Not a comprehensive list, just some random observations, courtesy mostly of the CIA World Factbook:
- South Africa is obviously the highest with a white population of 9.6% of their total population. South Africa is also 2.5% Asian/South Asian. I didn't tally all of the countries, but it seems likely that there are more white South Africans than white Africans from the rest of the continent combined.
- Botswana is 7% white. I don't think I've ever met anyone from Botswana, white or black. There are only 2 million Botswanans.
- There are a ton of Lebanese in the Cote d'Ivoire -- 130,000 as of 1998. 14,000 French as well. The total percentage of "Other" is 2.8% according to the Factbook.
- Angola is 1% European and 2% mixed European and African.
- Somewhat surprisingly (for those who have seen Nowhere in Africa), Europeans and Asians combine to make up only 1% of Kenya's population.
- Former Rhodesia: Zimbabwe is now less than 1% white, down from 5.4% of the population (270,000 people) in the 1970s. Only 0.5% of Zambians are white or Asian.
- Tanzania is 1% European, Asian and Arab combined.
- Senegal is 1% European and Lebanese combined.
- No info from CIA Factbook on Nigeria. Wiki Answers says that there are 50,000 white people, which comes out to only 0.0003% of the population. 50,000 is still a pretty significant number though compared to most of these countries.
- I couldn't find a good number for Ghana. CIA Factbook says that 1.6% of their population is "Other."