Need segment-level traffic data?

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

Get insights →
Traffic heat map of Hamilton County, Iowa: 394 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 35 and US 20

Hamilton County, Iowa Traffic Counts

How busy are the roads of Hamilton County, Iowa? We measure 394 road miles, divided into 2,955 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, I 35, carries 22,052 vehicles a day, 15.0 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
Find my place
total traffic icon

Total Traffic Volume & Performance in Hamilton County, Iowa

Traffic

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

vehicles per day1,470
Trucks

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

17.2%
Average travel time

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

33.6 min
Congestion ratio

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

6.1%
Drivers’ average age

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

47.3 yrs
Drivers’ average income

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

$78,452

The average monitored road in Hamilton County, Iowa carries 1,470 vehicles per day. Across its 394 miles of monitored roads, that adds up to 1,145,474 vehicle-miles traveled per day (≈418 million per year). Freight weighs heavily here: trucks are 17.2% of traffic, against 11.0% across Iowa.

Traffic 52% below the Iowa average

Hamilton's average daily traffic volume is 52% lower than the state average - 1,470 vehicles per day against 3,042 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Hamilton accounts for about 1.4% of Iowa's statewide total of vehicle-miles. By volume, Hamilton's 1,470 vehicles per day trails 60% of counties in Iowa.

The average trip takes 33.6 minutes, on par with the state level. 52% of counties in Iowa have a shorter average travel time than Hamilton's 33.6 minutes.

Congestion runs 46% lower than the state level, at a ratio of 6.1%, which means smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Hamilton County, Iowa

Trafficvehicles per day6,768
Trucks20.2%
Average travel time63.3 min
Congestion ratio15.0%
Drivers’ average age44.5 yrs
Drivers’ average income$80,115

Most travel in Hamilton County, Iowa happens on highways, 74% of all vehicle-miles. The average highway carries 6,768 vehicles per day, 419% more than the average non-highway road in the same area, which carries 1,303 vehicles per day.

With 27% of the road miles (108 miles in 90 segments), highways punch above their length, carrying 844,735 vehicle-miles traveled per day (≈308 million per year).

By highway travel volume, Hamilton outranks 81% of counties in Iowa.

Higher highway truck share than 77% of counties in Iowa

The concentration of trucks on highways (20.2%) is 26% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

By truck concentration, highways here outrank 77% of counties in Iowa. Hamilton's highway truck count is higher than 74% of counties in Iowa, at roughly 1,369 trucks per day.

non-highway traffic icon

Non-highway Traffic in Hamilton County, Iowa

Trafficvehicles per day1,303
Trucks8.7%
Average travel time32.7 min
Congestion ratio5.9%
Drivers’ average age51.2 yrs
Drivers’ average income$76,580

Local roads carry a smaller share of travel in Hamilton County, Iowa, 26% of vehicle-miles; most driving happens on highways. The average non-highway road carries 1,303 vehicles per day.

Local roads make up 73% of the monitored road miles (286 miles in 2,865 segments) but carry less than their share of travel: 300,740 vehicle-miles traveled per day (≈110 million per year). The truck share on non-highway roads is 8.7%.

Younger drivers than 79% of counties in Iowa

Non-highway roads carry a truck concentration that's 57% lower than the highway network.

At 47% lower than the state level, the non-highway congestion ratio of 5.9% signals easier movement on local roads.

69% of counties in Iowa see lower average driver income among trip origins than Hamilton. 79% of counties in Iowa have an older driver population than Hamilton.

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 68% higher than the daily average.
Weekend traffic:
Weekend traffic is about as busy as on weekdays (-2%): leisure and through trips largely replace the commute.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +11% versus the annual average.
Lowest month:
January is the quietest month, with volumes -21% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Hamilton County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +11% in high season.

Hamilton County vs. Iowa Traffic Comparison

The truck share sets Hamilton County apart: 56% above the Iowa average. Its average daily traffic per road, by contrast, is 52% below.

MetricHamilton CountyIowa averageDifference
Traffic1,4703,042-51.7%
Truck % (Total Traffic)17.2%11.0%+56.3%
Truck % (Highway)20.2%16.1%+25.7%
Avg. Travel Time33.6 min33.0 min+1.9%

How Hamilton County compares

Hamilton County has a higher truck share than any nearby county

Set against the average of the 4 areas nearest to it, Hamilton County carries 40.0% less traffic on a typical road and is 33.1% less congested; it has the fourth busiest roads of the five. Freight passes through here that never reaches the areas around it: the truck share is high precisely because the local car traffic is not.

Hamilton 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
Hamilton County1,47017.2%1,145,47433.6 min6.1%
Hardin County, Iowa1,35813.1%555,11032.1 min6.0%
Webster County, Iowa2,16710.3%942,09037.5 min10.5%
Story County, Iowa4,22911.3%2,315,09031.1 min12.1%
Boone County, Iowa2,0469.4%693,00735.3 min8.0%
Iowa average3,04211.0%N/A33.0 min11.4%

Hamilton County ranked within Iowa

Highway travel volume places Hamilton County #14 of 70 in Iowa - the top quarter of the state.

Hamilton County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureHamilton CountyIowa rank
Traffic volume (AADT)1,470#60 of 99
Highway vehicle-miles per day844,735#14 of 70
Truck share on highways20.2%#17 of 70
Highway trucks per day1,369#19 of 70
Average travel time33.6 min#48 of 99
Average driver income$78,452#31 of 99
Average driver age47.3 yrs#78 of 99

Busiest roads in Hamilton County, Iowa

On their busiest stretches, the three busiest roads in Hamilton County carry 12,955 vehicles a day on average, 8.8 times the typical road in the county (1,470).

I 35 leads with 22,052 vehicles a day, 4,570 of them trucks (20.7%). That is 2.3 times the next road, US 20 (9,586). It tops the truck ranking too, with the most trucks.

I 35 carries longer journeys than most roads here, with a median trip of 63.6 minutes against 33.6 county-wide.

Few trucks use Superior Street: 4.2% of its traffic, under half the county's 17.2%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 35Motorway · 22,052vehicles4,570trucks · 20.7%
Road class
Motorway
Congestion ratio
20.3%
Median trip time
63.6 min
Drivers’ median age
43.6 yrs
Drivers’ average income
$82,868

Travel on I 35's busiest stretch runs 20% over free-flow time, against 6% across the county, so expect slower peak hours.

2US 20Motorway · 9,586vehicles1,836trucks · 19.1%
Road class
Motorway
Congestion ratio
9.8%
Median trip time
61.9 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$75,303

Drivers on US 20 are on long journeys, a median 61.9 minutes against 33.6 county-wide: a through route more than a local street.

3Superior StreetSecondary road · 7,227vehicles305trucks · 4.2%
Road class
Secondary road
Congestion ratio
16.2%
Median trip time
29.4 min
Drivers’ median age
51.5 yrs
Drivers’ average income
$73,375

Superior Street is one of the more congested roads here: trips take 16% longer than at free-flow speed, against 6% county-wide.

4Fair Meadow DriveSecondary road · 4,704vehicles195trucks · 4.2%
Road class
Secondary road
Median trip time
28.5 min
Drivers’ median age
49.7 yrs
Drivers’ average income
$78,751

Fair Meadow Drive carries 3.2 times the county average on its busiest stretch, where the median trip lasts 28.5 minutes.

5Ohio StreetSecondary road · 3,971vehicles167trucks · 4.2%
Road class
Secondary road
Congestion ratio
9.6%
Median trip time
32.7 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$80,213

At 2.7 times the county average, Ohio Street draws drivers from neighborhoods averaging $80,213 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 35Motorway · #1 by traffic22,052vehicles4,570trucks · 20.7%
2US 20Motorway · #2 by traffic9,586vehicles1,836trucks · 19.1%
3220th StreetPrimary road · 3,262vehicles358trucks · 11.0%
Road class
Primary road
Median trip time
37.3 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$68,686

The busiest stretch of 220th Street carries 2.2 times the county average; trucks are 11.0% of it, below the county-wide 17.2%.

4Briggs Woods RoadPrimary road · 3,710vehicles342trucks · 9.2%
Road class
Primary road
Congestion ratio
7.7%
Median trip time
45.8 min
Drivers’ median age
53.5 yrs
Drivers’ average income
$82,449

Briggs Woods Road carries through traffic: the median trip using it lasts 45.8 minutes, against 33.6 for the county.

5Superior StreetSecondary road · #3 by traffic7,227vehicles305trucks · 4.2%
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

HamiltonDepartment 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.
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Hamilton County

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

Need segment-level traffic data?

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