data Georgia;
  set sashelp.zipcode(where=(StateName="Georgia"));
  if msa=0 then msa=.;
run;
ods output NLevels=CountsNLevels;
proc freq data=georgia nlevels;
  tables CountyNm AreaCode ZIP_Class MSA
 / noprint missing;
  label ZIP_Class=" " MSA=" " CountyNm=" " AreaCode=" ";
  title1 "Counts of Variable Levels";
run;
proc print data=CountsNLevels;
  title1 "Counts of Variable Levels";
run;