1 | a large central city (over 250,000) |
2 | a medium size central city (50,000 to 250,000) |
3 | a suburb of a large central city |
4 | a suburb of a medium size central city |
5 | an unincorporated area of a large central city (division, township, etc.) |
6 | an unincorporated area of a medium central city |
7 | not within an smsa, (within a county) and a small city (10,000 to 49,999) |
8 | a town or village (2,500 to 9,999) |
9 | an incorporated area less than 2,500 or an unincorporated area of 1,000 to 2,499 |
10 | open country within larger civil divisions (division, township, etc.) |