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Traffic heat map of Darke County, Ohio: 537 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Martin Street and South Broadway

Darke County, Ohio Traffic Counts

How busy are the roads of Darke County, Ohio? We measure 537 road miles, divided into 8,784 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, Martin Street, carries 18,606 vehicles a day, 7.8 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 Volume & Performance in Darke County, Ohio

Traffic

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

vehicles per day2,371
Trucks

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

8.3%
Average travel time

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

36.2 min
Congestion ratio

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

7.9%
Drivers’ average age

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

50.6 yrs
Drivers’ average income

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

$64,872

Our data shows 2,371 vehicles per day on the average road in Darke County, Ohio, and 987,464 vehicle-miles traveled per day (≈360 million per year) across its 537 miles of monitored roads. Trucks are a smaller part of the mix than across Ohio: 8.3% against 9.9%.

Longer trips than 85% of counties in Ohio

Darke sees 59% lower average daily traffic volume than the state average (2,371 vehicles per day against 5,773), 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 0.4% of Ohio's statewide total. By volume, Darke's 2,371 vehicles per day trails 75% of counties in Ohio.

Journey times run 10% higher than the state level, at 36.2 minutes on average. On travel time, Darke runs longer than 85% of counties in Ohio.

The congestion ratio of 7.9% is 52% lower, pointing to smoother traffic flow than the state level - free-flowing roads make scheduled deliveries highly predictable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Darke County, Ohio

Trafficvehicles per day5,497
Trucks11.2%
Average travel time38.8 min
Congestion ratio13.3%
Drivers’ average age50.8 yrs
Drivers’ average income$67,116

At 29% of vehicle-miles, highways carry a smaller share of the traffic in Darke County, Ohio than local roads. The average highway carries 5,497 vehicles per day, 154% more than the average non-highway road in the same area, which carries 2,161 vehicles per day.

Highways make up 10% of the monitored road miles (54 miles, 552 segments), so they carry more than their share: 284,052 vehicle-miles traveled per day (≈104 million per year).

Fewer highway trucks than 90% of counties in Ohio

The concentration of trucks on highways (11.2%) is 25% lower than the state average for similar road classifications. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

Darke's highway truck share (11.2%) is lower than 77% of counties in Ohio. By raw truck volume, Darke carries fewer highway trucks than 90% of counties in Ohio.

non-highway traffic icon

Non-highway Traffic in Darke County, Ohio

Trafficvehicles per day2,161
Trucks7.1%
Average travel time36.1 min
Congestion ratio7.6%
Drivers’ average age50.5 yrs
Drivers’ average income$64,236

Most travel in Darke County, Ohio happens on local roads, 71% of all vehicle-miles. The average non-highway road carries 2,161 vehicles per day.

Local roads make up 90% of the monitored road miles (483 miles in 8,232 segments) but carry less than their share of travel: 703,412 vehicle-miles traveled per day (≈257 million per year). The truck share on non-highway roads is 7.1%.

Older drivers than 78% of counties in Ohio

The concentration of trucks on non-highway roads is 37% lower than on highways.

Non-highway congestion (7.6%) runs 52% lower than the state average, pointing to smoother local traffic flow.

Darke's average driver income is lower than 76% of counties in Ohio. 78% of counties in Ohio have a younger driver population than Darke.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Darke County, Ohio, the peak hour concentrates about 7% of the day's traffic.

Darke County vs. Ohio Traffic Comparison

Of the four measures, average daily traffic per road differs most: Darke County runs 59% below the Ohio average. Its highway truck share is also 25% below.

MetricDarke CountyOhio averageDifference
Traffic2,3715,773-58.9%
Truck % (Total Traffic)8.3%9.9%-16.5%
Truck % (Highway)11.2%14.9%-24.8%
Avg. Travel Time36.2 min32.9 min+10.3%

How Darke County compares

Darke County has the lowest truck share of its nearby counties

Set against the average of the 4 areas nearest to it, Darke County runs 6.3 percentage points less truck traffic; it has the third busiest roads of the five. The same kind of road, just less of it: traffic per road matches the areas around it while the network itself is smaller.

Darke County and the 4 nearest county-level areas by centroid distance, with the Ohio average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Darke County2,3718.3%987,46436.2 min7.9%
Randolph County, Indiana2,2419.4%388,22833.0 min7.6%
Preble County, Ohio2,26819.0%1,309,94332.1 min7.6%
Miami County, Ohio3,73611.6%2,543,51234.8 min12.7%
Shelby County, Ohio2,74618.2%1,687,73630.7 min10.1%
Ohio average5,7739.9%N/A32.9 min16.5%

Darke County ranked within Ohio

Highway truck volume places Darke County #75 of 83 in Ohio - the bottom quarter of the state.

Darke County ranked among 88 county-level areas in Ohio (1 = highest); measures without data in every county rank a smaller field, down to 83.
MeasureDarke CountyOhio rank
Traffic volume (AADT)2,371#66 of 88
Highway vehicle-miles per day284,052#72 of 83
Truck share on highways11.2%#64 of 83
Highway trucks per day616#75 of 83
Average travel time36.2 min#14 of 88
Average driver income$64,872#67 of 88
Average driver age50.6 yrs#20 of 88

The two ends of this table sit far apart: #14 of 88 on average travel time, against #75 of 83 on highway truck volume.

Busiest roads in Darke County, Ohio

On their busiest stretches, the three busiest roads in Darke County carry 15,640 vehicles a day on average, 6.6 times the typical road in the county (2,371).

Martin Street leads with 18,606 vehicles a day, 1,266 of them trucks (6.8%). It also carries the most trucks.

Martin Street carries longer journeys than most roads here, with a median trip of 47.1 minutes against 36.2 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Martin StreetPrimary road · 18,606vehicles1,266trucks · 6.8%
Road class
Primary road
Congestion ratio
30.0%
Median trip time
47.1 min
Drivers’ median age
50.5 yrs
Drivers’ average income
$52,033

Martin Street is one of the more congested roads here: trips take 30% longer than at free-flow speed, against 8% county-wide.

2South BroadwayPrimary road · 17,869vehicles1,230trucks · 6.9%
Road class
Primary road
Congestion ratio
40.1%
Median trip time
41.4 min
Drivers’ median age
50.0 yrs
Drivers’ average income
$55,285

Delays build on South Broadway: its congestion ratio of 40% over free-flow time is well above the county's 8%.

3SR 571Primary road · 10,447vehicles775trucks · 7.4%
Road class
Primary road
Congestion ratio
24.9%
Median trip time
43.2 min
Drivers’ median age
49.8 yrs
Drivers’ average income
$53,305

SR 571 peaks at 10,447 vehicles a day, 4.4 times the county average; trucks are 7.4% of it, below the county-wide 8.3%.

4US 36Primary road · 10,095vehicles737trucks · 7.3%
Road class
Primary road
Congestion ratio
23.3%
Median trip time
43.4 min
Drivers’ median age
50.6 yrs
Drivers’ average income
$53,914

US 36 carries 4.3 times the county average at its busiest, 737 of them trucks (7.3%, below the county-wide 8.3%).

5Main StreetSecondary road · 8,946vehicles397trucks · 4.4%
Road class
Secondary road
Congestion ratio
27.0%
Median trip time
35.0 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$54,022

Main Street carries 3.8 times the county average on its busiest stretch, where the median trip lasts 35.0 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Martin StreetPrimary road · #1 by traffic18,606vehicles1,266trucks · 6.8%
2South BroadwayPrimary road · #2 by traffic17,869vehicles1,230trucks · 6.9%
3SR 49Trunk road · 7,688vehicles790trucks · 10.3%
Road class
Trunk road
Congestion ratio
18.0%
Median trip time
38.3 min
Drivers’ median age
50.7 yrs
Drivers’ average income
$63,210

At 3.2 times the county average, SR 49 draws drivers from neighborhoods averaging $63,210 in household income.

4SR 571Primary road · #3 by traffic10,447vehicles775trucks · 7.4%
5US 36Primary road · #4 by traffic10,095vehicles737trucks · 7.3%
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

DarkeDepartment 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 Darke County

The same traffic breakdown for the areas closest to Darke County, Ohio.

Need segment-level traffic data?

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