Geocode the data, and then print the output data set.

proc geocode method=ZIP                          /* Geocoding method        */
             data=customers                      /* Address data            */
             out=geocoded_customers              /* Output data set         */
             attributevar=(statename, countynm); /* Include these variables */
run;

proc print data=geocoded_customers noobs;
  var x y _matched_ statename countynm address zip;
run;