Webster's Revised Unabridged Dictionary · 1913

Whereabout

Whereabout , adverb

1.
About where; near what or which place; -- used interrogatively and relatively; as, whereabouts did you meet him?

In this sense, whereabouts is the common form.

2.
Concerning which; about which.
The object whereabout they are conversant. — Hooker

Also: Whereabouts

Whereabout , noun

The place where a person or thing is; as, they did not know his whereabouts. — Shakespeare
A puzzling notice of thy whereabout. — Wordsworth

Also: Whereabouts