Key West (EYW) in the continental united states.
The A.P. Hill Army Airfield is located in Virginia. Another Army airfield is Allen Army Airfield and it is located in Alaska.
Naaelehu, Hawaii is the southernmost town in the US. Honolulu, Hawaii is the southernmost incorporated city in the US.
Hawaii.
FLORIDA!
Honolulu
Yes it is.
Florida.
nothing
It is Hawaii.
If the question actually means the 48 contiguous US States then it is Florida. Na'alehu Hawaii is the southernmost town in the US and Hawaii is the southernmost US State.
Key West, Florida for the contiguous States and the Big Island of Hawaii for the US States.
Country? ...or did you mean state?