In which countries is German spoken?

Tysk er det eneste offisielle språket i Tyskland, Østerrike og Liechtenstein. Det er det viktigste av de fire språkene i Sveits. Også i Luxembourg har tysk offisiell status ved siden av fransk og luxemburgisk. I Belgia er tysk det minste av tre offisielle språk, og snakkes av 70 000 mennesker. I den italienske regionen Trentino-Alto Adige brukes tysk som offisielt språk ved siden av italiensk...

For some reason the Norwegian Wikipedia has a list of German speakers throughout the world in a level of detail that other Wikipedias don't have, so I have no choice but to lift it and turn it into English (except for when the Norwegian looks pretty much like English, like offisiell). The list is arranged by percentage as opposed to the actual number of speakers. Here it is:

Land	Status	Number of speakers	Percent
Germany	offisiell	074 530 000	90,00
Austria	offisiell	007 116 000	89,00
Liechtenstein	offisiell	000 030 000	86,00
Luxembourg (Standard German and lëtzebuergesch)	offisiell	000 340 000	72,00
Sveits	offisiell	004 762 000	64,00
Vatican (Swiss Guards)	regional	000 000 110	12,00
Israel (Yiddish)	—	000 215 000	03,10
Nederland	—	000 386 000	02,40
Kasakhstan	—	000 300 000	02,00
Namibia	regional	000 030 000	01,50
France (Elsace)	—	000 600 000	00,99
Paraguay	—	000 060 000	00,92
Argentina	—	000 300 000	00,78
Belgium (Eupen-Malmedy)	offisiell	000 078 000	00,75
Italia (South Tyrol)	regional	000 338 000	00,58
Russia	regional	000 800 000	00,56
Hungary	regional	000 050 000	00,50
Brasil	—	000 900 000	00,48
Kirgisistan	—	000 020 000	00,39
Czech Republic	—	000 040 000	00,39
Poland (Schlesien)	regional	000 153 000	00,38
Denmark (Nordslesvig)	regional	000 015 000	00,28
Canada (Hutterites)	—	000 045 000	00,14
USA (Amish and Yiddish)	—	000 410 000	00,14
Chile	—	000 020 000	00,12
Mexico	—	000 080 000	00,08
Ukraine	—	000 033 000	00,07
Romania (Siebenbürgen)	regional	000 014 000	00,06
Worldwide		120 000 000	01,80

Edit: Per request, I'm including Olivier's comment in the post since he's quite knowledgeable on the subject:

As an inhabitant of Lorraine I will protest against the omission of Lorraine among the French speakers of German (I am one, but not native; indeed even in the border region, native speakers are only old people). One week ago, I visited my grandmother at the hospital, and, while I was walking in the gangway, an old woman talked to me in (I think) Moselfrankisch and I desperately tried to answer in a mixture of Standard German and Luxembourgish (but the woman had obviously the Alzheimer disease). Secondly, the right orthography is "Alsace" (pronounced "Alzace") not "Elsace"...

Lastly, one can question if it is scientifically correct to include Germanic dialects (not to mention Yiddish) within the data for Standard German. As I've just mentioned, intercomprehension partly exists between all those languages, but it is not always assured (like what I experienced with the old woman though I'm a quite good speaker of Standard German)

I suppose that depends on one's definition of a language. If complete comprehensibility is the definition then I'm not sure you could say that a speaker from Texas (Boomhauer for an extreme example) and a guy from Ireland were really speaking the same language.

But if you think of a language as more of a common sphere of linguistic influence then I think you could include regional variants in the total. Though there may not be complete mutual comprehensibility people that use regional variants are still probably affected by more or less the same media - tv, radio, newspapers, etc. So as for whether you could take two people and sit them down to have a conversation the answer is probably no, but if you are considering a possible audience for a movie or tv show or newspaper, then the answer is probably yes. That would mean that the 120 million number above (plus Olivier's extra region and probably some others) would be the total number of people you could reach with something like an online article or blog post.