Your off on your calculation here is the correct figure:
1 045 square mile [survey, U.S. statute] = 29 133 044 865.916 12 square foot
Huh, you're right. I listed the square feet in 1 square mile.
Using the correct value yields 4.9 square feet, or 2.2ft X 2.2ft per person.
That would probably work, but I'd sure hate to be in charge of the port-a-potties.