Sentence analysis

The police questioned every person who lived in the neighbourhood.

The police questioned every person = coordinate clause.
'questioned' here is finite verb.
'The police' =  subject
'every person'  = object, and noun phrase
'every' = adjective (noun qualifier)
'who lived in the neighbourhood' = subordinate clause
'who' = relative pronoun
'lived' = finite verb,
'in the neighbourhood' =  prepositional phrase
'the neighbourhood' = noun phrase
'neighbourhood' = noun,
How do we call the sentence element that answers the question: where?

My second question is: Do you agree with my statements?

This is the definition of a coordinate clause. Does it fit with your example above?

Definition
	A coordinate clause is a clause belonging to a series of two or more clauses which
	are not syntactically dependent one on another, and are joined by means of a coordinating conjunction a connective, or parataxis.

Examples (English)
	I will go home and he will go to work. John likes hamburgers, but Mary prefers hot dogs. We might go to Seattle, or we might go to California. [link]