Who is the unnamed narrator in “A Rose for Emily”and for whom does he profess to be speaking?

The narrator in "A Rose for Emily" is definitely a
townsperson, or the townspeople
themselves. 

The narrator tells the story from the point of
view that the townspeople would have had when originally witnessing the events that are
told about.  Notice that nothing is mentioned that wouldn't have been seen or heard or
smelled by the townspeople. 

When Emily buys poison, we get
the details from the point of view of the pharmacist.  When the house smells, we get the
story from the point of view of the people that smelled the stink, and from the people
that put down the lime.  When town leaders go to Emily to collect taxes, we get the
version of the events from the point of view of the people that
went.  

Since townspeople never went upstairs to the
bedroom where the skeleton was kept, we don't get that detail until they finally do go
in the bedroom--after Emily's death.   

I don't know that
there is much disagreement about the narrator.  From what I've read, the only
disagreement that exists today is whether the narrator is a single person from the town,
or the collective voice of the town itself.