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Traffic heat map of Marion County, Oregon: 1,054 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 5 and Marion Street Bridge

Marion County, Oregon Traffic Counts

Our Marion County, Oregon traffic data covers 29,240 road segments over 1,054 road miles, with an average segment of just 190 ft. It is one of the top 3 counties in Oregon for highway travel volume. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Updated:
September 29, 2026
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total traffic icon

Total Traffic Volume & Performance in Marion County, Oregon

Traffic

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

vehicles per day5,716
Trucks

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

8.4%
Average travel time

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

34.2 min
Congestion ratio

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

17.1%
Drivers’ average age

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

43.9 yrs
Drivers’ average income

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

$82,611

Our data shows 5,716 vehicles per day on the average road in Marion County, Oregon, and 7,660,193 vehicle-miles traveled per day (≈2.8 billion per year) across its 1,054 miles of monitored roads. About 1 in 12 vehicles is a truck, in line with Oregon (9.2%).

Busier roads than 83% of counties in Oregon

Marion's average daily traffic volume of 5,716 vehicles per day is on par with the state average of 5,908. Across the whole network, that travel is about 8.8% of Oregon's statewide total. Marion carries more traffic than 83% of counties in Oregon.

The average trip takes 34.2 minutes, on par with the state level. Its average travel time of 34.2 minutes is shorter than 63% of counties in Oregon.

At 17.1%, the congestion ratio matches the state level closely.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Marion County, Oregon

Trafficvehicles per day17,072
Trucks11.3%
Average travel time44.4 min
Congestion ratio31.5%
Drivers’ average age44.2 yrs
Drivers’ average income$82,937

Travel in Marion County, Oregon splits roughly evenly, with about half of it (54% of vehicle-miles) on highways. The average highway carries 17,072 vehicles per day, 222% more than the average non-highway road in the same area, which carries 5,301 vehicles per day.

That comes from just 17% of the monitored road miles: 179 miles in 1,031 segments, carrying 4,135,165 vehicle-miles traveled per day (≈1.5 billion per year).

That puts Marion among the top 3 counties in Oregon for highway travel volume.

More highway trucks than 97% of counties in Oregon

Highway truck concentration here runs 6% lower than the state average, at 11.3%. The highway traffic mix is typical for Oregon: neither freight- nor commuter-dominated.

By truck concentration, highways here outrank 50% of counties in Oregon. By raw truck volume, Marion carries more highway trucks than 97% of counties in Oregon.

non-highway traffic icon

Non-highway Traffic in Marion County, Oregon

Trafficvehicles per day5,301
Trucks5.1%
Average travel time33.8 min
Congestion ratio16.6%
Drivers’ average age43.8 yrs
Drivers’ average income$82,377

Travel in Marion County, Oregon splits roughly evenly, with about half of it (46% of vehicle-miles) on local roads. A typical local road sees 5,301 vehicles per day.

Spread over 875 miles and 28,209 segments, 83% of the road network, local roads carry a lighter load per mile: 3,525,027 vehicle-miles traveled per day (≈1.3 billion per year). Trucks make up 5.1% of non-highway traffic, about 1 in 20 vehicles.

Younger drivers than 89% of counties in Oregon

The concentration of trucks on non-highway roads is 55% lower than on highways.

Non-highway congestion here (16.6%) closely tracks the state average.

Trip origins here have higher average income than 77% of counties in Oregon. 89% of counties in Oregon have an older driver population than Marion.

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 86% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 11% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +16% versus the annual average.
Lowest month:
January is the quietest month, with volumes -16% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Marion County, Oregon, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +16% in high season.

Marion County vs. Oregon Traffic Comparison

Marion County stays close to the Oregon average; the largest gap is its truck share, 8% below.

MetricMarion CountyOregon averageDifference
Traffic5,7165,908-3.3%
Truck % (Total Traffic)8.4%9.2%-8.5%
Truck % (Highway)11.3%12.0%-6.1%
Avg. Travel Time34.2 min34.3 min-0.2%

How Marion County compares

Marion County against nearby counties

Against the 4 nearest areas, Marion County moves 2.1 times the total daily travel; it has the busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

Marion County and the 4 nearest county-level areas by centroid distance, with the Oregon average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Marion County5,7168.4%7,660,19334.2 min17.1%
Yamhill County, Oregon4,1837.0%1,747,80933.7 min12.7%
Polk County, Oregon4,5397.1%1,522,96435.6 min15.3%
Clackamas County, Oregon5,2996.6%7,142,00833.1 min15.7%
Linn County, Oregon4,19312.3%4,394,23834.2 min11.4%
Oregon average5,9089.2%N/A34.3 min16.6%

Marion County ranked within Oregon

Marion County sits in Oregon's top three on highway travel volume and highway truck volume.

Marion County ranked among 36 county-level areas in Oregon (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasureMarion CountyOregon rank
Traffic volume (AADT)5,716#7 of 36
Highway vehicle-miles per day4,135,165#2 of 33
Truck share on highways11.3%#17 of 33
Highway trucks per day1,922#2 of 33
Average travel time34.2 min#23 of 36
Average driver income$82,611#9 of 36
Average driver age43.9 yrs#32 of 36

Marion County ranks #2 of 33 on highway travel volume but #32 of 36 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Marion County, Oregon

On their busiest stretches, the three busiest roads in Marion County carry 54,894 vehicles a day on average, 9.6 times the typical road in the county (5,716).

I 5 leads with 84,624 vehicles a day, 11,174 of them trucks (13.2%). No other road comes close: Marion Street Bridge, in second place, carries 41,093. It also carries the most trucks.

Trips using I 5 are long: a median of 49.5 minutes against 34.2 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 5Motorway · 84,624vehicles11,174trucks · 13.2%
Road class
Motorway
Congestion ratio
58.5%
Median trip time
49.5 min
Drivers’ median age
44.2 yrs
Drivers’ average income
$83,616

Delays build on I 5: its congestion ratio of 59% over free-flow time is well above the county's 17%.

2Marion Street BridgeTrunk road · 41,093vehicles1,927trucks · 4.7%
Road class
Trunk road
Congestion ratio
61.4%
Median trip time
39.3 min
Drivers’ median age
44.9 yrs
Drivers’ average income
$83,309

Travel on Marion Street Bridge's busiest stretch runs 61% over free-flow time, against 17% across the county, so expect slower peak hours.

3Santiam HighwayTrunk road · 38,965vehicles1,911trucks · 4.9%
Road class
Trunk road
Congestion ratio
40.2%
Median trip time
35.6 min
Drivers’ median age
44.9 yrs
Drivers’ average income
$80,616

Santiam Highway is a trunk route for the county, carrying 6.8 times the county average on its busiest stretch; trucks are 4.9% of it, below the county-wide 8.4%.

4Mission Street SoutheastTrunk road · 37,419vehicles1,800trucks · 4.8%
Road class
Trunk road
Congestion ratio
44.4%
Median trip time
35.6 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$80,106

Mission Street Southeast carries 6.5 times the county average at its busiest, 1,800 of them trucks (4.8%, below the county-wide 8.4%).

5Center Street BridgeTrunk road · 35,430vehicles1,597trucks · 4.5%
Road class
Trunk road
Congestion ratio
53.3%
Median trip time
29.9 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$86,419

Center Street Bridge carries 6.2 times the county average on its busiest stretch, where the median trip lasts 29.9 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 5Motorway · #1 by traffic84,624vehicles11,174trucks · 13.2%
2Marion Street BridgeTrunk road · #2 by traffic41,093vehicles1,927trucks · 4.7%
3Santiam HighwayTrunk road · #3 by traffic38,965vehicles1,911trucks · 4.9%
4Mission Street SoutheastTrunk road · #4 by traffic37,419vehicles1,800trucks · 4.8%
5Salem Dallas Highway NorthwestTrunk road · 34,748vehicles1,681trucks · 4.8%
Road class
Trunk road
Congestion ratio
41.5%
Median trip time
35.6 min
Drivers’ median age
43.6 yrs
Drivers’ average income
$81,648

At 6.1 times the county average, Salem Dallas Highway Northwest draws drivers from neighborhoods averaging $81,648 in household income.

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

MarionDepartment 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 Marion County

The same traffic breakdown for the areas closest to Marion County, Oregon.

Need segment-level traffic data?

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