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

In reply to Re^3: Rotating IP Addresses for Scraping by GrandFather
in thread Rotating IP Addresses for Scraping by jandrewc

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