Re^3: Rotating IP Addresses for Scraping

This sounds rather an XY problem to me. What you actually seem to want are travel distances between various pairs of locations unrelated to zip codes (I doubt in the 1850s zip codes were much in vogue) and actually unrelated (directly) to lat/long values. Calculating a distance between two points doesn't actually provide a very good indicator of the travel distance or travel difficulty between the two points, but is at best an approximate proxy for the data you really want. Using zip codes to specify locations is just another layer of inexact proxies.

Maybe there are better ways of determining the information you actually want than "stealing" data to provide and approximation of and approximation to the data you really want?

True laziness is hard work

Comment on Re^3: Rotating IP Addresses for Scraping

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Re^4: Rotating IP Addresses for Scraping by hominid (Priest) on May 19, 2011 at 20:38 UTC
Agreed. The United States Postal Service began using zip codes in 1963. In densely populated regions, a zip code's area may be less than a square mile. In sparsely populated regions, a zip code's area may be several hundred square miles (check out West Texas, for example).	[reply]