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Traffic heat map of Iowa County, Iowa: 302 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 80 and IA 149

Iowa County, Iowa Traffic Counts

How busy are the roads of Iowa County, Iowa? We measure 302 road miles, divided into 2,831 segments, with multi-sourced, cross-verified mobile and sensor data. Its highways rank among the top 3 counties in Iowa for trucks per day. 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 icon

Total Traffic Volume & Performance in Iowa County, Iowa

Traffic

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

vehicles per day1,728
Trucks

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

17.9%
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.

6.5%
Drivers’ average age

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

45.7 yrs
Drivers’ average income

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

$77,547

The average monitored road in Iowa County, Iowa carries 1,728 vehicles per day. Across its 302 miles of monitored roads, that adds up to 954,057 vehicle-miles traveled per day (≈348 million per year). About 1 in 6 vehicles is a truck, well above the 11.0% across Iowa - a freight-heavy mix.

Congestion 44% below the Iowa average

At 1,728 vehicles per day, the average monitored road in Iowa carries 43% less traffic than the state average of 3,042, suggesting less demand on each road - less drive-by exposure for retail, but easier access for deliveries. In total volume terms, its road network carries about 1.1% of Iowa's statewide total of vehicle-miles. By volume, Iowa's 1,728 vehicles per day outpaces 50% of counties in Iowa.

Journey times here (33.7 minutes on average) closely track the state level. Its average travel time of 33.7 minutes is longer than 54% of counties in Iowa.

The congestion ratio of 6.5% is 44% 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 Iowa County, Iowa

Trafficvehicles per day9,980
Trucks23.5%
Average travel time59.3 min
Congestion ratio22.3%
Drivers’ average age43.4 yrs
Drivers’ average income$81,142

A little more than half of the driving in Iowa County, Iowa happens on highways: 62% of all vehicle-miles. The average highway carries 9,980 vehicles per day, 544% more than the average non-highway road in the same area, which carries 1,549 vehicles per day.

Yet highways are only 17% of the road network, 52 miles in 60 segments, so each mile of them is 3.6 times as busy as the average road mile.

78% of counties in Iowa move less traffic on their highways.

More highway trucks than 97% of counties in Iowa

At 23.5%, highway truck share is 46% higher than the state average. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 88% of counties in Iowa. Iowa's highway truck count is higher than 97% of counties in Iowa, at roughly 2,345 trucks per day.

non-highway traffic icon

Non-highway Traffic in Iowa County, Iowa

Trafficvehicles per day1,549
Trucks8.8%
Average travel time33.1 min
Congestion ratio6.1%
Drivers’ average age48.5 yrs
Drivers’ average income$75,429

A significant share of driving in Iowa County, Iowa, 38% of vehicle-miles, happens on local roads. A typical local road sees 1,549 vehicles per day.

Spread over 251 miles and 2,771 segments, 83% of the road network, local roads carry a lighter load per mile: 362,493 vehicle-miles traveled per day (≈132 million per year). About 1 in 11 vehicles on non-highway roads is a truck (8.8%).

Younger drivers than 89% of counties in Iowa

Non-highway roads carry a truck concentration that's 63% lower than the highway network.

At 45% lower than the state level, the non-highway congestion ratio of 6.1% signals easier movement on local roads.

67% of counties in Iowa see lower average driver income among trip origins than Iowa. Iowa's median driver age is lower than 89% 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 PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 79% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 27% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +7% versus the annual average.
Lowest month:
January is the quietest month, with volumes -19% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

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

Iowa County vs. Iowa Traffic Comparison

Iowa County's biggest difference from the Iowa average is its truck share, 63% above it. Its highway truck share is also 46% above.

MetricIowa CountyIowa averageDifference
Traffic1,7283,042-43.2%
Truck % (Total Traffic)17.9%11.0%+62.8%
Truck % (Highway)23.5%16.1%+46.0%
Avg. Travel Time33.7 min33.0 min+2.1%

How Iowa County compares

Iowa County against nearby counties

Compared with its 4 closest neighbours, Iowa County is 24.4% less congested and carries 29.9% less traffic on a typical road; it has the fourth busiest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Iowa 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
Iowa County1,72817.9%954,05733.7 min6.5%
Johnson County, Iowa4,80811.6%3,555,94630.1 min15.6%
Poweshiek County, Iowa2,00820.4%768,56231.3 min6.7%
Keokuk County, Iowa1,17010.1%254,38838.5 min5.0%
Benton County, Iowa1,88110.4%853,92831.4 min6.9%
Iowa average3,04211.0%N/A33.0 min11.4%

Iowa County ranked within Iowa

Iowa County sits in Iowa's top three on highway truck volume.

Iowa County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureIowa CountyIowa rank
Traffic volume (AADT)1,728#50 of 99
Highway vehicle-miles per day591,565#16 of 70
Truck share on highways23.5%#9 of 70
Highway trucks per day2,345#3 of 70
Average travel time33.7 min#46 of 99
Average driver income$77,547#33 of 99
Average driver age45.7 yrs#88 of 99

Iowa County ranks #3 of 70 on highway truck volume but #88 of 99 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Iowa County, Iowa

Traffic concentrates on a few corridors: the three busiest roads average 12,225 vehicles a day, against 1,728 on the average road in Iowa County.

I 80 is the busiest road, at 22,768 vehicles a day, 5,351 of them trucks (23.5%). That is 3.2 times the next road, IA 149 (7,166). It also carries the most trucks.

I 80 carries longer journeys than most roads here, with a median trip of 59.3 minutes against 33.7 county-wide.

IA 149 is busy with cars rather than freight: only 6.4% of its traffic is trucks, against 17.9% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 80Motorway · 22,768vehicles5,351trucks · 23.5%
Road class
Motorway
Congestion ratio
22.3%
Median trip time
59.3 min
Drivers’ median age
43.4 yrs
Drivers’ average income
$81,142

Travel on I 80's busiest stretch runs 22% over free-flow time, against 6% across the county, so expect slower peak hours.

2IA 149Primary road · 7,166vehicles460trucks · 6.4%
Road class
Primary road
Congestion ratio
17.0%
Median trip time
31.9 min
Drivers’ median age
46.5 yrs
Drivers’ average income
$77,995

IA 149 is one of the more congested roads here: trips take 17% longer than at free-flow speed, against 6% county-wide.

3W AvenuePrimary road · 6,742vehicles621trucks · 9.2%
Road class
Primary road
Congestion ratio
14.3%
Median trip time
41.1 min
Drivers’ median age
46.4 yrs
Drivers’ average income
$93,495

W Avenue carries 3.9 times the county average on its busiest stretch, where the median trip lasts 41.1 minutes.

432nd AvenuePrimary road · 6,737vehicles530trucks · 7.9%
Road class
Primary road
Congestion ratio
16.0%
Median trip time
35.0 min
Drivers’ median age
47.3 yrs
Drivers’ average income
$92,263

At 3.9 times the county average, 32nd Avenue draws drivers from neighborhoods averaging $92,263 in household income.

5West AvenuePrimary road · 5,309vehicles493trucks · 9.3%
Road class
Primary road
Congestion ratio
12.2%
Median trip time
36.4 min
Drivers’ median age
46.8 yrs
Drivers’ average income
$94,273

The busiest stretch of West Avenue carries 3.1 times the county average; trucks are 9.3% of it, below the county-wide 17.9%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 80Motorway · #1 by traffic22,768vehicles5,351trucks · 23.5%
2W AvenuePrimary road · #3 by traffic6,742vehicles621trucks · 9.2%
332nd AvenuePrimary road · #4 by traffic6,737vehicles530trucks · 7.9%
4West AvenuePrimary road · #5 by traffic5,309vehicles493trucks · 9.3%
5IA 149Primary road · #2 by traffic7,166vehicles460trucks · 6.4%
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

IowaDepartment 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 Iowa County

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

Need segment-level traffic data?

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