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Traffic heat map of Mercer County, Ohio: 283 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Market Street and SR 29

Mercer County, Ohio Traffic Counts

TrafficZoom tracks traffic on 283 road miles in Mercer County, Ohio, divided into 3,297 segments averaging 453 ft. Its busiest road, Market Street, carries 13,518 vehicles a day, 4.1 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 Mercer County, Ohio

Traffic

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

vehicles per day3,270
Trucks

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

10.2%
Average travel time

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

33.4 min
Congestion ratio

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

9.3%
Drivers’ average age

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

49.1 yrs
Drivers’ average income

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

$80,887

The average monitored road in Mercer County, Ohio carries 3,270 vehicles per day. Across its 283 miles of monitored roads, that adds up to 803,661 vehicle-miles traveled per day (≈293 million per year). About 1 in 10 vehicles is a truck, in line with Ohio (9.9%).

Congestion 43% below the Ohio average

Mercer's average daily traffic volume is 43% lower than the state average - 3,270 vehicles per day against 5,773 - suggesting less traffic load per road - less drive-by exposure for retail, but easier access for deliveries. Across the whole network, that travel is about 0.3% of Ohio's statewide total. Mercer carries less traffic than 51% of counties in Ohio.

Journey times here (33.4 minutes on average) closely track the state level. Its average travel time of 33.4 minutes is longer than 51% of counties in Ohio.

At 43% lower than the state level, the 9.3% congestion ratio signals smoother traffic flow - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Mercer County, Ohio

Trafficvehicles per day6,295
Trucks11.9%
Average travel time34.8 min
Congestion ratio15.9%
Drivers’ average age49.1 yrs
Drivers’ average income$78,241

Highways carry a significant share of travel in Mercer County, Ohio: 36% of all vehicle-miles. The average highway carries 6,295 vehicles per day, 130% more than the average non-highway road in the same area, which carries 2,740 vehicles per day.

With 18% of the road miles (51 miles in 492 segments), highways punch above their length, carrying 289,222 vehicle-miles traveled per day (≈106 million per year).

Fewer highway trucks than 84% of counties in Ohio

The concentration of trucks on highways (11.9%) is 20% 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.

73% of counties in Ohio see a higher highway truck share than Mercer's 11.9%. 84% of counties in Ohio see more highway trucks per day than Mercer's roughly 750.

non-highway traffic icon

Non-highway Traffic in Mercer County, Ohio

Trafficvehicles per day2,740
Trucks9.2%
Average travel time33.2 min
Congestion ratio8.1%
Drivers’ average age49.0 yrs
Drivers’ average income$82,514

A little more than half of the driving in Mercer County, Ohio happens on local roads: 64% of all vehicle-miles. The average non-highway road carries 2,740 vehicles per day.

Spread over 232 miles and 2,805 segments, 82% of the road network, local roads carry a lighter load per mile: 514,440 vehicle-miles traveled per day (≈188 million per year). Trucks make up 9.2% of non-highway traffic, about 1 in 11 vehicles.

Drivers from higher-income areas than 76% of counties in Ohio

Non-highway roads carry a truck concentration that's 23% lower than the highway network.

Non-highway congestion (8.1%) runs 49% lower than the state average, pointing to smoother local traffic flow.

Mercer's average driver income is higher than 76% of counties in Ohio. The driver population here skews younger than 52% of counties in Ohio.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 10:00 AM–12:00 PM and PM peak 3:00 PM–6:00 PM, with volumes reaching approximately 68% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 15% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
August–October is the high season, with volumes +10% 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 Mercer County, Ohio, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +10% in high season.

Mercer County vs. Ohio Traffic Comparison

Of the four measures, average daily traffic per road differs most: Mercer County runs 43% below the Ohio average. Its highway truck share is also 20% below.

MetricMercer CountyOhio averageDifference
Traffic3,2705,773-43.4%
Truck % (Total Traffic)10.2%9.9%+2.4%
Truck % (Highway)11.9%14.9%-20.0%
Avg. Travel Time33.4 min32.9 min+1.7%

How Mercer County compares

Mercer County against nearby counties

Nothing in this table sets Mercer County sharply apart from the 4 areas nearest to it, though it has the second busiest roads of the five.

Mercer 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
Mercer County3,27010.2%803,66133.4 min9.3%
Van Wert County, Ohio2,58313.9%787,47737.6 min8.7%
Jay County, Indiana2,62610.6%338,55337.5 min7.4%
Auglaize County, Ohio2,58614.8%1,429,90432.0 min8.9%
Adams County, Indiana4,2648.1%500,21833.8 min11.7%
Ohio average5,7739.9%N/A32.9 min16.5%

Mercer County ranked within Ohio

Mercer County sits in the bottom quarter of the Ohio field on highway truck volume, at #70 of 83.

Mercer County ranked among 88 county-level areas in Ohio (1 = highest); measures without data in every county rank a smaller field, down to 83.
MeasureMercer CountyOhio rank
Traffic volume (AADT)3,270#45 of 88
Highway vehicle-miles per day289,222#69 of 83
Truck share on highways11.9%#61 of 83
Highway trucks per day750#70 of 83
Average travel time33.4 min#43 of 88
Average driver income$80,887#22 of 88
Average driver age49.1 yrs#46 of 88

Mercer County ranks #22 of 88 on average driver income but #70 of 83 on highway truck volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Mercer County, Ohio

On their busiest stretches, the three busiest roads in Mercer County carry 12,095 vehicles a day on average, 3.7 times the typical road in the county (3,270).

Market Street is the busiest road, at 13,518 vehicles a day, 1,113 of them trucks (8.2%). US 33 carries the most trucks, 1,187 a day (16.2% of its traffic), although it is not among the 5 busiest roads overall.

US 33 carries longer journeys than most roads here, with a median trip of 63.6 minutes against 33.4 county-wide.

Drivers on Eastern Avenue come from neighborhoods with an average household income of $108,164, 34% above the county average of $80,887.

Freight stands out on US 33 and Eastern Avenue: trucks are 16.2% and 16.0% of the traffic there, against 10.2% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Market StreetTrunk road · 13,518vehicles1,113trucks · 8.2%
Road class
Trunk road
Congestion ratio
30.4%
Median trip time
32.4 min
Drivers’ median age
49.2 yrs
Drivers’ average income
$76,533

Market Street is one of the more congested roads here: trips take 30% longer than at free-flow speed, against 9% county-wide.

2SR 29Trunk road · 12,426vehicles1,180trucks · 9.5%
Road class
Trunk road
Congestion ratio
13.1%
Median trip time
32.8 min
Drivers’ median age
48.6 yrs
Drivers’ average income
$75,233

SR 29 carries 3.8 times the county average at its busiest, 1,180 of them trucks (9.5%, below the county-wide 10.2%).

3Main StreetTrunk road · 10,342vehicles811trucks · 7.8%
Road class
Trunk road
Congestion ratio
20.2%
Median trip time
32.2 min
Drivers’ median age
49.4 yrs
Drivers’ average income
$77,192

Main Street carries 3.2 times the county average on its busiest stretch, where the median trip lasts 32.2 minutes.

4US 127Trunk road · 9,148vehicles851trucks · 9.3%
Road class
Trunk road
Congestion ratio
20.7%
Median trip time
35.7 min
Drivers’ median age
49.0 yrs
Drivers’ average income
$81,023

Delays build on US 127: its congestion ratio of 21% over free-flow time is well above the county's 9%.

5Logan StreetTrunk road · 7,747vehicles687trucks · 8.9%
Road class
Trunk road
Congestion ratio
18.9%
Median trip time
32.7 min
Drivers’ median age
48.3 yrs
Drivers’ average income
$77,949

At 2.4 times the county average, Logan Street draws drivers from neighborhoods averaging $77,949 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 33Primary road · 7,335vehicles1,187trucks · 16.2%
Road class
Primary road
Congestion ratio
17.6%
Median trip time
63.6 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$78,012

The busiest stretch of US 33 carries 2.2 times the county average; trucks are 16.2% of it, above the county-wide 10.2%.

2SR 29Trunk road · #2 by traffic12,426vehicles1,180trucks · 9.5%
3Eastern AvenueSecondary road · 7,218vehicles1,156trucks · 16.0%
Road class
Secondary road
Congestion ratio
17.3%
Median trip time
26.7 min
Drivers’ median age
47.6 yrs
Drivers’ average income
$108,164

On its busiest stretch, Eastern Avenue carries 2.2 times the county average; trucks are 16.0% of it, above the county-wide 10.2%.

4Market StreetTrunk road · #1 by traffic13,518vehicles1,113trucks · 8.2%
5US 127Trunk road · #4 by traffic9,148vehicles851trucks · 9.3%
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

MercerDepartment 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 Mercer County

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

Need segment-level traffic data?

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