Noise Levels in 20747, MD | Find Quiet Neighborhoods With Our Sound Map
53 dBA
Average noise across 20747
Quiet office to normal conversation
9,563
Residents above the EPA 55 dBA threshold
26% of 20747 residents
84 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across 20747 at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
Overall
Road
Rail
Aviation
Click the map to explore
35 dBa55 dBa (EPA limit)90+ dBa
3545557090
Quietest (dBA)Loudest
Colorblind friendlyoff
What the numbers sound like
30 dBAWhisper
40 dBASoft rainfall
45 dBAQuiet suburban street at night
50 dBAQuiet office
55 dBAEPA outdoor threshold: light traffic 100 ft away
60 dBANormal conversation an arm's length away
65 dBABusy restaurant
70 dBAHighway traffic 50 ft away
80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 9,563 20747 residents, or 26.4%, live above that level. By land area, 36.2% of 20747 is above 55 dBA.
Average noise levels for 20747 residents, grouped by direction from the center of 20747. Eastern 20747 carries the highest population-weighted average; Northern 20747 carries the lowest. Just 16% of residents in Northern 20747 live in blocks above the EPA's 55 dBA threshold, about two-thirds of the share in Eastern 20747.
Central 20747
54.3 dBA · Moderate-loud
Quiet office to normal conversation
53% of people above 55 dBA
QuietLoud
Eastern 20747
54.7 dBA · Moderate-loud
Quiet office to normal conversation
30% of people above 55 dBA
QuietLoud
Northern 20747
50.2 dBA · Moderate
Quiet office
16% of people above 55 dBA
QuietLoud
Southern 20747
52.3 dBA · Moderate
Quiet office to normal conversation
21% of people above 55 dBA
QuietLoud
Western 20747
54.0 dBA · Moderate-loud
Quiet office to normal conversation
33% of people above 55 dBA
QuietLoud
Eastern 20747 sounds about 37% louder than Northern 20747 to the human ear, a 4.5 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
How far back from I-95 do you need to be?
I-95 produces an estimated 79 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a soft rainfall.
At source
79 dBA
City bus interior
165 ft
64 dBA
Busy restaurant
330 ft
56 dBA
Quiet office to normal conversation
660 ft
47 dBA
Quiet office
¼ mile
39 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 31% of 20747 sits under tree canopy (about average for zip codes) and roughly 38% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.
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Airport Noise
Ronald Reagan Washington Ntl (DCA) sits west of 20747. The U.S. Department of Transportation measures aviation noise around this airport directly, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 45 dBA on the map's Overall layer. Blocks on the opposite side of 20747, particularly to the east, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across 20747
The bar chart below shows the share of 20747 residents in each noise band. About 71% of residents live below the EPA's 55 dBA threshold, and roughly 11% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 20747 Compares
20747 sits at the louder end of the spectrum. Below: how 20747's average outdoor noise and share of residents above the EPA threshold compare with 20743, 20748, 20785, and 20735.
Average noise level (dBA)
20747's 53.0 dBA pop-weighted average is at the louder end of the spectrum. Maryland as a whole averages 52.3 dBA and the U.S. averages 52.0 dBA. Both are lower than 20747 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 26.4% of 20747 residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 36.2% of 20747's footprint sits above 55 dBA, against a Maryland average of 32.9% and a national average of 28.1%.
What This Means if You're Moving to 20747
Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from I-95 and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
Tree canopy can help reduce modeled noise exposure. Roughly 31% of 20747 is under tree cover (about average for zip codes), and the dominant land cover is low-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
Airport noise is directional. Ronald Reagan Washington Ntl's approach paths concentrate aviation noise to the west. Neighborhoods to the east of downtown show no measurable contribution from the airport.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.
