Jasee - 2010-03-10

What kind of coordinates are these latitude and longitudes compared to the zip code project?   We use them to show dealers in a radius, and I need to update them as we ran into someone with a 21409 zip, but I don't see it in any zip databases that are public.

21403 0.67979452118470107 -1.3349831811352757
21404 0.68029056121141041 -1.3351470500987455
21405 0.68126841683142525 -1.3359607400493176