The smallest US capital is:
~Montpelier, Vermont~
According to Wiki, Barre, Vermont and Montpelier make up a small metro area.
The census 2004 population estimate for these two cities is about 17,500.
The smallest American capital is: (North America and South America)
~Belmopan, Belize~
Wiki population~about 7,000
Zinc, out.

That's all good and well for Belapan, but the largest city in Belize, imaginatively called Belize, will be added instead.

LOCKED & MOVED

T.