Assume Texas is perfectly flat and featureless...
Texas (square miles) 261,797
Square mile in square feet 27,878,400
Texas (square feet) 7,298,481,484,800
Approximate population, H. sapiens (Planet Earth only) 7,000,000,000
Square feet of Texas per individual H. sapiens, divided equally 1,043
Exact measurement of each side of square territory 32.2899397973159
Since your least precise figure, population, has approx. one digit of accuracy, then your result should be expressed as “30 feet by 30 feet”.