Even though Arizona and Rhode Island are both states of the U.S., they are strikingly different in many ways. For example, the physical size of each state is different. Arizona is large, having an area of 114,000 square miles, whereas Rhode Island is only about a tenth the size, having an area of only 1,214 square miles. Another difference is in the size of the population of each state. Arizona has about four million people living in it, but Rhode Island has less than one million.