Portland, TN Noise Levels
How loud is Portland, TN?
None of the three transportation sources BTS models, road, rail or aircraft, register above 45 dB(A) at Portland, TN.
That's the reading at Portland's Census-defined center point, not any one street, BTS's map is a live raster, not a per-address service.
How Portland compares nationally
There's no loudness rank for Portland: it's one of 8,515 places nationally where BTS's model measures nothing above its 45 dB(A) floor. By population, it ranks 2,567 of the 12,137 places in this dataset, home to about 13,651 people.
Checking one address in Portland
Nothing here substitutes for checking one address in Portland directly, and BTS's own map lets anyone do that at no cost.
Portland's number isn't a one-off calculation, it comes from the same method covered in the methodology guide. See the why New York City shows up quiet here too for why a real place can show no reading at all.