The 50 states that make up the United States have drastically different sizes. The largest state, Alaska, for example is about 425 times bigger than the smallest, Rhode Island. The three largest states, Alaska, Texas and California make up about 30% of the entire country!
It is also interesting to note that due to sea erosion, the states along the coasts are slowly shrinking in size with one exception – Hawaii. Due to volcanic activity, Hawaii is actually increasing in size; Kilauea Volcano has been erupting since 1983 and has added almost one square mile of new land to the state since then.
The above from the Wise Geek, which has an interesting chart.