Pronunciation of "on" in United States

around Coastal North Carolina I have heard /o:Un/ and even /or\n/.

Not being a native, I say /A:n/

Since the original ''long, song, wrong'' topic is closed I am placing the link here:

http://youtube.com/watch?v=c_Z6Qg5XErA

''song pronounced as [sɑ:ŋ]''
from the Academy Awards 2008,
sorry the original video is not available due to copyright issues.