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Traffic heat map of St. Clair County, Missouri: 240 miles of roads shaded from blue (light) to red (heavy traffic), busiest on MO 13 and 4th Street

St. Clair County, Missouri Traffic Counts

How busy are the roads of St. Clair County, Missouri? We measure 240 road miles, divided into 1,670 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, MO 13, carries 9,969 vehicles a day, 10.3 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 icon

Total Traffic Volume & Performance in St. Clair County, Missouri

Traffic

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

vehicles per day971
Trucks

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

13.5%
Average travel time

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

39.5 min
Drivers’ average age

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

53.5 yrs
Drivers’ average income

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

$50,883

A typical monitored road in St. Clair County, Missouri sees 971 vehicles per day, while its 240 miles of monitored roads together handle 395,257 vehicle-miles traveled per day (≈144 million per year). Trucks are 13.5% of traffic, more than the 9.8% across Missouri.

Quieter roads than 96% of counties in Missouri

At 971 vehicles per day, the average monitored road in St. Clair carries 83% less traffic than the state average of 5,631, suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, St. Clair accounts for about 0.2% of Missouri's statewide total of vehicle-miles. By volume, St. Clair's 971 vehicles per day trails 96% of counties in Missouri.

At 39.5 minutes, the average travel time is 26% higher than the state level. On travel time, St. Clair runs longer than 95% of counties in Missouri.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in St. Clair County, Missouri

Trafficvehicles per day4,930
Trucks15.3%
Average travel time71.8 min
Drivers’ average age53.3 yrs
Drivers’ average income$53,170

Most travel in St. Clair County, Missouri happens on highways, 74% of all vehicle-miles. The average highway carries 4,930 vehicles per day, 688% more than the average non-highway road in the same area, which carries 626 vehicles per day.

Yet highways are only 24% of the road network, 58 miles in 134 segments, so each mile of them is 3.0 times as busy as the average road mile.

Fewer highway trucks than 66% of counties in Missouri

At 15.3%, highway truck share is 14% higher than the state average. The highway traffic mix is typical for Missouri: neither freight- nor commuter-dominated.

By truck concentration, highways here outrank 58% of counties in Missouri. St. Clair's highway truck count is lower than 66% of counties in Missouri, at roughly 755 trucks per day.

non-highway traffic icon

Non-highway Traffic in St. Clair County, Missouri

Trafficvehicles per day626
Trucks8.5%
Average travel time36.7 min
Drivers’ average age54.9 yrs
Drivers’ average income$48,230

At 26% of vehicle-miles, local roads carry a smaller share of the traffic in St. Clair County, Missouri than highways. A typical local road sees 626 vehicles per day.

Local roads make up 76% of the monitored road miles (182 miles in 1,536 segments) but carry less than their share of travel: 104,454 vehicle-miles traveled per day (≈38.1 million per year). Trucks make up 8.5% of non-highway traffic, about 1 in 12 vehicles.

Drivers from lower-income areas than 94% of counties in Missouri

Compared to highways, non-highway routes see 44% fewer trucks by share.

St. Clair's average driver income is lower than 94% of counties in Missouri. The driver population here skews older than 94% of counties in Missouri.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

St. Clair County vs. Missouri Traffic Comparison

St. Clair County's biggest difference from the Missouri average is its average daily traffic per road, 83% below it. Its truck share, by contrast, is 38% above.

MetricSt. Clair CountyMissouri averageDifference
Traffic9715,631-82.8%
Truck % (Total Traffic)13.5%9.8%+37.8%
Truck % (Highway)15.3%13.4%+13.9%
Avg. Travel Time39.5 min31.3 min+26.3%

How St. Clair County compares

St. Clair County has the quietest roads among its nearby counties

Compared with its 4 closest neighbours, St. Clair County carries 52.9% less traffic on a typical road; it has the quietest roads of the five. Quiet roads and long journeys - a rural pattern, where the distance between destinations rather than the traffic on the way is what takes the time.

St. Clair 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
St. Clair County97113.5%395,25739.5 minN/A
Cedar County, Missouri1,6408.6%193,91132.8 minN/A
Henry County, Missouri2,66812.4%919,61334.0 minN/A
Hickory County, Missouri1,4029.6%210,11234.7 minN/A
Polk County, Missouri2,53311.0%773,27933.9 min15.4%
Missouri average5,6319.8%N/A31.3 min19.4%

St. Clair County ranked within Missouri

St. Clair County sits in the bottom quarter of the Missouri field on average daily traffic volume, at #110 of 115.

St. Clair County ranked among 115 county-level areas in Missouri (1 = highest); measures without data in every county rank a smaller field, down to 93.
MeasureSt. Clair CountyMissouri rank
Traffic volume (AADT)971#110 of 115
Highway vehicle-miles per day290,803#65 of 93
Truck share on highways15.3%#40 of 93
Highway trucks per day755#62 of 93
Average travel time39.5 min#7 of 115
Average driver income$50,883#108 of 115
Average driver age53.5 yrs#8 of 115

St. Clair County ranks #7 of 115 on average travel time but #110 of 115 on average daily traffic volume. Some of the longest trips in Missouri on some of its emptiest roads - distance, not congestion, is what sets travel time here.

Busiest roads in St. Clair County, Missouri

On their busiest stretches, the three busiest roads in St. Clair County carry 4,670 vehicles a day on average, 4.8 times the typical road in the county (971).

MO 13 is the busiest road, at 9,969 vehicles a day, 1,527 of them trucks (15.3%). No other road comes close: 4th Street, in second place, carries 2,366. It tops the truck ranking too, with the most trucks.

Trips using MO 13 are long: a median of 71.8 minutes against 39.5 county-wide, the mark of a through route.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1MO 13Trunk road · 9,969vehicles1,527trucks · 15.3%
Road class
Trunk road
Median trip time
71.8 min
Drivers’ median age
53.3 yrs
Drivers’ average income
$53,170

MO 13 is a trunk route for the county, carrying 10.3 times the county average on its busiest stretch; trucks are 15.3% of it, above the county-wide 13.5%.

24th StreetSecondary road · 2,366vehicles181trucks · 7.6%
Road class
Secondary road
Median trip time
28.4 min
Drivers’ median age
53.6 yrs
Drivers’ average income
$51,855

4th Street is a local road at heart: the median trip using it lasts 28.4 minutes, against 39.5 for the county.

3US 54Primary road · 1,674vehicles193trucks · 11.5%
Road class
Primary road
Median trip time
44.9 min
Drivers’ median age
56.9 yrs
Drivers’ average income
$44,720

US 54 peaks at 1,674 vehicles a day, 72% more than the county average; trucks are 11.5% of it, below the county-wide 13.5%.

4Chestnut StreetSecondary road · 1,495vehicles105trucks · 7.0%
Road class
Secondary road
Median trip time
32.2 min
Drivers’ median age
54.3 yrs
Drivers’ average income
$46,997

Chestnut Street carries 54% more than the county average at its busiest, 105 of them trucks (7.0%, below the county-wide 13.5%).

5MO 52Secondary road · 1,308vehicles105trucks · 8.0%
Road class
Secondary road
Median trip time
31.0 min
Drivers’ median age
53.9 yrs
Drivers’ average income
$51,552

MO 52 carries 35% more than the county average on its busiest stretch, where the median trip lasts 31.0 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1MO 13Trunk road · #1 by traffic9,969vehicles1,527trucks · 15.3%
2US 54Primary road · #3 by traffic1,674vehicles193trucks · 11.5%
34th StreetSecondary road · #2 by traffic2,366vehicles181trucks · 7.6%
4Chestnut StreetSecondary road · #4 by traffic1,495vehicles105trucks · 7.0%
5MO 52Secondary road · #5 by traffic1,308vehicles105trucks · 8.0%
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

St. ClairDepartment 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 St. Clair County

The same traffic breakdown for the areas closest to St. Clair County, Missouri.

Need segment-level traffic data?

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