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. 2007 Aug 31;7:228. doi: 10.1186/1471-2458-7-228

Table 1.

Detailed list of rural urban commuting areas codes

1 Metropolitan area core: primary flow within an Urbanized Area (UA)
 1.0 No additional code
 1.1 Secondary flow 30% through 49% to a larger UA
2 Metropolitan area high commuting: primary flow 30% or more to a UA
 2.0 No additional code
 2.1 Secondary flow 30% through 49% to a larger UA
3 Metropolitan area low commuting: primary flow 10% through 29% to a UA
 3.0 No additional code
4 Large rural area core: primary flow within an Urban Cluster (UC) of 10,000 through 49,999 (large UC)
 4.0 No additional code
 4.1 Secondary flow 30% through 49% to a UA
 4.2 Secondary flow 10% through 29% to a UA
5 Large rural high commuting: primary flow 30% or more to a large UC
 5.0 No additional code
 5.1 Secondary flow 30% through 49% to a UA
 5.2 Secondary flow 10% through 29% to a UA
6 Large rural low commuting: primary flow 10% through 29% to a large UC
 6.0 No additional code
 6.1 Secondary flow 10% through 29% to a UA
7 Small rural town core: primary flow within an Urban Cluster (UC) of 2,500 through 9,999 (small UC)
 7.0 No additional code
 7.1 Secondary flow 30% through 49% to a UA
 7.2 Secondary flow 30% through 49% to a large UC
 7.3 Secondary flow 10% through 29% to a UA
 7.4 Secondary flow 10% through 29% to a large UC
8 Small rural town high commuting: primary flow 30% or more to a small UC
 8.0 No additional code
 8.1 Secondary flow 30% through 49% to a UA
 8.2 Secondary flow 30% through 49% to a large UC
 8.3 Secondary flow 10% through 29% to a UA
 8.4 Secondary flow 10% through 29% to a large UC
9 Small rural town low commuting: primary flow 10% through 29% to a small UC
 9.0 No additional code
 9.1 Secondary flow 10% through 29% to a UA
 9.2 Secondary flow 10% through 29% to a large UC
10 Isolated small rural areas: primary flow to a tract outside a UA or UC (including self)
 10.0 No additional code
 10.1 Secondary flow 30% through 49% to a UA
 10.2 Secondary flow 30% through 49% to a large UC
 10.3 Secondary flow 30% through 49% to a small UC
 10.4 Secondary flow 10% through 29% to a UA
 10.5 Secondary flow 10% through 29% to a large UC
 10.6 Secondary flow 10% through 29% to a small UC