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Traffic heat map of Mason County, Washington: 352 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 101 and 1st Street

Mason County, Washington Traffic Counts

How busy are the roads of Mason County, Washington? We measure 352 road miles, divided into 5,993 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, US 101, carries 26,800 vehicles a day, 7.7 times the average road. The breakdown below covers volume, trucks, congestion and driver profiles for retailers, logistics planners and engineers.
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 Mason County, Washington

Traffic

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

vehicles per day3,459
Trucks

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

5.8%
Average travel time

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

33.7 min
Congestion ratio

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

12.5%
Drivers’ average age

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

48.6 yrs
Drivers’ average income

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

$81,750

A typical monitored road in Mason County, Washington sees 3,459 vehicles per day, while its 352 miles of monitored roads together handle 1,196,383 vehicle-miles traveled per day (≈437 million per year). Trucks are a smaller part of the mix than across Washington: 5.8% against 7.1%.

Traffic 53% below the Washington average

Mason's average daily traffic volume is 53% lower than the state average - 3,459 vehicles per day against 7,322 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.8% of Washington's statewide total. Mason carries less traffic than 55% of counties in Washington.

Journey times here (33.7 minutes on average) closely track the state level. Its average travel time of 33.7 minutes is shorter than 53% of counties in Washington.

The congestion ratio of 12.5% is 37% lower, pointing to smoother traffic flow than the state level - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Mason County, Washington

Trafficvehicles per day6,645
Trucks6.7%
Average travel time34.1 min
Congestion ratio16.1%
Drivers’ average age47.5 yrs
Drivers’ average income$78,985

Highways carry a significant share of travel in Mason County, Washington: 34% of all vehicle-miles. The average highway carries 6,645 vehicles per day, 111% more than the average non-highway road in the same area, which carries 3,147 vehicles per day.

With 14% of the road miles (49 miles in 534 segments), highways punch above their length, carrying 408,531 vehicle-miles traveled per day (≈149 million per year).

Lower highway truck share than 97% of counties in Washington

At 6.7%, highway truck share is 30% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 97% of counties in Washington. 72% of counties in Washington see more highway trucks per day than Mason's roughly 445.

non-highway traffic icon

Non-highway Traffic in Mason County, Washington

Trafficvehicles per day3,147
Trucks5.3%
Average travel time33.6 min
Congestion ratio12.1%
Drivers’ average age48.9 yrs
Drivers’ average income$82,957

Local roads carry more than half of all travel in Mason County, Washington (66% of vehicle-miles). The average non-highway road carries 3,147 vehicles per day.

Spread over 303 miles and 5,459 segments, 86% of the road network, local roads carry a lighter load per mile: 787,852 vehicle-miles traveled per day (≈288 million per year). Trucks make up 5.3% of non-highway traffic, about 1 in 19 vehicles.

Local congestion 38% below the Washington average

The concentration of trucks on non-highway roads is 20% lower than on highways.

The non-highway congestion ratio of 12.1% is 38% lower than the state level, suggesting more efficient local mobility than the state average.

Trip origins here have higher average income than 58% of counties in Washington. 61% of counties in Washington have a younger driver population than Mason.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 3:00 PM–5:00 PM, with volumes reaching approximately 97% higher than the daily average.
Weekend traffic:
Weekends are busier than weekdays: volumes run about 16% above weekday levels, which usually points to leisure, tourism or shopping traffic.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +37% versus the annual average.
Lowest month:
January is the quietest month, with volumes -32% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Mason County, Washington, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +37% in high season.

Mason County vs. Washington Traffic Comparison

Of the four measures, average daily traffic per road differs most: Mason County runs 53% below the Washington average. Its highway truck share is also 30% below.

MetricMason CountyWashington averageDifference
Traffic3,4597,322-52.8%
Truck % (Total Traffic)5.8%7.1%-18.5%
Truck % (Highway)6.7%9.5%-29.5%
Avg. Travel Time33.7 min33.2 min+1.5%

How Mason County compares

Mason County against nearby counties

Against the 4 nearest areas, Mason County moves 34.1% 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.

Mason 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
Mason County3,4595.8%1,196,38333.7 min12.5%
Thurston County, Washington6,6117.5%6,678,19330.2 min20.5%
Grays Harbor County, Washington3,4747.6%1,774,89834.7 min11.4%
Kitsap County, Washington5,6805.6%4,727,59131.5 min15.7%
Jefferson County, Washington3,1348.1%866,50038.8 min11.7%
Washington average7,3227.1%N/A33.2 min19.9%

Mason County ranked within Washington

Truck share on highways places Mason County #32 of 33 in Washington - the bottom quarter of the state.

Mason County ranked among 39 county-level areas in Washington (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureMason CountyWashington rank
Traffic volume (AADT)3,459#22 of 39
Highway vehicle-miles per day408,531#24 of 33
Truck share on highways6.7%#32 of 33
Highway trucks per day445#24 of 33
Average travel time33.7 min#21 of 39
Average driver income$81,750#17 of 39
Average driver age48.6 yrs#16 of 39

Busiest roads in Mason County, Washington

Traffic concentrates on a few corridors: the three busiest roads average 20,358 vehicles a day, against 3,459 on the average road in Mason County.

US 101 leads with 26,800 vehicles a day, 1,567 of them trucks (5.8%). It tops the truck ranking too, with the most trucks.

Trips using 1st Street are long: a median of 46.8 minutes against 33.7 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 101Trunk road · 26,800vehicles1,567trucks · 5.8%
Road class
Trunk road
Congestion ratio
33.6%
Median trip time
34.5 min
Drivers’ median age
47.1 yrs
Drivers’ average income
$81,658

At 7.7 times the county average, US 101 draws drivers from neighborhoods averaging $81,658 in household income.

21st StreetPrimary road · 18,630vehicles834trucks · 4.5%
Road class
Primary road
Congestion ratio
42.2%
Median trip time
46.8 min
Drivers’ median age
48.1 yrs
Drivers’ average income
$74,719

Delays build on 1st Street: its congestion ratio of 42% over free-flow time is well above the county's 12%.

3Southeast State Route 3Primary road · 15,644vehicles714trucks · 4.6%
Road class
Primary road
Congestion ratio
36.8%
Median trip time
36.6 min
Drivers’ median age
47.7 yrs
Drivers’ average income
$80,552

At 4.5 times the county average, Southeast State Route 3 draws drivers from neighborhoods averaging $80,552 in household income.

4Northeast State Route 3Primary road · 14,350vehicles882trucks · 6.2%
Road class
Primary road
Congestion ratio
38.6%
Median trip time
32.9 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$94,495

Travel on Northeast State Route 3's busiest stretch runs 39% over free-flow time, against 12% across the county, so expect slower peak hours.

5Olympic HighwayPrimary road · 12,218vehicles477trucks · 3.9%
Road class
Primary road
Congestion ratio
24.8%
Median trip time
36.0 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$78,381

The busiest stretch of Olympic Highway carries 3.5 times the county average; trucks are 3.9% of it, below the county-wide 5.8%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 101Trunk road · #1 by traffic26,800vehicles1,567trucks · 5.8%
2Northeast State Route 3Primary road · #4 by traffic14,350vehicles882trucks · 6.2%
31st StreetPrimary road · #2 by traffic18,630vehicles834trucks · 4.5%
4Southeast State Route 3Primary road · #3 by traffic15,644vehicles714trucks · 4.6%
5State Route 3Primary road · 9,827vehicles596trucks · 6.1%
Road class
Primary road
Congestion ratio
28.7%
Median trip time
33.6 min
Drivers’ median age
49.4 yrs
Drivers’ average income
$87,004

On its busiest stretch, State Route 3 carries 2.8 times the county average; trucks are 6.1% of it, in line with the county-wide 5.8%.

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

MasonDepartment 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 Mason County

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

Need segment-level traffic data?

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