----------------------------Original message---------------------------- beg pardon if this has come over twice; been changing my e-mail address w/ concommitant loss of some mail last week. Does anyone out there have a zip(5 digit) code centroid file available? We have health survey data w/ respondents geocoded by zip code & surrogate exposure data on hazardous releases & toxics geocoded by lat/long of the monitoring stations. Need to match the 2 sets up in a not too implausible fashion. yours appreciatively, bob mcconnaughey [log in to unmask]