16. A method for labeling cities on a digital map, the method comprising: determining, by a computer, a priority score for each of a plurality of cities, the priority score determined according to a frequency with which the city appears in a corpus of documents; categorizing each city, by the computer, according to its determined priority score; and rendering, by the computer, a digital map including at least some of the cities, each included city having a label with an appearance determined at least in part by the category to which the city belongs.
16. A method for labeling cities on a digital map, the method comprising: determining, by a computer, a priority score for each of a plurality of cities, the priority score determined according to a frequency with which the city appears in a corpus of documents; categorizing each city, by the computer, according to its determined priority score; and rendering, by the computer, a digital map including at least some of the cities, each included city having a label with an appearance determined at least in part by the category to which the city belongs. 20. The method of claim 16 wherein the documents in the corpus are customer records, each customer record including a city in which the customer is located.