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Traffic heat map of O'Brien County, Iowa: 302 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Park Street and US-18

O'Brien County, Iowa Traffic Counts

How busy are the roads of O'Brien County, Iowa? We measure 302 road miles, divided into 2,666 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, Park Street, carries 7,939 vehicles a day, 5.9 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 O'Brien County, Iowa

Traffic

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

vehicles per day1,346
Trucks

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

8.9%
Average travel time

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

37.8 min
Congestion ratio

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

6.8%
Drivers’ average age

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

48.2 yrs
Drivers’ average income

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

$74,177

The average monitored road in O'Brien County, Iowa carries 1,346 vehicles per day. Across its 302 miles of monitored roads, that adds up to 318,716 vehicle-miles traveled per day (≈116 million per year). About 1 in 11 vehicles is a truck, fewer than the 1 in 9 across Iowa.

Longer trips than 87% of counties in Iowa

O'Brien's average daily traffic volume is 56% lower than the state average - 1,346 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. In total volume terms, its road network carries about 0.4% of Iowa's statewide total of vehicle-miles. By volume, O'Brien's 1,346 vehicles per day trails 72% of counties in Iowa.

Journey times run 15% higher than the state level, at 37.8 minutes on average. 87% of counties in Iowa have a shorter average travel time than O'Brien's 37.8 minutes.

Congestion runs 41% lower than the state level, at a ratio of 6.8%, which means smoother traffic flow - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in O'Brien County, Iowa

Trafficvehicles per day2,117
Trucks13.9%
Average travel time53.1 min
Congestion ratio4.8%
Drivers’ average age47.8 yrs
Drivers’ average income$81,615

Highways carry only a small share of the traffic in O'Brien County, Iowa, 12% of all vehicle-miles. The average highway carries 2,117 vehicles per day, 59% more than the average non-highway road in the same area, which carries 1,328 vehicles per day.

With 6% of the road miles (17 miles in 60 segments), highways punch above their length, carrying 36,998 vehicle-miles traveled per day (≈13.5 million per year).

The fewest highway trucks of any county in Iowa

At 13.9%, highway truck share is 14% lower than the state average. The highway traffic mix is typical for Iowa: neither freight- nor commuter-dominated.

By truck concentration, highways here trail 57% of counties in Iowa. At roughly 297 trucks per day, O'Brien carries the lowest volume of highway trucks in Iowa.

non-highway traffic icon

Non-highway Traffic in O'Brien County, Iowa

Trafficvehicles per day1,328
Trucks8.3%
Average travel time37.5 min
Congestion ratio6.8%
Drivers’ average age48.2 yrs
Drivers’ average income$73,662

The vast majority of driving in O'Brien County, Iowa happens on local roads: 88% of all vehicle-miles. A typical local road sees 1,328 vehicles per day.

Their share of road miles is similar, 94% (285 miles in 2,606 segments), carrying 281,718 vehicle-miles traveled per day (≈103 million per year). Trucks make up 8.3% of non-highway traffic, about 1 in 12 vehicles.

Younger drivers than 71% of counties in Iowa

Non-highway roads carry a truck concentration that's 40% lower than the highway network.

The non-highway congestion ratio of 6.8% is 39% lower than the state level, suggesting more efficient local mobility than the state average.

O'Brien's average driver income is higher than 57% of counties in Iowa. The driver population here skews younger than 71% 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 75% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 33% 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 +17% 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 O'Brien County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +17% in high season.

O'Brien County vs. Iowa Traffic Comparison

O'Brien County's biggest difference from the Iowa average is its average daily traffic per road, 56% below it. Its truck share is also 19% below.

MetricO'Brien CountyIowa averageDifference
Traffic1,3463,042-55.7%
Truck % (Total Traffic)8.9%11.0%-18.9%
Truck % (Highway)13.9%16.1%-13.7%
Avg. Travel Time37.8 min33.0 min+14.6%

How O'Brien County compares

O'Brien County against nearby counties

Nothing in this table sets O'Brien County sharply apart from the 4 areas nearest to it, though it has the third busiest roads of the five.

O'Brien 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
O'Brien County1,3468.9%318,71637.8 min6.8%
Osceola County, Iowa1,16011.1%262,85043.5 min5.3%
Clay County, Iowa1,8339.1%380,53635.3 min6.9%
Cherokee County, Iowa1,2779.2%269,72539.5 min5.9%
Sioux County, Iowa2,4289.1%808,31931.7 min9.7%
Iowa average3,04211.0%N/A33.0 min11.4%

O'Brien County ranked within Iowa

O'Brien County records the lowest highway travel volume and highway truck volume in Iowa.

O'Brien County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureO'Brien CountyIowa rank
Traffic volume (AADT)1,346#72 of 99
Highway vehicle-miles per day36,998#70 of 70
Truck share on highways13.9%#40 of 70
Highway trucks per day294#70 of 70
Average travel time37.8 min#14 of 99
Average driver income$74,177#43 of 99
Average driver age48.2 yrs#70 of 99

The two ends of this table sit far apart: #14 of 99 on average travel time, against #70 of 70 on highway travel volume.

Busiest roads in O'Brien County, Iowa

Traffic concentrates on a few corridors: the three busiest roads average 5,844 vehicles a day, against 1,346 on the average road in O'Brien County.

Park Street leads with 7,939 vehicles a day, 363 of them trucks (4.6%). That is 62% more than the next road, US-18 (4,914). IA 60 carries the most trucks, 569 a day (12.6% of its traffic), although it ranks #4 for all traffic.

Trips using IA 60 are long: a median of 51.5 minutes against 37.8 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Park StreetPrimary road · 7,939vehicles363trucks · 4.6%
Road class
Primary road
Congestion ratio
21.8%
Median trip time
38.8 min
Drivers’ median age
46.8 yrs
Drivers’ average income
$73,229

Delays build on Park Street: its congestion ratio of 22% over free-flow time is well above the county's 7%.

2US-18Primary road · 4,914vehicles357trucks · 7.3%
Road class
Primary road
Congestion ratio
14.4%
Median trip time
32.8 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$63,402

On its busiest stretch, US-18 carries 3.7 times the county average; trucks are 7.3% of it, below the county-wide 8.9%.

3320th StreetPrimary road · 4,677vehicles380trucks · 8.1%
Road class
Primary road
Congestion ratio
12.7%
Median trip time
35.0 min
Drivers’ median age
47.8 yrs
Drivers’ average income
$71,771

320th Street peaks at 4,677 vehicles a day, 3.5 times the county average; trucks are 8.1% of it, below the county-wide 8.9%.

4IA 60Trunk road · 4,509vehicles569trucks · 12.6%
Road class
Trunk road
Congestion ratio
5.1%
Median trip time
51.5 min
Drivers’ median age
48.3 yrs
Drivers’ average income
$81,853

IA 60 carries 3.4 times the county average at its busiest, 569 of them trucks (12.6%, above the county-wide 8.9%).

52nd AvenuePrimary road · 3,839vehicles257trucks · 6.7%
Road class
Primary road
Congestion ratio
9.3%
Median trip time
32.6 min
Drivers’ median age
46.7 yrs
Drivers’ average income
$69,242

2nd Avenue carries 2.9 times the county average on its busiest stretch, where the median trip lasts 32.6 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1IA 60Trunk road · #4 by traffic4,509vehicles569trucks · 12.6%
2320th StreetPrimary road · #3 by traffic4,677vehicles380trucks · 8.1%
3Park StreetPrimary road · #1 by traffic7,939vehicles363trucks · 4.6%
4US-18Primary road · #2 by traffic4,914vehicles357trucks · 7.3%
52nd AvenuePrimary road · #5 by traffic3,839vehicles257trucks · 6.7%
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

O'BrienDepartment 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 O'Brien County

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

Need segment-level traffic data?

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