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The loudest cities in Connecticut, ranked by noise exposure
Among Connecticut's 5 cities of 100,000 or more residents, Stamford is the noisiest: 5.9% of its people live with average-day transportation noise of 60 dB or louder, ranking it #80 of 297 US cities. The typical Connecticut city in the list sits at 3.6%.
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| Connecticut # | City | US # | ≥60 dB | ≥70 dB | 45–60 dB | Population |
|---|---|---|---|---|---|---|
| 1 | Stamford | 80 | 5.9% | 1.6% | 41.7% | 130,057 |
| 2 | New Haven | 114 | 5.1% | 1.2% | 41.3% | 130,381 |
| 3 | Bridgeport | 217 | 3.6% | 0.9% | 32.8% | 145,014 |
| 4 | Hartford | 257 | 3% | 0.8% | 28.9% | 122,549 |
| 5 | Waterbury | 264 | 2.7% | 0.8% | 15.6% | 107,841 |
Across Connecticut, 5 cities of 100,000+ make the measured ranking — 635,842 people combined. In order of residents above 60 dB: Stamford (5.9%), New Haven (5.1%), Bridgeport (3.6%), Hartford (3%), Waterbury (2.7%), down to Waterbury at 2.7%. The midpoint sits at 3.6%, with 0 cities clearing 10%. Stamford leads the state for residents in the severe 70 dB+ band at 1.6%. Bridgeport, the biggest of the 5 with 145,014 residents, sits at 3.6% (national #217). Behind Stamford's headline 5.9%, 1.6% of its residents are in the severe 70 dB+ band and 41.7% in the moderate 45–60 dB range.
All of it is measured: the BTS 2020 noise map over ACS 2016–2020 population, aggregated to each city by the University of Washington, covering road, rail and aviation. Open any Connecticut city below for its full census-tract map, then measure your own street with the free live meter.
Which Connecticut cities are the noisiest?
By this federal data the noisiest Connecticut cities are the same as the loudest, since "noisiest" here means measured road, rail and aviation exposure: Stamford, New Haven, Bridgeport top the list, led by Stamford at 5.9%. The full ranking is in the table above.
Connecticut noise: the numbers
- 5 Connecticut cities of 100,000+ residents are in the ranking — 15th-most of any state.
- Loudest: Stamford at 5.9% of residents above 60 dB (national #80 of 297).
- Highest severe exposure: Stamford, 1.6% of residents above 70 dB.
- Median Connecticut city: 3.6% above 60 dB; 0 of 5 clear 10%.
- Combined population of the 5: 635,842 (ACS 2016–2020).
How this ranking is measured
These are the same federal measurements behind the national ranking of all 297 US cities — the BTS 2020 National Transportation Noise Map (road + rail + aviation) overlaid with Census ACS 2016–2020 population at census-tract level, with no estimation by us. Full methodology and the free CSV/JSON are on that page. It counts transportation noise only: sirens, construction and nightlife are outside the model.
How loud is your street?
Rankings describe city averages — your block is its own story. Check it with the free online decibel meter, or open any city above for its full census-tract noise map.