The most widely spoken in Europe is English.
The most spoken languages in Europe, with the numbers of speakers, are:
German 84 million (Germany + Austria + part of Switzerland)
French 70 million (France + part of Belgium + part of Switzerland)
English 67 million (UK + Ireland)
Italian 61 million (Italy)
Spanish 46 million (Spain)
The figures are calculated by adding the populations of the relevant countries. They are approximate only.
Russian should be somewhere in this list has about 150 million speakers, but I can find no figures which say how many of these are in Europe.
Source: Wikipedia article "List of European countries by population".
The main language spoken in Amsterdam is Dutch.
The main language spoken in Bali is Balinese.
The main language spoken in Portugal is Portuguese.
The main language spoken in Serbia is Serbian.
The main language spoken in the Netherlands is Dutch.
The main language spoken in Athens is Greek.
The main language spoken in Caracas is Spanish.
The three main language families of Europe are Indo-European, Finno-Ugric, and Basque. Indo-European languages are spoken throughout most of Europe, including English, Spanish, French, German, and Russian. Finno-Ugric languages are spoken mainly in Finland, Estonia, and parts of Hungary. Basque is spoken in the Basque Country region of Spain and France.
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What_are_the_10_most_commonly_spoken_languages_in_Europeshould help
in the US English in the main spoken language. Colorado is in the US
The main language spoken in Barcelona is Catalan.