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The urban area relationship files are nation-based, comma-delimited ASCII files and include all 50 states, the District of Columbia, Puerto Rico, and the Island Areas.
These files represent the full extent of both the urban areas and the related geography. They contain separate records for (a) the territory of intersection between the urban areas and the related geographic entities, (b) the territory within the urban areas but outside the related geographic entities, and (c) the territory outside any urban area but within the related geographic entities.
For example, consider the hypothetical situation where the Fairview urbanized area may overlap part of Pine Grove incorporated place. The urban area to place relationship file will include a record that contains the population, housing count, land area, and total area for the territory of overlap between Fairview and Pine Grove; a record that contains the population, housing count, land area, and total area for the territory within Fairview but outside Pine Grove (if it exists); and a record that contains the population, housing count, land area, and total area for the territory outside Fairview but within Pine Grove (if it exists).
In addition to the population, housing count, land area, and total area for the parts of an urban area and a related geographic entity, each record also includes population, housing count, land area, and total area for the whole urban area and related entity and the percent population, housing count, land area, and total area that the parts represent of the whole.