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Traffic heat map of Delaware County, Iowa: 366 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 20 and Franklin Street

Delaware County, Iowa Traffic Counts

TrafficZoom tracks traffic on 366 road miles in Delaware County, Iowa, divided into 2,910 segments averaging 664 ft. Its busiest road, US 20, carries 13,442 vehicles a day, 9.0 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 icon

Total Traffic Volume & Performance in Delaware County, Iowa

Traffic

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

vehicles per day1,486
Trucks

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

11.3%
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.

6.9%
Drivers’ average age

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

51.4 yrs
Drivers’ average income

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

$80,113

The average monitored road in Delaware County, Iowa carries 1,486 vehicles per day. Across its 366 miles of monitored roads, that adds up to 611,003 vehicle-miles traveled per day (≈223 million per year). Trucks are 11.3% of traffic, close to the 11.0% across Iowa.

Shorter trips than 78% of counties in Iowa

At 1,486 vehicles per day, the average monitored road in Delaware carries 51% less traffic than the state average of 3,042, suggesting less demand on each road - very light roads: easy truck access, but little passing trade for roadside retail. Across the whole network, that travel is about 0.7% of Iowa's statewide total. 58% of counties in Iowa see more traffic than Delaware's 1,486 vehicles per day.

At 31.5 minutes, the average travel time matches the state level closely. Its average travel time of 31.5 minutes is shorter than 78% of counties in Iowa.

The congestion ratio of 6.9% is 39% lower, pointing to smoother traffic flow than the state level - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Delaware County, Iowa

Trafficvehicles per day4,893
Trucks14.1%
Average travel time47.5 min
Congestion ratio11.4%
Drivers’ average age50.4 yrs
Drivers’ average income$82,820

Highways carry about half of all travel in Delaware County, Iowa, 52% of vehicle-miles. The average highway carries 4,893 vehicles per day, 263% more than the average non-highway road in the same area, which carries 1,348 vehicles per day.

Highways make up 18% of the monitored road miles (64 miles, 113 segments), so they carry more than their share: 316,708 vehicle-miles traveled per day (≈116 million per year).

A typical mix of freight and passenger traffic

Highway truck concentration here runs 12% lower than the state average, at 14.1%. The highway traffic mix is typical for Iowa: neither freight- nor commuter-dominated.

Delaware's highway truck share (14.1%) is lower than 52% of counties in Iowa. By raw truck volume, Delaware carries fewer highway trucks than 54% of counties in Iowa.

non-highway traffic icon

Non-highway Traffic in Delaware County, Iowa

Trafficvehicles per day1,348
Trucks8.3%
Average travel time30.9 min
Congestion ratio6.8%
Drivers’ average age51.9 yrs
Drivers’ average income$78,292

Local roads carry about half of all travel in Delaware County, Iowa, 48% of vehicle-miles. On the average non-highway road, that comes to 1,348 vehicles per day.

Local roads make up 82% of the monitored road miles (301 miles in 2,797 segments) but carry less than their share of travel: 294,294 vehicle-miles traveled per day (≈107 million per year). Trucks make up 8.3% of non-highway traffic, about 1 in 12 vehicles.

Drivers from higher-income areas than 80% of counties in Iowa

Compared to highways, non-highway routes see 41% fewer trucks by share.

At 39% lower than the state level, the non-highway congestion ratio of 6.8% signals easier movement on local roads.

Delaware's average driver income is higher than 80% of counties in Iowa. 69% of counties in Iowa have a younger driver population than Delaware.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 73% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 11% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +20% versus the annual average.
Lowest month:
February is the quietest month, with volumes -24% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Delaware County, Iowa, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +20% in high season.

Delaware County vs. Iowa Traffic Comparison

The average daily traffic per road sets Delaware County apart: 51% below the Iowa average.

MetricDelaware CountyIowa averageDifference
Traffic1,4863,042-51.1%
Truck % (Total Traffic)11.3%11.0%+2.9%
Truck % (Highway)14.1%16.1%-12.3%
Avg. Travel Time31.5 min33.0 min-4.5%

How Delaware County compares

Delaware County against nearby counties

Against the 4 nearest areas, Delaware County carries 35.1% less traffic on a typical road and is 26.3% less congested; 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.

Delaware 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
Delaware County1,48611.3%611,00331.5 min6.9%
Clayton County, Iowa1,3509.2%421,97037.6 min6.8%
Jones County, Iowa1,7529.6%559,71233.2 min6.9%
Dubuque County, Iowa3,7919.5%1,911,04632.1 min14.8%
Buchanan County, Iowa2,25911.5%938,19333.5 min9.1%
Iowa average3,04211.0%N/A33.0 min11.4%

Delaware County ranked within Iowa

Average driver income places Delaware County #21 of 99 in Iowa - the top quarter of the state.

Delaware County ranked among 99 county-level areas in Iowa (1 = highest); measures without data in every county rank a smaller field, down to 70.
MeasureDelaware CountyIowa rank
Traffic volume (AADT)1,486#58 of 99
Highway vehicle-miles per day316,708#39 of 70
Truck share on highways14.1%#37 of 70
Highway trucks per day691#38 of 70
Average travel time31.5 min#77 of 99
Average driver income$80,113#21 of 99
Average driver age51.4 yrs#31 of 99

Busiest roads in Delaware County, Iowa

The three busiest roads in Delaware County average 9,807 vehicles a day, 6.6 times the county average of 1,486 across all its monitored roads.

US 20 leads with 13,442 vehicles a day, 2,086 of them trucks (15.5%). No other road comes close: Franklin Street, in second place, carries 8,294. It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 20Motorway · 13,442vehicles2,086trucks · 15.5%
Road class
Motorway
Congestion ratio
15.0%
Median trip time
40.7 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$81,305

A main artery: US 20's busiest stretch carries 9.0 times the county average; trucks are 15.5% of it, above the county-wide 11.3%.

2Franklin StreetPrimary road · 8,294vehicles597trucks · 7.2%
Road class
Primary road
Congestion ratio
24.5%
Median trip time
31.8 min
Drivers’ median age
51.3 yrs
Drivers’ average income
$69,143

Delays build on Franklin Street: its congestion ratio of 25% over free-flow time is well above the county's 7%.

3Main StreetPrimary road · 7,686vehicles565trucks · 7.3%
Road class
Primary road
Congestion ratio
23.1%
Median trip time
28.9 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$73,673

Travel on Main Street's busiest stretch runs 23% over free-flow time, against 7% across the county, so expect slower peak hours.

4IA 13Primary road · 5,897vehicles545trucks · 9.2%
Road class
Primary road
Congestion ratio
14.3%
Median trip time
38.1 min
Drivers’ median age
51.2 yrs
Drivers’ average income
$80,338

At 4.0 times the county average, IA 13 draws drivers from neighborhoods averaging $80,338 in household income.

5Bailey DriveSecondary road · 3,848vehicles217trucks · 5.6%
Road class
Secondary road
Congestion ratio
8.8%
Median trip time
31.1 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$78,246

The busiest stretch of Bailey Drive carries 2.6 times the county average; trucks are 5.6% of it, below the county-wide 11.3%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 20Motorway · #1 by traffic13,442vehicles2,086trucks · 15.5%
2Franklin StreetPrimary road · #2 by traffic8,294vehicles597trucks · 7.2%
3Main StreetPrimary road · #3 by traffic7,686vehicles565trucks · 7.3%
4IA 13Primary road · #4 by traffic5,897vehicles545trucks · 9.2%
5Union StreetPrimary road · 3,418vehicles400trucks · 11.7%
Road class
Primary road
Congestion ratio
7.9%
Median trip time
35.1 min
Drivers’ median age
52.1 yrs
Drivers’ average income
$72,948

On its busiest stretch, Union Street carries 2.3 times the county average; trucks are 11.7% of it, in line with the county-wide 11.3%.

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

DelawareDepartment 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 Delaware County

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

Need segment-level traffic data?

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