These are the steps I took to solve this problem:
1.) 319 million is 319,000,000 (6 zeros).
2.) 319,000,000 divided by 823,000 is 387.606318348. (I did this step to find how many "times larger")
3.) The U.S. is about 388 times larger than Columbus, Ohio.
I may have not gotten this right, but all the same, I hope this helps and have a good night! :D