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Traffic heat map of Marion County, Ohio: 358 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 23 and Mt Vernon Avenue

Marion County, Ohio Traffic Counts

TrafficZoom tracks traffic on 358 road miles in Marion County, Ohio, divided into 3,547 segments averaging 533 ft. Trips here are the longest of any county in Ohio, a median 43.6 minutes. 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 Marion County, Ohio

Traffic

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

vehicles per day4,615
Trucks

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

10.9%
Average travel time

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

43.6 min
Congestion ratio

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

14.3%
Drivers’ average age

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

48.5 yrs
Drivers’ average income

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

$68,188

The average monitored road in Marion County, Ohio carries 4,615 vehicles per day. Across its 358 miles of monitored roads, that adds up to 1,288,102 vehicle-miles traveled per day (≈470 million per year). About 1 in 9 vehicles is a truck, in line with Ohio (9.9%).

The longest trips of any county in Ohio

Marion's average daily traffic volume is 20% lower than the state average - 4,615 vehicles per day against 5,773 - suggesting less traffic load per road - a critical factor for logistics and site planning. In total volume terms, its road network carries about 0.5% of Ohio's statewide total of vehicle-miles. 77% of counties in Ohio see less traffic than Marion's 4,615 vehicles per day.

The average trip takes 43.6 minutes, 33% higher than the state level. At 43.6 minutes, Marion also has the highest average travel time in Ohio.

The congestion ratio of 14.3% runs slightly lower than the state level (13% lower) - relevant for traffic control and delivery planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Marion County, Ohio

Trafficvehicles per day10,688
Trucks18.9%
Average travel time60.5 min
Congestion ratio23.4%
Drivers’ average age47.6 yrs
Drivers’ average income$84,406

A significant share of driving in Marion County, Ohio, 34% of vehicle-miles, happens on highways. The average highway carries 10,688 vehicles per day, 141% more than the average non-highway road in the same area, which carries 4,430 vehicles per day.

Yet highways are only 11% of the road network, 40 miles in 105 segments, so each mile of them is 3.1 times as busy as the average road mile.

Freight-heavy highways

The concentration of trucks on highways (18.9%) is 27% higher than the state average for similar road classifications. Highways here lean toward freight, so highway access is a real asset for logistics operators.

57% of counties in Ohio see a lower highway truck share than Marion's 18.9%. By raw truck volume, Marion carries more highway trucks than 56% of counties in Ohio.

non-highway traffic icon

Non-highway Traffic in Marion County, Ohio

Trafficvehicles per day4,430
Trucks6.7%
Average travel time43.1 min
Congestion ratio14.0%
Drivers’ average age48.6 yrs
Drivers’ average income$65,082

A little more than half of the driving in Marion County, Ohio happens on local roads: 66% of all vehicle-miles. On the average non-highway road, that comes to 4,430 vehicles per day.

Spread over 318 miles and 3,442 segments, 89% of the road network, local roads carry a lighter load per mile: 845,284 vehicle-miles traveled per day (≈309 million per year). Trucks make up 6.7% of non-highway traffic, about 1 in 15 vehicles.

Local roads carry 64% fewer trucks by share than highways

Compared to highways, non-highway routes see 64% fewer trucks by share.

Non-highway congestion (14.0%) runs slightly lower than the state level (12% lower).

60% of counties in Ohio see higher average driver income among trip origins than Marion. The driver population here skews younger than 63% of counties in Ohio.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Marion County vs. Ohio Traffic Comparison

The average travel time sets Marion County apart: 33% above the Ohio average. Its highway truck share is also 27% above.

MetricMarion CountyOhio averageDifference
Traffic4,6155,773-20.1%
Truck % (Total Traffic)10.9%9.9%+10.1%
Truck % (Highway)18.9%14.9%+27.1%
Avg. Travel Time43.6 min32.9 min+32.8%

How Marion County compares

Trips in Marion County run longer than in any nearby county

Set against the average of the 4 areas nearest to it, Marion County sees 35.8% longer typical trips; it has the second busiest roads of the five.

Marion 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
Marion County4,61510.9%1,288,10243.6 min14.3%
Union County, Ohio3,37610.6%1,998,33530.3 min10.4%
Wyandot County, Ohio2,43919.6%997,62333.7 min8.0%
Delaware County, Ohio6,2698.3%5,148,49829.3 min16.9%
Morrow County, Ohio3,26916.7%1,578,59335.2 min10.2%
Ohio average5,7739.9%N/A32.9 min16.5%

Marion County ranked within Ohio

No other county-level area in Ohio records a higher average travel time than Marion County.

Marion County ranked among 88 county-level areas in Ohio (1 = highest); measures without data in every county rank a smaller field, down to 83.
MeasureMarion CountyOhio rank
Traffic volume (AADT)4,615#21 of 88
Highway vehicle-miles per day442,818#58 of 83
Truck share on highways18.9%#36 of 83
Highway trucks per day2,022#37 of 83
Average travel time43.6 min#1 of 88
Average driver income$68,188#53 of 88
Average driver age48.5 yrs#56 of 88

Busiest roads in Marion County, Ohio

On their busiest stretches, the three busiest roads in Marion County carry 19,628 vehicles a day on average, 4.3 times the typical road in the county (4,615).

US 23 is the busiest road, at 26,273 vehicles a day, 3,400 of them trucks (12.9%). It tops the truck ranking too, with the most trucks.

Few trucks use Delaware Avenue: 3.7% of its traffic, under half the county's 10.9%.

US 23 draws drivers from wealthier areas: their neighborhoods average $88,898 in household income, 30% above the county's $68,188, while those on Main Street average $48,810, 28% below it.

Traffic and freight follow different roads here: only 2 of the five busiest roads also make the top 5 for trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 23Trunk road · 26,273vehicles3,400trucks · 12.9%
Road class
Trunk road
Congestion ratio
28.4%
Median trip time
58.8 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$88,898

US 23 carries through traffic: the median trip using it lasts 58.8 minutes, against 43.6 for the county.

2Mt Vernon AvenuePrimary road · 18,220vehicles824trucks · 4.5%
Road class
Primary road
Congestion ratio
25.9%
Median trip time
45.6 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$63,130

The busiest stretch of Mt Vernon Avenue carries 3.9 times the county average; trucks are 4.5% of it, below the county-wide 10.9%.

3Delaware AvenueSecondary road · 14,392vehicles533trucks · 3.7%
Road class
Secondary road
Congestion ratio
34.2%
Median trip time
34.0 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$58,555

Travel on Delaware Avenue's busiest stretch runs 34% over free-flow time, against 14% across the county, so expect slower peak hours.

4Main StreetTertiary road · 10,771vehicles376trucks · 3.5%
Road class
Tertiary road
Congestion ratio
26.8%
Median trip time
56.3 min
Drivers’ median age
48.4 yrs
Drivers’ average income
$48,810

On its busiest stretch, Main Street carries 2.3 times the county average; trucks are 3.5% of it, below the county-wide 10.9%.

5Center StreetPrimary road · 10,056vehicles526trucks · 5.2%
Road class
Primary road
Congestion ratio
28.5%
Median trip time
51.0 min
Drivers’ median age
48.5 yrs
Drivers’ average income
$54,513

Center Street is one of the more congested roads here: trips take 29% longer than at free-flow speed, against 14% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 23Trunk road · #1 by traffic26,273vehicles3,400trucks · 12.9%
2Mt Vernon AvenuePrimary road · #2 by traffic18,220vehicles824trucks · 4.5%
3Harding HighwayPrimary road · 7,092vehicles701trucks · 9.9%
Road class
Primary road
Congestion ratio
19.1%
Median trip time
35.5 min
Drivers’ median age
49.3 yrs
Drivers’ average income
$63,815

At 54% more than the county average, Harding Highway draws drivers from neighborhoods averaging $63,815 in household income.

4Marion-Mt Gilead RoadPrimary road · 9,008vehicles625trucks · 6.9%
Road class
Primary road
Congestion ratio
23.9%
Median trip time
38.7 min
Drivers’ median age
49.1 yrs
Drivers’ average income
$72,835

Marion-Mt Gilead Road peaks at 9,008 vehicles a day, 2.0 times the county average; trucks are 6.9% of it, below the county-wide 10.9%.

5SR 309Primary road · 5,176vehicles536trucks · 10.3%
Road class
Primary road
Congestion ratio
12.7%
Median trip time
38.6 min
Drivers’ median age
50.1 yrs
Drivers’ average income
$64,473

SR 309 is busy by local standards, at 12% more than the county average on its busiest stretch; trucks are 10.3% of it, below the county-wide 10.9%.

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

MarionDepartment 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 Marion County

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

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