The Collaborative International Dictionary of English v.0.48:

Whereabout \Where"a*bout`\, Whereabouts \Where"a*bouts`\, n.
   The place where a person or thing is; as, they did not know
   his whereabouts. --Shak.
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         A puzzling notice of thy whereabout.     --Wordsworth.
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The Collaborative International Dictionary of English v.0.48:

Whereabout \Where"a*bout`\, Whereabouts \Where"a*bouts`\, adv.
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   1. About where; near what or which place; -- used
      interrogatively and relatively; as, whereabouts did you
      meet him?
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   Note: In this sense, whereabouts is the common form.
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   2. Concerning which; about which. "The object whereabout they
      are conversant." --Hooker.
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      [1913 Webster] Whereabout