References in periodicals archive ?
Some of the most popular territories that companies use are:US States, zip codes by State, counties by State, PUMA territories, and 3-digit zip codes.
Population by 3-digit zip codes (zip sectional centers) was selected as the elemental customer cluster.
This is accomplished by first mapping fee data for 3-digit ZIP Codes to counties and then aggregating the data for counties to the locality level.