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| 1990 COUNTY ACCESSIBILITY. This map shows the population accessibility scores for counties across the country in 1990. The darker the shading, the more accessible the county to the rest of the nation’s population. The map reveals very broad regional trends of accessibility, with the highest areas concentrated in the Northeast and Midwest. [This map courtesy of the Journal of Geographical Systems, (2003) 5:5-23] |
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| 2000 COUNTY ACCESSIBILITY. This map shows the population accessibility scores for counties across the country in 2000. The darker the shading, the more accessible the county to the rest of the nation’s population. In 2000, compared to 1990, note that the leading edge of top-tier accessibility has extended southward to include significant portions of North Carolina and Tennessee. [This map courtesy of the Journal of Geographical Systems, (2003) 5:5-23] |