Hi,
I'm not sure if I understean the question very well, but:
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two pushpins located in the same place on my map but in reality, the businesses are about 1/2 mile apar
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How many decimals do you have ? If not enough you can easy get a resolution of 1/2 mile. 1 minute is exact 1 sea mile on latitude and on longitude on equator.
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numerical street address and not just by the name of the street
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If the street contains no number (which is sometimes), then the only method to check this (as far as I know), is to parse the returned streetaddress and check if there is a number in it.