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Traffic heat map of Island County, Washington: 283 miles of roads shaded from blue (light) to red (heavy traffic), busiest on State Route 532 and State Route 20

Island County, Washington Traffic Counts

Its busiest road, State Route 532, carries 21,273 vehicles a day, 6.0 times the average road. This page breaks down traffic in Island County, Washington across 283 miles of monitored roads split into 6,742 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Island County, Washington

Traffic

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

vehicles per day3,573
Trucks

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

5.4%
Average travel time

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

33.9 min
Congestion ratio

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

15.2%
Drivers’ average age

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

47.5 yrs
Drivers’ average income

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

$84,419

Our data shows 3,573 vehicles per day on the average road in Island County, Washington, and 1,028,965 vehicle-miles traveled per day (≈376 million per year) across its 283 miles of monitored roads. About 1 in 18 vehicles is a truck, fewer than the 1 in 14 across Washington.

Traffic 51% below the Washington average

Island sees 51% lower average daily traffic volume than the state average (3,573 vehicles per day against 7,322), suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.7% of Washington's statewide total. By volume, Island's 3,573 vehicles per day outpaces 53% of counties in Washington.

Journey times here (33.9 minutes on average) closely track the state level. Its average travel time of 33.9 minutes is longer than 61% of counties in Washington.

At 23% lower than the state level, the 15.2% congestion ratio signals smoother traffic flow - relevant for traffic control and delivery planning.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 2:00 PM–5:00 PM, with volumes reaching approximately 95% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 20% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +12% versus the annual average.
Lowest month:
January is the quietest month, with volumes -13% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Island County, Washington, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +12% in high season.

Island County vs. Washington Traffic Comparison

The average daily traffic per road sets Island County apart: 51% below the Washington average. Its truck share is also 24% below.

MetricIsland CountyWashington averageDifference
Traffic3,5737,322-51.2%
Truck % (Total Traffic)5.4%7.1%-23.6%
Avg. Travel Time33.9 min33.2 min+2.3%

How Island County compares

Island County against nearby counties

Compared with its 4 closest neighbours, Island County moves 16.9% of the total daily travel; it has the fourth busiest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Island County and the 4 nearest county-level areas by centroid distance, with the Washington average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Island County3,5735.4%1,028,96533.9 min15.2%
Kitsap County, Washington5,6805.6%4,727,59131.5 min15.7%
Snohomish County, Washington8,2145.7%15,764,19832.2 min21.0%
Skagit County, Washington5,3077.6%3,814,19331.9 min17.0%
San Juan County, Washington7976.3%74,15134.4 minN/A
Washington average7,3227.1%N/A33.2 min19.9%

Island County ranked within Washington

Island County sits close to the Washington median on every measure below - no single figure sets it apart from the state as a whole.

Island County ranked among 39 county-level areas in Washington (1 = highest).
MeasureIsland CountyWashington rank
Traffic volume (AADT)3,573#19 of 39
Average travel time33.9 min#16 of 39
Average driver income$84,419#14 of 39
Average driver age47.5 yrs#19 of 39

Busiest roads in Island County, Washington

On their busiest stretches, the three busiest roads in Island County carry 18,417 vehicles a day on average, 5.2 times the typical road in the county (3,573).

State Route 532 leads with 21,273 vehicles a day, 1,220 of them trucks (5.7%). It tops the truck ranking too, with the most trucks.

Drivers on State Route 525 are noticeably older, with a median age of 60.1 against 47.5 across the county.

Northeast Regatta Drive carries longer journeys than most roads here, with a median trip of 48.3 minutes against 33.9 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1State Route 532Primary road · 21,273vehicles1,220trucks · 5.7%
Road class
Primary road
Congestion ratio
47.6%
Median trip time
29.6 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$101,914

State Route 532 is one of the more congested roads here: trips take 48% longer than at free-flow speed, against 15% county-wide.

2State Route 20Primary road · 18,952vehicles1,006trucks · 5.3%
Road class
Primary road
Congestion ratio
40.6%
Median trip time
35.5 min
Drivers’ median age
46.3 yrs
Drivers’ average income
$78,976

Delays build on State Route 20: its congestion ratio of 41% over free-flow time is well above the county's 15%.

3East Camano DriveSecondary road · 15,025vehicles724trucks · 4.8%
Road class
Secondary road
Congestion ratio
37.2%
Median trip time
28.1 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$97,452

East Camano Drive peaks at 15,025 vehicles a day, 4.2 times the county average; trucks are 4.8% of it, below the county-wide 5.4%.

4Northeast Regatta DriveSecondary road · 11,840vehicles418trucks · 3.5%
Road class
Secondary road
Congestion ratio
27.6%
Median trip time
48.3 min
Drivers’ median age
41.5 yrs
Drivers’ average income
$72,849

Northeast Regatta Drive carries 3.3 times the county average at its busiest, 418 of them trucks (3.5%, below the county-wide 5.4%).

5Crescent Harbor RoadTertiary road · 10,048vehicles293trucks · 2.9%
Road class
Tertiary road
Congestion ratio
25.0%
Median trip time
32.0 min
Drivers’ median age
41.9 yrs
Drivers’ average income
$77,596

Crescent Harbor Road carries 2.8 times the county average on its busiest stretch, where the median trip lasts 32.0 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1State Route 532Primary road · #1 by traffic21,273vehicles1,220trucks · 5.7%
2State Route 20Primary road · #2 by traffic18,952vehicles1,006trucks · 5.3%
3East Camano DriveSecondary road · #3 by traffic15,025vehicles724trucks · 4.8%
4State Route 525Primary road · 7,593vehicles524trucks · 6.9%
Road class
Primary road
Congestion ratio
17.7%
Median trip time
36.1 min
Drivers’ median age
60.1 yrs
Drivers’ average income
$92,422

At 2.1 times the county average, State Route 525 draws drivers from neighborhoods averaging $92,422 in household income.

5Northeast Regatta DriveSecondary road · #4 by traffic11,840vehicles418trucks · 3.5%
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

IslandDepartment 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 Island County

The same traffic breakdown for the areas closest to Island County, Washington.

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.