How many US states have names which are only four letters long?

Of the 50 U.S. states, only three have four letters: Those states are Iowa, Ohio and Utah.

The United States of America, commonly known as the United States (US or U.S.) or America, is a country primarily located in North America. The third-largest country in the world by land and total area, the U.S. consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands and includes 326 Indian reservations. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with several other countries.

Iowa is a state in the upper Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the east and southeast, Missouri to the south, Nebraska to the west, South Dakota to the northwest, and Minnesota to the north.

Ohio is a state in the Midwestern United States. Of the 50 U.S. states, it is the 34th-largest by area. With a population of nearly 11.8 million, Ohio is the seventh-most populous and tenth-most densely populated state. Its capital and largest city is Columbus.

Utah is a landlocked state in the Mountain West subregion of the Western United States. It is bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to its west by Nevada.