FAQ What’s the difference between Records in a Radius and ZIPs in a Radius? Records in a Radius tells you how many records in your mailing list are located within a given range from a central Zip Code. It can also append the distance from the central Zip Code to each of the records in your list. Using a given Zip Code as a center point, Zips in a Radius will report all the Zip Codes located within a user-defined radius. Zips in a Radius will return Zip Codes, Distance (in miles), City, State and County. You do not have to have a list open in MAILERS+4 to access the ZIPs in a Radius function.