Tainan-台南

Actually, two of those are not national capitals. Geneva and Belfast are both not national capitals.

there are 58 state capitals.

50 states, 1 national, & 7 territorial capitals.

50

Counting "national" capitals only, there are around 247. The UN has 193 member nations, but there are many nations that are not unrecognized, or only partly recognized internationally, and some countries have more than one capital.

For a list of national capitals, see the related link below.