Which country's capital is closest to the Equator?

Quito, Ecuador is closest to the equator (0º14'S / 78º30'W) closely followed by Kampala, Uganda (0º19'N / 32º35'E), São Tomé (0º20'N / 6º44'E) and Libreville, Gabon (0º30'N / 9º25'E).

http://wiki.answers.com/Q/What_is_the_closest_capital_to_the_Equator

(I'm generally suspicious of wiki.answers, but these figures all neatly in one place agree with checks in the CIA Factbooks for the countries which seem to have the equator running through them.)

http://geography.about.com/od/physicalgeography/a/equatorialctys.htm

Libreville in africa

Bangui, being in the south of the country and thus closest to the equator, is slightly hotter and wetter than the northern parts of the country.
https://en.wikipedia.org/wiki/Bangui#Climate