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Traffic heat map of Hardin County, Iowa: 364 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Oak Street and US 20

Hardin County, Iowa Traffic Counts

How busy are the roads of Hardin County, Iowa? We measure 364 road miles, divided into 3,282 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, Oak Street, carries 8,606 vehicles a day, 6.3 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 icon

Total Traffic Volume & Performance in Hardin County, Iowa

Traffic

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

vehicles per day1,358
Trucks

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

13.1%
Average travel time

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

32.1 min
Congestion ratio

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

6.0%
Drivers’ average age

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

50.4 yrs
Drivers’ average income

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

$68,159

A typical monitored road in Hardin County, Iowa sees 1,358 vehicles per day, while its 364 miles of monitored roads together handle 555,110 vehicle-miles traveled per day (≈203 million per year). Trucks are 13.1% of traffic, more than the 11.0% across Iowa.

Traffic 55% below the Iowa average

At 1,358 vehicles per day, the average monitored road in Hardin carries 55% less traffic than the state average of 3,042, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Across the whole network, that travel is about 0.7% of Iowa's statewide total. By volume, Hardin's 1,358 vehicles per day trails 69% of counties in Iowa.

At 32.1 minutes, the average travel time matches the state level closely. 72% of counties in Iowa have a longer average travel time than Hardin's 32.1 minutes.

Congestion runs 47% lower than the state level, at a ratio of 6.0%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Hardin County, Iowa

Trafficvehicles per day3,597
Trucks19.7%
Average travel time66.6 min
Congestion ratio8.2%
Drivers’ average age45.0 yrs
Drivers’ average income$74,243

Highways carry a significant share of travel in Hardin County, Iowa: 42% of all vehicle-miles. The average highway carries 3,597 vehicles per day, 172% more than the average non-highway road in the same area, which carries 1,322 vehicles per day.

With 15% of the road miles (56 miles in 51 segments), highways punch above their length, carrying 230,494 vehicle-miles traveled per day (≈84.1 million per year).

Higher highway truck share than 74% of counties in Iowa

At 19.7%, highway truck share is 22% 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 74% of counties in Iowa. Hardin's highway truck count is higher than 57% of counties in Iowa, at roughly 708 trucks per day.

non-highway traffic icon

Non-highway Traffic in Hardin County, Iowa

Trafficvehicles per day1,322
Trucks8.3%
Average travel time31.6 min
Congestion ratio6.0%
Drivers’ average age51.3 yrs
Drivers’ average income$66,661

Local roads carry more than half of all travel in Hardin County, Iowa (58% of vehicle-miles). The average non-highway road carries 1,322 vehicles per day.

Spread over 308 miles and 3,231 segments, 85% of the road network, local roads carry a lighter load per mile: 324,616 vehicle-miles traveled per day (≈118 million per year). Trucks make up 8.3% of non-highway traffic, about 1 in 12 vehicles.

Drivers from lower-income areas than 79% of counties in Iowa

The concentration of trucks on non-highway roads is 58% lower than on highways.

Non-highway congestion (6.0%) runs 46% lower than the state average, pointing to smoother local traffic flow.

79% of counties in Iowa see higher average driver income among trip origins than Hardin. Hardin's median driver age is lower than 51% 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 76% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (+0%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +9% versus the annual average.
Lowest month:
January is the quietest month, with volumes -22% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Hardin County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +9% in high season.

Hardin County vs. Iowa Traffic Comparison

Of the four measures, average daily traffic per road differs most: Hardin County runs 55% below the Iowa average. Its highway truck share, by contrast, is 22% above.

MetricHardin CountyIowa averageDifference
Traffic1,3583,042-55.4%
Truck % (Total Traffic)13.1%11.0%+18.5%
Truck % (Highway)19.7%16.1%+22.2%
Avg. Travel Time32.1 min33.0 min-2.7%

How Hardin County compares

Hardin County against nearby counties

Against the 4 nearest areas, Hardin County carries 43.4% less traffic on a typical road and is 27.4% less congested; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Hardin 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
Hardin County1,35813.1%555,11032.1 min6.0%
Hamilton County, Iowa1,47017.2%1,145,47433.6 min6.1%
Grundy County, Iowa1,45712.6%588,70432.8 min5.6%
Story County, Iowa4,22911.3%2,315,09031.1 min12.1%
Marshall County, Iowa2,4469.3%943,01235.7 min9.3%
Iowa average3,04211.0%N/A33.0 min11.4%

Hardin County ranked within Iowa

Average driver income places Hardin County #78 of 99 in Iowa - the bottom quarter of the state.

Hardin County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureHardin CountyIowa rank
Traffic volume (AADT)1,358#69 of 99
Highway vehicle-miles per day230,494#49 of 70
Truck share on highways19.7%#19 of 70
Highway trucks per day708#31 of 70
Average travel time32.1 min#72 of 99
Average driver income$68,159#78 of 99
Average driver age50.4 yrs#51 of 99

Busiest roads in Hardin County, Iowa

Traffic concentrates on a few corridors: the three busiest roads average 7,214 vehicles a day, against 1,358 on the average road in Hardin County.

Oak Street is the busiest road, at 8,606 vehicles a day, 692 of them trucks (8.1%). US 20 carries the most trucks, 1,612 a day (19.7% of its traffic), although it ranks #2 for all traffic.

Trips using US 20 are long: a median of 66.6 minutes against 32.1 county-wide, the mark of a through route.

Freight stands out on US 20: trucks are 19.7% of the traffic there, against 13.1% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Oak StreetPrimary road · 8,606vehicles692trucks · 8.1%
Road class
Primary road
Congestion ratio
20.7%
Median trip time
29.3 min
Drivers’ median age
51.5 yrs
Drivers’ average income
$61,044

Oak Street is one of the more congested roads here: trips take 21% longer than at free-flow speed, against 6% county-wide.

2US 20Motorway · 8,197vehicles1,612trucks · 19.7%
Road class
Motorway
Congestion ratio
8.2%
Median trip time
66.6 min
Drivers’ median age
45.0 yrs
Drivers’ average income
$74,243

US 20 is a trunk route for the county, carrying 6.0 times the county average on its busiest stretch; trucks are 19.7% of it, above the county-wide 13.1%.

3US 65Primary road · 4,838vehicles357trucks · 7.4%
Road class
Primary road
Congestion ratio
9.6%
Median trip time
31.5 min
Drivers’ median age
51.3 yrs
Drivers’ average income
$61,440

US 65 carries 3.6 times the county average at its busiest, 357 of them trucks (7.4%, below the county-wide 13.1%).

4Edgington AvenuePrimary road · 4,399vehicles299trucks · 6.8%
Road class
Primary road
Congestion ratio
10.1%
Median trip time
33.0 min
Drivers’ median age
50.8 yrs
Drivers’ average income
$66,997

Edgington Avenue carries 3.2 times the county average on its busiest stretch, where the median trip lasts 33.0 minutes.

5Washington AvenueSecondary road · 2,792vehicles171trucks · 6.1%
Road class
Secondary road
Congestion ratio
8.0%
Median trip time
26.8 min
Drivers’ median age
51.6 yrs
Drivers’ average income
$65,294

At 2.1 times the county average, Washington Avenue draws drivers from neighborhoods averaging $65,294 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 20Motorway · #2 by traffic8,197vehicles1,612trucks · 19.7%
2Oak StreetPrimary road · #1 by traffic8,606vehicles692trucks · 8.1%
3US 65Primary road · #3 by traffic4,838vehicles357trucks · 7.4%
4Edgington AvenuePrimary road · #4 by traffic4,399vehicles299trucks · 6.8%
5Hardin StreetPrimary road · 2,148vehicles236trucks · 11.0%
Road class
Primary road
Congestion ratio
4.7%
Median trip time
32.9 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$61,213

Hardin Street carries 58% more than the county average on its busiest stretch, where the median trip lasts 32.9 minutes.

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

HardinDepartment 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 Hardin County

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

Need segment-level traffic data?

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