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Traffic heat map of Nantucket County, Massachusetts: 39 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Orange Street

Nantucket County, Massachusetts Traffic Counts

Traffic analytics for Nantucket County, Massachusetts, calculated from real-world mobile and sensor networks on 1,163 road segments (39 road miles, about 176 ft each). Its drivers come from the highest-income neighborhoods of any county in Massachusetts, averaging $141,056. Use the figures below to move from assumptions to certainty on retail locations, logistics and road planning.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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Total Traffic Volume & Performance in Nantucket County, Massachusetts

Traffic

The average number of vehicles that travel each day over any road in the road network.

vehicles per day5,335
Trucks

The percentage of the total traffic volume composed of heavy vehicles.

6.0%
Average travel time

The average time of travel averaged among all vehicles traveling on the road network.

29.3 min
Congestion ratio

The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network.

18.2%
Drivers’ average age

Average age of residents in the geographic areas where the vehicle trips originated.

46.3 yrs
Drivers’ average income

Average income of residents in the geographic areas where the vehicle trips originated.

$141,056

Our data shows 5,335 vehicles per day on the average road in Nantucket County, Massachusetts, and 186,083 vehicle-miles traveled per day (≈67.9 million per year) across its 39 miles of monitored roads. Trucks are 6.0% of traffic, close to the 6.9% across Massachusetts.

Shorter trips than 92% of counties in Massachusetts

At 5,335 vehicles per day, the average monitored road in Nantucket carries 35% less traffic than the state average of 8,166, suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. In total volume terms, its road network carries about 0.1% of Massachusetts's statewide total of vehicle-miles. By volume, Nantucket's 5,335 vehicles per day trails 69% of counties in Massachusetts.

Journey times run 15% lower than the state level, at 29.3 minutes on average. On travel time, Nantucket runs shorter than 92% of counties in Massachusetts.

Congestion runs 24% lower than the state level, at a ratio of 18.2%, which means smoother traffic flow - relevant for traffic control and delivery planning.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Nantucket County, Massachusetts, the peak hour concentrates about 8% of the day's traffic.

Nantucket County vs. Massachusetts Traffic Comparison

Nantucket County's biggest difference from the Massachusetts average is its average daily traffic per road, 35% below it.

MetricNantucket CountyMassachusetts averageDifference
Traffic5,3358,166-34.7%
Truck % (Total Traffic)6.0%6.9%-14.1%
Avg. Travel Time29.3 min34.4 min-14.6%

How Nantucket County compares

Nantucket County moves the least traffic of its nearby counties

Compared with its 4 closest neighbours, Nantucket County moves 3.9% of the total daily travel; it has the third busiest roads of the five. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Nantucket County and the 4 nearest county-level areas by centroid distance, with the Massachusetts average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Nantucket County5,3356.0%186,08329.3 min18.2%
Dukes County, Massachusetts4,8994.6%343,75428.7 min15.7%
Barnstable County, Massachusetts6,1365.2%5,934,94032.1 min18.6%
Plymouth County, Massachusetts7,8046.0%11,686,20332.7 min21.8%
Newport County, Rhode Island4,8266.4%1,178,04031.2 min14.9%
Massachusetts average8,1666.9%N/A34.4 min24.0%

Nantucket County ranked within Massachusetts

No other county-level area in Massachusetts records a higher average driver income than Nantucket County.

Nantucket County ranked among 14 county-level areas in Massachusetts (1 = highest).
MeasureNantucket CountyMassachusetts rank
Traffic volume (AADT)5,335#10 of 14
Average travel time29.3 min#13 of 14
Average driver income$141,056#1 of 14
Average driver age46.3 yrs#11 of 14

The two ends of this table sit far apart: #1 of 14 on average driver income, against #13 of 14 on average travel time.

Busiest roads in Nantucket County, Massachusetts

Traffic concentrates on a few corridors: the three busiest roads average 11,256 vehicles a day, against 5,335 on the average road in Nantucket County.

Orange Street is the busiest road, at 12,090 vehicles a day, 571 of them trucks (4.7%). Old South Road is practically level with it at 11,941. Old South Road carries the most trucks, 828 a day (6.9% of its traffic), although it ranks #2 for all traffic.

Trips using Pleasant Street are long: a median of 44.7 minutes against 29.3 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Orange StreetSecondary road · 12,090vehicles571trucks · 4.7%
Road class
Secondary road
Congestion ratio
39.8%
Median trip time
23.7 min
Drivers’ median age
46.3 yrs
Drivers’ average income
$137,796

Travel on Orange Street's busiest stretch runs 40% over free-flow time, against 18% across the county, so expect slower peak hours.

2Old South RoadSecondary road · 11,941vehicles828trucks · 6.9%
Road class
Secondary road
Congestion ratio
34.8%
Median trip time
37.0 min
Drivers’ median age
46.2 yrs
Drivers’ average income
$135,469

Old South Road is one of the more congested roads here: trips take 35% longer than at free-flow speed, against 18% county-wide.

3Prospect StreetTertiary road · 9,739vehicles425trucks · 4.4%
Road class
Tertiary road
Congestion ratio
34.4%
Median trip time
19.7 min
Drivers’ median age
46.3 yrs
Drivers’ average income
$139,080

Prospect Street is a local road at heart: the median trip using it lasts 19.7 minutes, against 29.3 for the county.

4Sparks AvenueSecondary road · 9,180vehicles493trucks · 5.4%
Road class
Secondary road
Congestion ratio
31.8%
Median trip time
29.5 min
Drivers’ median age
46.3 yrs
Drivers’ average income
$137,667

Sparks Avenue is busy by local standards, at 72% more than the county average on its busiest stretch; trucks are 5.4% of it, below the county-wide 6.0%.

5Surfside RoadSecondary road · 8,721vehicles538trucks · 6.2%
Road class
Secondary road
Congestion ratio
28.4%
Median trip time
34.7 min
Drivers’ median age
48.1 yrs
Drivers’ average income
$131,685

Surfside Road peaks at 8,721 vehicles a day, 63% more than the county average; trucks are 6.2% of it, in line with the county-wide 6.0%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Old South RoadSecondary road · #2 by traffic11,941vehicles828trucks · 6.9%
2Pleasant StreetTertiary road · 7,926vehicles706trucks · 8.9%
Road class
Tertiary road
Congestion ratio
25.3%
Median trip time
44.7 min
Drivers’ median age
47.4 yrs
Drivers’ average income
$123,743

Pleasant Street carries 49% more than the county average at its busiest, 706 of them trucks (8.9%, above the county-wide 6.0%).

3Orange StreetSecondary road · #1 by traffic12,090vehicles571trucks · 4.7%
4Surfside RoadSecondary road · #5 by traffic8,721vehicles538trucks · 6.2%
5Sparks AvenueSecondary road · #4 by traffic9,180vehicles493trucks · 5.4%
How to read these road counts
  • The first number is AADT, annual average daily traffic: the vehicles passing a point on an average day, both directions combined and trucks included. On a divided highway both carriageways are added together.
  • Traffic changes along a road, with more near interchanges and towns and less in open country. Every figure for a road describes its busiest stretch in the county, so the two rankings show the same numbers for the same road.
  • The second number is the trucks on that stretch, a part of its AADT. The bar splits the AADT into cars and light vehicles (blue) and trucks (amber).
  • See segment-level AADT for any road on TrafficZoom.

Data Sources & Methodology

The data presented on this page is derived from TrafficZoom's proprietary analytics platform, which aggregates and normalizes information from multiple sources, including:

Mobile device location data (anonymized and aggregated)

Road sensor networks and traffic counters

Historical traffic pattern databases

Public traffic count programs published by the

NantucketDepartment of Transportation

Demographic Baseline for O-D Modeling

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
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Data current as of:
Q3 2026

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Counties near Nantucket County

The same traffic breakdown for the areas closest to Nantucket County, Massachusetts.

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