What is your whereabout or where is your whereabout?

Nor Priest.....Do you know where the suspect's whereabout is?
Do you know what the suspect's whereabout is?

As a noun, I'm familiar only with whereabouts.

Grammar GeekAs a noun, I'm familiar only with whereabouts.

"whereabouts" is probably more common, but 'whereabout' is also recognized.

http://www.merriam-webster.com/dictionary/whereabout

canadian45"whereabouts" is probably more commo

It's definitely more common. There are 1,510 COCA citations for 'whereabouts' and only three for 'whereabout'. I would advise my students not to use the latter form; it will be considered incorrect by many native speakers.

fivejedjonit will be considered incorrect by many native speakers.

Including this one. I’ve always heard the plural form.

Without overly disputing anyone else's comments, the OP used "whereabout" and the dictionary reference acknowleged it as well. So it is apparently also correct, albeit much less commom. Like the rest of you, I am much more familiar with "whereabouts". But strictly speaking, those who would consider "whereabout" wrong may have to reconsider.

All you above argued on an issue that wasn't even a part of the question. Is it "what" or "where" you use to address the "whereabouts" of an object?