What is the square miles is the US?

Answer 1

The 50 states and District of Columbia have land area of 3,531,905 square miles and total area including water of 3,796,742 square miles. The contiguous U.S. has land area of 2,954,841 square miles and total area including water of 3,120,426 square miles.

Answer 2

Approx 3.8 million square miles.