What is the legal test for establishing a town's population is 1,000?

2 To a court sitting in a major urban center, a town of 1,000 persons may seem inconsequentially small. Recognizing that the populations of many Montana counties are less than even a small suburb in California, we are particularly wary of substituting our social and economic beliefs for those of the Montana legislature. See Ferguson v. Skrupa, 372 U.S. 726, 730, 83 S.Ct. 1028, 1031, 10 L.Ed.2d 93 (1963). While a population cut-off of 1,000 persons may no longer be wise, we leave that question to the state legislature.