Armstrong is an unincorporated community in St. Johns County, Florida, United States, located off State Road 207.
Armstrong is located at 29°45′43″N 81°26′53″W / 29.7619°N 81.4481°W / 29.7619; -81.4481Coordinates: 29°45′43″N 81°26′53″W / 29.7619°N 81.4481°W / 29.7619; -81.4481.