Question: how to calculate distance between zip codes in sas?
Answer: Dist = 3949.99 * arcos(sin(lat1) * sin(lat2) + cos(lat1) * cos(lat2) * cos(long1 - long2)); ... 
long = atan(1)/45 * longdeg; lat = atan(1)/45 * latdeg; ... 
VALUE = (degrees) + (minutes/60) + (seconds/3600); ... 
proc cimport file="directory\zipcode.