Port Royal, SC Noise Levels
Port Royal, SC: what the federal noise map shows
At Port Royal, SC, road, rail and aircraft noise all fall below the 45 dB(A) floor BTS's national map can distinguish from silence. That figure is sampled at one coordinate, the Census Bureau's own internal point for Port Royal, not a street-by-street survey of the whole place.
Where Port Royal ranks
There's no loudness rank for Port Royal: it's one of 8,515 places nationally where BTS's model measures nothing above its 45 dB(A) floor. By population, it ranks 2,248 of the 12,137 places in this dataset, home to about 16,507 people.
Your street may differ from Port Royal's reading
For a single house or lot in Port Royal rather than the town-wide figure above, BTS's own map is the same free source, queried directly.
More on how this number was built
For exactly which federal dataset feeds Port Royal's figure, see the methodology guide. The guide to reading a quiet result explains what "no measurable noise" actually means at Port Royal.