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Traffic heat map of Linn County, Iowa: 857 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Avenue of the Saints

Linn County, Iowa Traffic Counts

Our Linn County, Iowa traffic data covers 17,119 road segments over 857 road miles, with an average segment of just 264 ft. It ranks among the top 3 counties in Iowa for average daily traffic. 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 Volume & Performance in Linn County, Iowa

Traffic

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

vehicles per day5,107
Trucks

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

7.5%
Average travel time

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

34.6 min
Congestion ratio

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

14.5%
Drivers’ average age

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

45.6 yrs
Drivers’ average income

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

$89,106

A typical monitored road in Linn County, Iowa sees 5,107 vehicles per day, while its 857 miles of monitored roads together handle 4,350,192 vehicle-miles traveled per day (≈1.6 billion per year). Trucks are a smaller part of the mix than across Iowa: 7.5% against 11.0%.

Busier roads than 98% of counties in Iowa

At 5,107 vehicles per day, the average monitored road in Linn carries 68% more traffic than the state average of 3,042, suggesting more demand on each road - prime passing trade for storefronts, with more competition for road space. Across the whole network, that travel is about 5.2% of Iowa's statewide total. Linn carries more traffic than 98% of counties in Iowa.

At 34.6 minutes, the average travel time matches the state level closely. Its average travel time of 34.6 minutes is longer than 64% of counties in Iowa.

Congestion runs 27% higher than the state level, at a ratio of 14.5%, which means more pronounced congestion - expect slower peak-hour deliveries and less predictable arrival times.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Linn County, Iowa

Trafficvehicles per day9,976
Trucks10.3%
Average travel time36.7 min
Congestion ratio18.0%
Drivers’ average age45.3 yrs
Drivers’ average income$89,172

Travel in Linn County, Iowa splits roughly evenly, with about half of it (46% of vehicle-miles) on highways. The average highway carries 9,976 vehicles per day, 104% more than the average non-highway road in the same area, which carries 4,878 vehicles per day.

Highways make up 25% of the monitored road miles (211 miles, 767 segments), so they carry more than their share: 2,010,341 vehicle-miles traveled per day (≈734 million per year).

No more than 2 other counties in Iowa move more traffic on their highways.

Lower highway truck share than 99% of counties in Iowa

The concentration of trucks on highways (10.3%) is 36% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 99% of counties in Iowa. Linn's highway truck count is higher than 62% of counties in Iowa, at roughly 1,031 trucks per day.

non-highway traffic icon

Non-highway Traffic in Linn County, Iowa

Trafficvehicles per day4,878
Trucks5.0%
Average travel time34.5 min
Congestion ratio14.3%
Drivers’ average age45.7 yrs
Drivers’ average income$89,056

Travel in Linn County, Iowa splits roughly evenly, with about half of it (54% of vehicle-miles) on local roads. A typical local road sees 4,878 vehicles per day.

Local roads make up 75% of the monitored road miles (647 miles in 16,352 segments) but carry less than their share of travel: 2,339,852 vehicle-miles traveled per day (≈854 million per year). The truck share on non-highway roads is 5.0%.

Drivers from higher-income areas than 94% of counties in Iowa

The concentration of trucks on non-highway roads is 52% lower than on highways.

Non-highway congestion (14.3%) runs 29% higher than the state average, pointing to slower local traffic flow.

94% of counties in Iowa see lower average driver income among trip origins than Linn. The driver population here skews younger than 90% of counties in Iowa.

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 a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 69% higher than the daily average.
Weekend traffic:
Weekends are busier than weekdays: volumes run about 6% 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 +6% versus the annual average.
Lowest month:
January is the quietest month, with volumes -6% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Linn County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +6% in high season.

Linn County vs. Iowa Traffic Comparison

Linn County's biggest difference from the Iowa average is its average daily traffic per road, 68% above it. Its highway truck share, by contrast, is 36% below.

MetricLinn CountyIowa averageDifference
Traffic5,1073,042+67.9%
Truck % (Total Traffic)7.5%11.0%-32.3%
Truck % (Highway)10.3%16.1%-35.8%
Avg. Travel Time34.6 min33.0 min+5.0%

How Linn County compares

Linn County has the lowest truck share of its nearby counties

Set against the average of the 4 areas nearest to it, Linn County carries 105.8% more traffic on a typical road and moves 3.1 times the total daily travel; it has the busiest roads of the five. It is where traffic concentrates in this corner of the map - the local bottleneck, with more vehicles per road AND less room to absorb them.

Linn County and the 4 nearest county-level areas by centroid distance, with the Iowa average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Linn County5,1077.5%4,350,19234.6 min14.5%
Jones County, Iowa1,7529.6%559,71233.2 min6.9%
Benton County, Iowa1,88110.4%853,92831.4 min6.9%
Delaware County, Iowa1,48611.3%611,00331.5 min6.9%
Johnson County, Iowa4,80811.6%3,555,94630.1 min15.6%
Iowa average3,04211.0%N/A33.0 min11.4%

Linn County ranked within Iowa

Linn County sits in Iowa's top three on average daily traffic volume and highway travel volume.

Linn County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureLinn CountyIowa rank
Traffic volume (AADT)5,107#3 of 99
Highway vehicle-miles per day2,010,341#2 of 70
Truck share on highways10.3%#69 of 70
Highway trucks per day1,031#27 of 70
Average travel time34.6 min#36 of 99
Average driver income$89,106#7 of 99
Average driver age45.6 yrs#89 of 99

Linn County ranks #2 of 70 on highway travel volume but #69 of 70 on truck share on highways. It carries some of the heaviest highway traffic in Iowa, but very little of it is freight - this is commuter and local car volume, not through-trucking.

Busiest roads in Linn County, Iowa

The three busiest roads in Linn County average 26,188 vehicles a day, 5.1 times the county average of 5,107 across all its monitored roads.

Avenue of the Saints is the busiest road, at 31,450 vehicles a day, 3,711 of them trucks (11.8%). It tops the truck ranking too, with the most trucks.

Freight stands out on Lincoln Freeway: trucks are 12.8% of the traffic there, against 7.5% county-wide.

The truck ranking looks different from the traffic one, sharing just 2 of its 5 roads.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Avenue of the SaintsMotorway · 31,450vehicles3,711trucks · 11.8%
Road class
Motorway
Congestion ratio
33.1%
Median trip time
37.1 min
Drivers’ median age
44.9 yrs
Drivers’ average income
$89,241

A main artery: Avenue of the Saints's busiest stretch carries 6.2 times the county average; trucks are 11.8% of it, above the county-wide 7.5%.

2Collins Road NortheastTrunk road · 24,390vehicles1,193trucks · 4.9%
Road class
Trunk road
Congestion ratio
30.0%
Median trip time
33.6 min
Drivers’ median age
45.6 yrs
Drivers’ average income
$84,212

Collins Road Northeast peaks at 24,390 vehicles a day, 4.8 times the county average; trucks are 4.9% of it, below the county-wide 7.5%.

3Marion BoulevardPrimary road · 22,724vehicles918trucks · 4.0%
Road class
Primary road
Congestion ratio
58.1%
Median trip time
34.0 min
Drivers’ median age
46.5 yrs
Drivers’ average income
$83,487

Delays build on Marion Boulevard: its congestion ratio of 58% over free-flow time is well above the county's 14%.

4Edgewood Road SouthwestPrimary road · 21,641vehicles759trucks · 3.5%
Road class
Primary road
Congestion ratio
43.2%
Median trip time
34.0 min
Drivers’ median age
44.6 yrs
Drivers’ average income
$79,048

Travel on Edgewood Road Southwest's busiest stretch runs 43% over free-flow time, against 14% across the county, so expect slower peak hours.

5US 151Trunk road · 21,079vehicles1,713trucks · 8.1%
Road class
Trunk road
Congestion ratio
24.2%
Median trip time
36.7 min
Drivers’ median age
46.4 yrs
Drivers’ average income
$90,932

US 151 carries 4.1 times the county average at its busiest, 1,713 of them trucks (8.1%, above the county-wide 7.5%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1Avenue of the SaintsMotorway · #1 by traffic31,450vehicles3,711trucks · 11.8%
2Lincoln FreewayMotorway · 19,562vehicles2,503trucks · 12.8%
Road class
Motorway
Congestion ratio
24.1%
Median trip time
34.2 min
Drivers’ median age
44.8 yrs
Drivers’ average income
$87,986

Lincoln Freeway carries 3.8 times the county average on its busiest stretch, where the median trip lasts 34.2 minutes.

3US 30Motorway · 19,124vehicles2,380trucks · 12.4%
Road class
Motorway
Congestion ratio
25.0%
Median trip time
33.5 min
Drivers’ median age
44.8 yrs
Drivers’ average income
$88,539

At 3.7 times the county average, US 30 draws drivers from neighborhoods averaging $88,539 in household income.

4US 151Trunk road · #5 by traffic21,079vehicles1,713trucks · 8.1%
5Marion Airport RoadTrunk road · 13,863vehicles1,287trucks · 9.3%
Road class
Trunk road
Congestion ratio
17.0%
Median trip time
44.2 min
Drivers’ median age
47.1 yrs
Drivers’ average income
$83,847

The busiest stretch of Marion Airport Road carries 2.7 times the county average; trucks are 9.3% of it, above the county-wide 7.5%.

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

LinnDepartment 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 Linn County

The same traffic breakdown for the areas closest to Linn County, Iowa.

Need segment-level traffic data?

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