number of errors=0
number of warnings=0
country=US
Group=chkGrpPostalCode
select distinct admincode1,admincode2,adminname2 from zip_code where countrycode in ('US') and admincode1 || admincode2 in (select admincode1 || admincode2 from (select distinct admincode1,admincode2,adminname2 from zip_code where countrycode in ('US')) t group by admincode1,admincode2 having count(*)>1) order by admincode1,admincode2
https://tools.usps.com/go/ZipLookupAction!input.action
admincode1 admincode2 adminname2