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Traffic heat map of Union County, Iowa: 148 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Sumner Avenue and Taylor Street

Union County, Iowa Traffic Counts

TrafficZoom tracks traffic on 148 road miles in Union County, Iowa, divided into 1,981 segments averaging 396 ft. Its busiest road, Sumner Avenue, carries 9,386 vehicles a day, 3.7 times the average road. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Union County, Iowa

Traffic

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

vehicles per day2,528
Trucks

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

7.6%
Average travel time

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

31.5 min
Congestion ratio

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

4.8%
Drivers’ average age

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

50.1 yrs
Drivers’ average income

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

$66,022

A typical monitored road in Union County, Iowa sees 2,528 vehicles per day, while its 148 miles of monitored roads together handle 249,515 vehicle-miles traveled per day (≈91.1 million per year). About 1 in 13 vehicles is a truck, fewer than the 1 in 9 across Iowa.

Busier roads than 82% of counties in Iowa

At 2,528 vehicles per day, the average monitored road in Union carries 17% less traffic than the state average of 3,042, suggesting less demand on each road - a factor worth weighing in site selection and logistics planning. In total volume terms, its road network carries about 0.3% of Iowa's statewide total of vehicle-miles. By volume, Union's 2,528 vehicles per day outpaces 82% of counties in Iowa.

The average trip takes 31.5 minutes, on par with the state level. Its average travel time of 31.5 minutes is shorter than 79% of counties in Iowa.

At 58% lower than the state level, the 4.8% congestion ratio signals smoother traffic flow - free-flowing roads make scheduled deliveries highly predictable.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–9:00 AM 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 somewhat quieter: volumes run about 6% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +24% versus the annual average.
Lowest month:
February is the quietest month, with volumes -21% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Union County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +24% in high season.

Union County vs. Iowa Traffic Comparison

Of the four measures, truck share differs most: Union County runs 31% below the Iowa average. Its average daily traffic per road is also 17% below.

MetricUnion CountyIowa averageDifference
Traffic2,5283,042-16.9%
Truck % (Total Traffic)7.6%11.0%-30.8%
Avg. Travel Time31.5 min33.0 min-4.7%

How Union County compares

Union County has the lowest truck share of its nearby counties

Compared with its 4 closest neighbours, Union County runs 8.4 percentage points less truck traffic and carries 59.9% more traffic on a typical road; it has the second busiest roads of the five. The extra traffic here is local and light - trucks make up less of it than anywhere immediately around it.

Union 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
Union County2,5287.6%249,51531.5 min4.8%
Ringgold County, Iowa94310.0%93,70728.9 minN/A
Adams County, Iowa9829.5%108,62938.9 minN/A
Clarke County, Iowa2,58719.7%494,89232.6 min4.0%
Adair County, Iowa1,81024.8%694,62035.6 minN/A
Iowa average3,04211.0%N/A33.0 min11.4%

Union County ranked within Iowa

Average driver income places Union County #85 of 99 in Iowa - the bottom quarter of the state.

Union County ranked among 99 county-level areas in Iowa (1 = highest).
MeasureUnion CountyIowa rank
Traffic volume (AADT)2,528#19 of 99
Average travel time31.5 min#78 of 99
Average driver income$66,022#85 of 99
Average driver age50.1 yrs#53 of 99

The two ends of this table sit far apart: #19 of 99 on average daily traffic volume, against #85 of 99 on average driver income.

Busiest roads in Union County, Iowa

The three busiest roads in Union County average 7,741 vehicles a day, 3.1 times the county average of 2,528 across all its monitored roads.

Sumner Avenue leads with 9,386 vehicles a day, 378 of them trucks (4.0%). US 34 carries the most trucks, 417 a day (8.2% of its traffic), although it ranks #5 for all traffic.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Sumner AvenuePrimary road · 9,386vehicles378trucks · 4.0%
Road class
Primary road
Median trip time
30.6 min
Drivers’ median age
50.9 yrs
Drivers’ average income
$63,147

At 3.7 times the county average, Sumner Avenue draws drivers from neighborhoods averaging $63,147 in household income.

2Taylor StreetPrimary road · 8,180vehicles403trucks · 4.9%
Road class
Primary road
Median trip time
32.3 min
Drivers’ median age
51.3 yrs
Drivers’ average income
$60,860

The busiest stretch of Taylor Street carries 3.2 times the county average; trucks are 4.9% of it, below the county-wide 7.6%.

3New York AvenuePrimary road · 5,657vehicles321trucks · 5.7%
Road class
Primary road
Median trip time
31.4 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$61,882

On its busiest stretch, New York Avenue carries 2.2 times the county average; trucks are 5.7% of it, below the county-wide 7.6%.

4Townline StreetTertiary road · 5,395vehicles142trucks · 2.6%
Road class
Tertiary road
Median trip time
35.6 min
Drivers’ median age
46.4 yrs
Drivers’ average income
$67,008

Townline Street peaks at 5,395 vehicles a day, 2.1 times the county average; trucks are 2.6% of it, below the county-wide 7.6%.

5US 34Primary road · 5,059vehicles417trucks · 8.2%
Road class
Primary road
Median trip time
34.3 min
Drivers’ median age
49.8 yrs
Drivers’ average income
$64,295

US 34 carries 2.0 times the county average at its busiest, 417 of them trucks (8.2%, above the county-wide 7.6%).

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 34Primary road · #5 by traffic5,059vehicles417trucks · 8.2%
2Taylor StreetPrimary road · #2 by traffic8,180vehicles403trucks · 4.9%
3Sumner AvenuePrimary road · #1 by traffic9,386vehicles378trucks · 4.0%
4New York AvenuePrimary road · #3 by traffic5,657vehicles321trucks · 5.7%
5Douglas StreetPrimary road · 4,000vehicles302trucks · 7.6%
Road class
Primary road
Median trip time
28.3 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$65,008

Douglas Street is busy by local standards, at 58% more than the county average on its busiest stretch; trucks are 7.6% of it, in line with the county-wide 7.6%.

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

UnionDepartment 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 Union County

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

Need segment-level traffic data?

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