa, the english creole is not considered english (against the custom at wikipedia) unless it is co-intelligible with a primarily english-language nation. The same is true for Japan, seriously limiting the numbers of people there who in all fairness are said to basically understand english.