In the case of the maximum of nine subdivisions, the
following assignments would be used in the first digit:
1 = Northwest 1/9
2 = North Central 1/9
3 = Northeast 1/9
4 = West Central 1/9
5 = Central 1/9
6 = East Central 1/9
7 = Southwest 1/9
8 = South Central 1/9
9 = Southeast 1/9
