Pierre, South Dakota, is the 2nd least populous state capital in the United States. It has a population of about 14,000.
Wyoming.
Montpelier, Vermont is the least populous U.S. state capital. It is home to an estimated 7,700 people.
Wyoming, 532,668 Vermont, 621,270 North Dakota, 641,481 Alaska, 686,293
Wyoming (pop. 532,000)