data Georgia;
  set sashelp.zipcode(where=(StateName="Georgia"));
  if msa=0 then msa=.;
run;
proc freq data=georgia;
  tables CountyNm / out=Counties noprint;
  tables AreaCode / out=AreaCodes noprint;
  tables ZIP_Class / out=ZIPclasses noprint;
  tables MSA / out=MSAs noprint;
run;
data counts;
  set Counties(in=county_level)
      AreaCodes(in=areacode_level)
      ZIPclasses(in=zipclass_level)
      MSAs(in=msa_level)
        end=no_more;
  if county_level then CountyCount+1;
  else if areacode_level then AreaCodeCount+1;
  else if zipclass_level then ZIPclassCount+1;
  else if msa_level then MSACount+1;
  if no_more then output;
  keep CountyCount AreaCodeCount ZIPclassCount MSACount;
run;
proc print data=counts noobs;
  title1 "Counts of Variable Levels";
run;