How many people from each country were killed in the Holocaust?
Have a look at the link for country by country lists of the figures. You really need to look at the whole page, as the borders of many countries changed during World War 2.
The lists go by country of deportation, in order to avoid double counting. So, for example, people who fled from Germany to France before the start of World War 2, but were later sent from France to Auschwitz, are included in the total for France only. Obviously, especially in Poland and the former Soviet Union. many victims were killed in mass open-air shootings - in which case the question of deportation doesn't arise, only the country of death.
This gives the categories of people, but is not a country by country list.
According to Wikipedia (search "holocaust), the toll was as follows:
- Jews - 5.9 million
- Soviet POWs - 2-3 million
- Ethnic Poles - 1.8-2 million
- Romani - 220,000-1.5 million
- Yugoslavs - 581,000
- East Slavs [Russians, Ukrainians, Belarussians] - 1,670,000
- Disabled - 200,000-250,000
- Homosexuals - 5,000 to 15,000
- Jehovah's Witnesses - 2,500 to 5,000
The conservative estimate of 5,933,900 lives lost to the final solution is well listed in the Holocaust section of the Jewish Virtual Library. Estonia, Latvia, Lithuania and Poland lost 90 percent of their Jewish population or about 3,228,000 people. --- The link provides a country-by-country breakdown.