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Traffic heat map of Polk County, Oregon: 351 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Salem Dallas Highway Northwest

Polk County, Oregon Traffic Counts

TrafficZoom tracks traffic on 351 road miles in Polk County, Oregon, divided into 7,184 segments averaging 258 ft. Its busiest road, Salem Dallas Highway Northwest, carries 36,174 vehicles a day, 8.0 times the average road. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Polk County, Oregon

Traffic

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

vehicles per day4,539
Trucks

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

7.1%
Average travel time

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

35.6 min
Congestion ratio

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

15.3%
Drivers’ average age

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

44.2 yrs
Drivers’ average income

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

$83,043

Our data shows 4,539 vehicles per day on the average road in Polk County, Oregon, and 1,522,964 vehicle-miles traveled per day (≈556 million per year) across its 351 miles of monitored roads. About 1 in 14 vehicles is a truck, fewer than the 1 in 11 across Oregon.

Busier roads than 69% of counties in Oregon

Polk sees 23% lower average daily traffic volume than the state average (4,539 vehicles per day against 5,908), suggesting less demand on each road - a critical factor for logistics and site planning. Network-wide, Polk accounts for about 1.8% of Oregon's statewide total of vehicle-miles. By volume, Polk's 4,539 vehicles per day outpaces 69% of counties in Oregon.

Journey times here (35.6 minutes on average) closely track the state level. On travel time, Polk runs longer than 60% of counties in Oregon.

Congestion is somewhat lower than the state level, at a ratio of 15.3% (7% lower).

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Polk County, Oregon

Trafficvehicles per day13,540
Trucks8.2%
Average travel time41.1 min
Congestion ratio28.3%
Drivers’ average age44.5 yrs
Drivers’ average income$77,941

Highways carry more than half of all travel in Polk County, Oregon (55% of vehicle-miles). The average highway carries 13,540 vehicles per day, 299% more than the average non-highway road in the same area, which carries 3,395 vehicles per day.

With 21% of the road miles (73 miles in 810 segments), highways punch above their length, carrying 841,764 vehicle-miles traveled per day (≈307 million per year).

Lower highway truck share than 75% of counties in Oregon

At 8.2%, highway truck share is 31% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

75% of counties in Oregon see a higher highway truck share than Polk's 8.2%. By raw truck volume, Polk carries fewer highway trucks than 62% of counties in Oregon.

non-highway traffic icon

Non-highway Traffic in Polk County, Oregon

Trafficvehicles per day3,395
Trucks5.7%
Average travel time35.0 min
Congestion ratio13.7%
Drivers’ average age44.0 yrs
Drivers’ average income$86,402

A significant share of driving in Polk County, Oregon, 45% of vehicle-miles, happens on local roads. On the average non-highway road, that comes to 3,395 vehicles per day.

Spread over 278 miles and 6,374 segments, 79% of the road network, local roads carry a lighter load per mile: 681,200 vehicle-miles traveled per day (≈249 million per year). About 1 in 18 vehicles on non-highway roads is a truck (5.7%).

Younger drivers than 86% of counties in Oregon

The concentration of trucks on non-highway roads is 31% lower than on highways.

Non-highway congestion (13.7%) runs 15% lower than the state average, pointing to smoother local traffic flow.

Polk's average driver income is higher than 80% of counties in Oregon. Polk's median driver age is lower than 86% of counties in Oregon.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 7:00 AM to 12:00 PM and PM peak 4:00 PM–7:00 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 +10% versus the annual average.
Lowest month:
February is the quietest month, with volumes -12% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Polk County, Oregon, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +10% in high season.

Polk County vs. Oregon Traffic Comparison

The highway truck share sets Polk County apart: 31% below the Oregon average. Its average daily traffic per road is also 23% below.

MetricPolk CountyOregon averageDifference
Traffic4,5395,908-23.2%
Truck % (Total Traffic)7.1%9.2%-22.9%
Truck % (Highway)8.2%12.0%-31.3%
Avg. Travel Time35.6 min34.3 min+4.0%

How Polk County compares

Polk County against nearby counties

Nothing in this table sets Polk County sharply apart from the 4 areas nearest to it, though it has the fourth busiest roads of the five.

Polk 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
Polk County4,5397.1%1,522,96435.6 min15.3%
Lincoln County, Oregon7,3037.0%1,140,66730.8 min18.2%
Yamhill County, Oregon4,1837.0%1,747,80933.7 min12.7%
Benton County, Oregon4,8607.0%1,201,25836.5 min13.9%
Marion County, Oregon5,7168.4%7,660,19334.2 min17.1%
Oregon average5,9089.2%N/A34.3 min16.6%

Polk County ranked within Oregon

Polk County sits in the bottom quarter of the Oregon field on average driver age, at #31 of 36.

Polk County ranked among 36 county-level areas in Oregon (1 = highest); measures without data in every county rank a smaller field, down to 33.
MeasurePolk CountyOregon rank
Traffic volume (AADT)4,539#12 of 36
Highway vehicle-miles per day841,764#19 of 33
Truck share on highways8.2%#25 of 33
Highway trucks per day1,116#21 of 33
Average travel time35.6 min#15 of 36
Average driver income$83,043#8 of 36
Average driver age44.2 yrs#31 of 36

The two ends of this table sit far apart: #8 of 36 on average driver income, against #31 of 36 on average driver age.

Busiest roads in Polk County, Oregon

On their busiest stretches, the three busiest roads in Polk County carry 26,063 vehicles a day on average, 5.7 times the typical road in the county (4,539).

Salem Dallas Highway Northwest leads with 36,174 vehicles a day, 1,987 of them trucks (5.5%). It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Salem Dallas Highway NorthwestTrunk road · 36,174vehicles1,987trucks · 5.5%
Road class
Trunk road
Congestion ratio
48.4%
Median trip time
34.6 min
Drivers’ median age
43.9 yrs
Drivers’ average income
$81,996

Salem Dallas Highway Northwest carries 8.0 times the county average on its busiest stretch, where the median trip lasts 34.6 minutes.

2Marion Street BridgeTrunk road · 24,254vehicles1,320trucks · 5.4%
Road class
Trunk road
Congestion ratio
59.8%
Median trip time
39.5 min
Drivers’ median age
44.5 yrs
Drivers’ average income
$81,840

Marion Street Bridge is one of the more congested roads here: trips take 60% longer than at free-flow speed, against 15% county-wide.

3Center Street BridgeTrunk road · 17,760vehicles922trucks · 5.2%
Road class
Trunk road
Congestion ratio
101.8%
Median trip time
29.8 min
Drivers’ median age
44.3 yrs
Drivers’ average income
$86,078

Delays build on Center Street Bridge: its congestion ratio of 102% over free-flow time is well above the county's 15%.

4Salem-Willamina HighwayTrunk road · 15,511vehicles1,298trucks · 8.4%
Road class
Trunk road
Congestion ratio
29.1%
Median trip time
43.5 min
Drivers’ median age
45.2 yrs
Drivers’ average income
$78,683

At 3.4 times the county average, Salem-Willamina Highway draws drivers from neighborhoods averaging $78,683 in household income.

5Monmouth Independence HighwayPrimary road · 14,323vehicles680trucks · 4.8%
Road class
Primary road
Congestion ratio
34.3%
Median trip time
36.2 min
Drivers’ median age
43.0 yrs
Drivers’ average income
$77,118

The busiest stretch of Monmouth Independence Highway carries 3.2 times the county average; trucks are 4.8% of it, below the county-wide 7.1%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Salem Dallas Highway NorthwestTrunk road · #1 by traffic36,174vehicles1,987trucks · 5.5%
2Marion Street BridgeTrunk road · #2 by traffic24,254vehicles1,320trucks · 5.4%
3Salem-Willamina HighwayTrunk road · #4 by traffic15,511vehicles1,298trucks · 8.4%
4Pacific HighwayTrunk road · 14,118vehicles1,110trucks · 7.9%
Road class
Trunk road
Congestion ratio
31.5%
Median trip time
43.1 min
Drivers’ median age
43.9 yrs
Drivers’ average income
$84,082

On its busiest stretch, Pacific Highway carries 3.1 times the county average; trucks are 7.9% of it, above the county-wide 7.1%.

5Southeast Washington StreetPrimary road · 13,187vehicles965trucks · 7.3%
Road class
Primary road
Congestion ratio
31.6%
Median trip time
41.4 min
Drivers’ median age
43.7 yrs
Drivers’ average income
$76,613

Southeast Washington Street peaks at 13,187 vehicles a day, 2.9 times the county average; trucks are 7.3% of it, in line with the county-wide 7.1%.

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

PolkDepartment 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 Polk County

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

Need segment-level traffic data?

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