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Traffic heat map of Mercer County, Missouri: 103 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 65 and Grant Street

Mercer County, Missouri Traffic Counts

Our Mercer County, Missouri traffic data covers 562 road segments over 103 road miles, with an average segment of just 969 ft. The average road here carries 1,121 vehicles a day, 80% less than the Missouri average of 5,631. Whether you are evaluating a new retail location, planning routes or assessing infrastructure, these numbers replace guesswork.
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, Missouri

Traffic

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

vehicles per day1,121
Trucks

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

10.6%
Average travel time

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

36.0 min
Drivers’ average age

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

52.0 yrs
Drivers’ average income

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

$58,659

The average monitored road in Mercer County, Missouri carries 1,121 vehicles per day. Across its 103 miles of monitored roads, that adds up to 94,145 vehicle-miles traveled per day (≈34.4 million per year). About 1 in 9 vehicles is a truck, in line with Missouri (9.8%).

Traffic 80% below the Missouri average

Mercer's average daily traffic volume is 80% lower than the state average - 1,121 vehicles per day against 5,631 - suggesting less traffic load per road - very light roads: easy truck access, but little passing trade for roadside retail. Network-wide, Mercer accounts for less than 0.1% of Missouri's statewide total of vehicle-miles. Mercer carries less traffic than 90% of counties in Missouri.

Journey times run 15% higher than the state level, at 36.0 minutes on average. On travel time, Mercer runs longer than 86% of counties in Missouri.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Mercer County vs. Missouri Traffic Comparison

Mercer County's biggest difference from the Missouri average is its average daily traffic per road, 80% below it. Its average travel time, by contrast, is 15% above.

MetricMercer CountyMissouri averageDifference
Traffic1,1215,631-80.1%
Truck % (Total Traffic)10.6%9.8%+7.5%
Avg. Travel Time36.0 min31.3 min+15.2%

How Mercer County compares

Mercer County moves the least traffic of its nearby counties

Against the 4 nearest areas, Mercer County moves 25.7% of the total daily travel and runs 5.1 percentage points less truck traffic; it has the fourth busiest roads of the five. Smaller and quieter on both counts: a shorter network than the areas around it, carrying lighter traffic across it.

Mercer County and the 4 nearest county-level areas by centroid distance, with the Missouri average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Mercer County1,12110.6%94,14536.0 minN/A
Grundy County, Missouri1,5668.5%192,84435.9 minN/A
Harrison County, Missouri1,75920.7%593,42730.9 min3.2%
Decatur County, Iowa1,48022.2%518,78730.1 minN/A
Wayne County, Iowa1,05311.0%160,12239.2 min6.1%
Missouri average5,6319.8%N/A31.3 min19.4%

Mercer County ranked within Missouri

Average daily traffic volume places Mercer County #104 of 115 in Missouri - the bottom quarter of the state.

Mercer County ranked among 115 county-level areas in Missouri (1 = highest).
MeasureMercer CountyMissouri rank
Traffic volume (AADT)1,121#104 of 115
Average travel time36.0 min#17 of 115
Average driver income$58,659#76 of 115
Average driver age52.0 yrs#17 of 115

Mercer County ranks #17 of 115 on average travel time but #104 of 115 on average daily traffic volume - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Mercer County, Missouri

On their busiest stretches, the three busiest roads in Mercer County carry 2,664 vehicles a day on average, 2.4 times the typical road in the county (1,121).

US 65 is the busiest road, at 2,848 vehicles a day, 309 of them trucks (10.8%). It tops the truck ranking too, with the most trucks.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 65Primary road · 2,848vehicles309trucks · 10.8%
Road class
Primary road
Median trip time
34.8 min
Drivers’ median age
52.7 yrs
Drivers’ average income
$59,400

US 65 peaks at 2,848 vehicles a day, 2.5 times the county average; trucks are 10.8% of it, in line with the county-wide 10.6%.

2Grant StreetPrimary road · 2,696vehicles251trucks · 9.3%
Road class
Primary road
Median trip time
37.4 min
Drivers’ median age
51.8 yrs
Drivers’ average income
$58,367

Grant Street carries 2.4 times the county average at its busiest, 251 of them trucks (9.3%, below the county-wide 10.6%).

3Gaza PlacePrimary road · 2,448vehicles275trucks · 11.2%
Road class
Primary road
Median trip time
37.9 min
Drivers’ median age
52.5 yrs
Drivers’ average income
$60,984

Gaza Place carries 2.2 times the county average on its busiest stretch, where the median trip lasts 37.9 minutes.

4Jigsaw AvenuePrimary road · 2,104vehicles246trucks · 11.7%
Road class
Primary road
Median trip time
43.4 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$59,514

Jigsaw Avenue is busy by local standards, at 88% more than the county average on its busiest stretch; trucks are 11.7% of it, above the county-wide 10.6%.

5College StreetPrimary road · 2,055vehicles232trucks · 11.3%
Road class
Primary road
Median trip time
29.4 min
Drivers’ median age
53.0 yrs
Drivers’ average income
$57,168

College Street peaks at 2,055 vehicles a day, 83% more than the county average; trucks are 11.3% of it, above the county-wide 10.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 65Primary road · #1 by traffic2,848vehicles309trucks · 10.8%
2Gaza PlacePrimary road · #3 by traffic2,448vehicles275trucks · 11.2%
3Grant StreetPrimary road · #2 by traffic2,696vehicles251trucks · 9.3%
4Jigsaw AvenuePrimary road · #4 by traffic2,104vehicles246trucks · 11.7%
5College StreetPrimary road · #5 by traffic2,055vehicles232trucks · 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

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, Missouri.

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