Table 1. Percent Distribution of Medicare Population, by Human Resource Profile Code (HRPC): 1987.

HRPC Code	Percent Distribution
Total	100.00
Metropolitan Counties
Large Core:
Central counties of metropolitan statistical areas (MSAs) with populations of 1 million or more	26.64
Large Fringe:
Fringe counties of MSAs with populations of 1 million or more	15.03
Medium:
Counties in MSAs with populations of 250,000 to 1 million	21.83
Small:
Counties in MSAs with populations of fewer than 250,000	9.17
Non-Metropolitan Counties
Urban Adjacent:
Non-metropolitan counties with an urban population of 20,000 or more, adjacent to an MSA	5.22
Urban Non-Adjacent:
Non-metropolitan counties with urban population of 20,000 or more, not adjacent to an MSA	3.62
Less Urban Adjacent:
Non-metropolitan counties with an urban population of fewer than 20,000, adjacent to an MSA	7.52
Less Urban Non-Adjacent:
Non-metropolitan counties with an urban population of fewer than 20,000, not adjacent to an MSA	7.82
Thinly Populated Adjacent:
Completely rural counties, adjacent to an MSA	1.21
Thinly Populated Non-Adjacent:
Completely rural counties, not adjacent to an MSA	2.21

NOTE: Metropolitan areas were defined as of 1983, using 1980 census data, and adjacency requires that a rural county share a boundary with an MSA and that at least 2 percent of its employed labor force commute to the MSA.

SOURCE: Health Care Financing Administration, Bureau of Data Management and Strategy: Data from the 1987 Health Insurance Skeleton Write-Off files.