Cool concept, but I've never heard of Kakamega? It's not larger than Mombasa. I also don't know if its by city-proper or metro population, you might want to clear that up :)
I love the idea, but the city populations you are using seem to be different from JetPunk standard. Also, the C in the two-word answer should be capitalized.
Is it meant to be by metro area or city proper? I mean, it doesn't matter so much, if you can guess the country, but in case of Finland it's the metro area (otherwise Espoo is second) and in case of South Korea it is city proper, because otherwise Incheon is part of Seoul metropolitan area.