Morsul makes a good point. Sauron was not at all concerned with Hobbits and, even if his spies had informed him of this peculiar race of 'little men', he would have had more pressing matters to deal with.
He may well have been aware of the vast green country because of its links to the Havens, but I can believe that Sauron only gauged from this that the Shire was north and west somewhat.
Remember that Sauron did not know what 'Shire' meant at all. It could have been anything from a huge kingdom to a single house.
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Los Ingobernables de Harlond
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