I have no idea of what is unique on your data but this is a start 
Select a.Company, a.Contact, a.CustomerNumber, a.State, a.City From
Table a
join
(
select CustomerNumber, State
from TableA
group by CustomerNumber, State
having Count(*) >2 ) SubQ
on SubQ.CustomerNumber = a.CustomerNumber and SubQ.state = a.state
hth