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Traffic heat map of St. Charles County, Missouri: 831 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 70 and Page Avenue

St. Charles County, Missouri Traffic Counts

TrafficZoom tracks traffic on 831 road miles in St. Charles County, Missouri, divided into 19,475 segments averaging 225 ft. It has the busiest roads of any county in Missouri, averaging 12,653 vehicles a day. 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 St. Charles County, Missouri

Traffic

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

vehicles per day12,653
Trucks

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

6.2%
Average travel time

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

29.1 min
Congestion ratio

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

32.7%
Drivers’ average age

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

46.8 yrs
Drivers’ average income

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

$105,931

The average monitored road in St. Charles County, Missouri carries 12,653 vehicles per day. Across its 831 miles of monitored roads, that adds up to 11,743,703 vehicle-miles traveled per day (≈4.3 billion per year). Trucks are a smaller part of the mix than across Missouri: 6.2% against 9.8%.

The busiest roads of any county in Missouri

At 12,653 vehicles per day, the average monitored road in St. Charles carries 125% more traffic than the state average of 5,631, suggesting more demand on each road - prime passing trade for storefronts, with more competition for road space. Across the whole network, that travel is about 6.8% of Missouri's statewide total. In fact, St. Charles has the highest average traffic volume of any county in Missouri, at 12,653 vehicles per day.

Journey times run 7% lower than the state level, at 29.1 minutes on average. On travel time, St. Charles runs shorter than 89% of counties in Missouri.

At 68% higher than the state level, the 32.7% congestion ratio signals more pronounced congestion - peak-hour routing and delivery windows need real slack here.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in St. Charles County, Missouri

Trafficvehicles per day33,555
Trucks8.9%
Average travel time33.5 min
Congestion ratio58.6%
Drivers’ average age46.6 yrs
Drivers’ average income$102,863

Travel in St. Charles County, Missouri splits roughly evenly, with about half of it (50% of vehicle-miles) on highways. The average highway carries 33,555 vehicles per day, 182% more than the average non-highway road in the same area, which carries 11,880 vehicles per day.

Highways make up 20% of the monitored road miles (167 miles, 694 segments), so they carry more than their share: 5,923,696 vehicle-miles traveled per day (≈2.2 billion per year).

That puts St. Charles among the top 3 counties in Missouri for highway travel volume.

Lower highway truck share than 97% of counties in Missouri

At 8.9%, highway truck share is 34% lower than the state average. Trucks are a small share of a very large highway flow, so St. Charles still moves heavy freight volumes alongside its passenger traffic.

97% of counties in Missouri see a higher highway truck share than St. Charles's 8.9%. 90% of counties in Missouri see fewer highway trucks per day than St. Charles's roughly 2,996.

non-highway traffic icon

Non-highway Traffic in St. Charles County, Missouri

Trafficvehicles per day11,880
Trucks3.5%
Average travel time29.0 min
Congestion ratio31.7%
Drivers’ average age46.9 yrs
Drivers’ average income$108,985

Travel in St. Charles County, Missouri splits roughly evenly, with about half of it (50% of vehicle-miles) on local roads. The average non-highway road carries 11,880 vehicles per day.

Spread over 664 miles and 18,781 segments, 80% of the road network, local roads carry a lighter load per mile: 5,820,006 vehicle-miles traveled per day (≈2.1 billion per year). The truck share on non-highway roads is 3.5%.

The highest driver income of any county in Missouri

The concentration of trucks on non-highway roads is 61% lower than on highways.

The non-highway congestion ratio of 31.7% is 70% higher than the state level, suggesting slower local mobility than the state average.

St. Charles also has the highest average driver income in Missouri among trip origins - $105,931. St. Charles's median driver age is lower than 79% of counties in Missouri.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
AM peak 7:00 AM–8:00 AM and a long afternoon plateau from 3:00 PM to 7:00 PM, with volumes reaching approximately 73% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 21% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
April–June is the high season, with volumes +5% versus the annual average.
Lowest month:
January is the quietest month, with volumes -14% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In St. Charles County, Missouri, the peak hour concentrates about 7% of the day's traffic, and there is a noticeable seasonal swing of +5% in high season.

St. Charles County vs. Missouri Traffic Comparison

Of the four measures, average daily traffic per road differs most: St. Charles County runs 125% above the Missouri average. Its truck share, by contrast, is 36% below.

MetricSt. Charles CountyMissouri averageDifference
Traffic12,6535,631+124.7%
Truck % (Total Traffic)6.2%9.8%-36.4%
Truck % (Highway)8.9%13.4%-33.6%
Avg. Travel Time29.1 min31.3 min-6.9%

How St. Charles County compares

St. Charles County is more congested than any nearby county

Against the 4 nearest areas, St. Charles County carries 91.6% more traffic on a typical road; it has the busiest roads of the five. Bigger and busier at once: more road than the areas around it and heavier traffic on it, which makes it the centre of gravity for travel in this part of the map.

St. Charles 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. Charles County12,6536.2%11,743,70329.1 min32.7%
St. Louis County, Missouri12,3326.6%24,969,89729.4 min28.2%
Warren County, Missouri3,65613.8%1,516,29430.0 min14.9%
Lincoln County, Missouri5,0657.9%1,926,24928.6 min9.1%
Franklin County, Missouri5,36412.4%4,081,21132.8 minN/A
Missouri average5,6319.8%N/A31.3 min19.4%

St. Charles County ranked within Missouri

St. Charles County leads Missouri on 2 of the measures below: average daily traffic volume and average driver income.

St. Charles 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. Charles CountyMissouri rank
Traffic volume (AADT)12,653#1 of 115
Highway vehicle-miles per day5,923,696#3 of 93
Truck share on highways8.9%#90 of 93
Highway trucks per day2,996#10 of 93
Average travel time29.1 min#103 of 115
Average driver income$105,931#1 of 115
Average driver age46.8 yrs#91 of 115

St. Charles County ranks #3 of 93 on highway travel volume but #90 of 93 on truck share on highways. It carries some of the heaviest highway traffic in Missouri, but very little of it is freight - this is commuter and local car volume, not through-trucking.

Busiest roads in St. Charles County, Missouri

On their busiest stretches, the three busiest roads in St. Charles County carry 93,739 vehicles a day on average, 7.4 times the typical road in the county (12,653).

I 70 is the busiest road, at 114,214 vehicles a day, 11,875 of them trucks (10.4%). It tops the truck ranking too, with the most trucks.

Trucks make up 11.2% of traffic on MO 370, against 6.2% across all roads in the county.

Highway K is busy with cars rather than freight: only 2.7% of its traffic is trucks, against 6.2% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 70Motorway · 114,214vehicles11,875trucks · 10.4%
Road class
Motorway
Congestion ratio
68.7%
Median trip time
33.9 min
Drivers’ median age
46.2 yrs
Drivers’ average income
$95,773

Delays build on I 70: its congestion ratio of 69% over free-flow time is well above the county's 33%.

2Page AvenueMotorway · 86,658vehicles4,016trucks · 4.6%
Road class
Motorway
Congestion ratio
44.2%
Median trip time
26.8 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$109,357

Page Avenue is a trunk route for the county, carrying 6.8 times the county average on its busiest stretch; trucks are 4.6% of it, below the county-wide 6.2%.

3Highway KPrimary road · 80,346vehicles2,200trucks · 2.7%
Road class
Primary road
Congestion ratio
98.3%
Median trip time
27.9 min
Drivers’ median age
46.6 yrs
Drivers’ average income
$116,217

Travel on Highway K's busiest stretch runs 98% over free-flow time, against 33% across the county, so expect slower peak hours.

4MO 364Motorway · 78,530vehicles3,738trucks · 4.8%
Road class
Motorway
Congestion ratio
39.0%
Median trip time
28.4 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$110,204

MO 364 carries 6.2 times the county average at its busiest, 3,738 of them trucks (4.8%, below the county-wide 6.2%).

5MO 364 / MO 94Motorway · 74,632vehicles3,349trucks · 4.5%
Road class
Motorway
Congestion ratio
38.6%
Median trip time
30.6 min
Drivers’ median age
46.5 yrs
Drivers’ average income
$109,399

MO 364 / MO 94 carries 5.9 times the county average on its busiest stretch, where the median trip lasts 30.6 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 70Motorway · #1 by traffic114,214vehicles11,875trucks · 10.4%
2Avenue of the SaintsTrunk road · 68,328vehicles4,497trucks · 6.6%
Road class
Trunk road
Congestion ratio
56.1%
Median trip time
32.2 min
Drivers’ median age
46.7 yrs
Drivers’ average income
$93,576

At 5.4 times the county average, Avenue of the Saints draws drivers from neighborhoods averaging $93,576 in household income.

3MO 370Motorway · 38,908vehicles4,379trucks · 11.2%
Road class
Motorway
Congestion ratio
26.2%
Median trip time
34.3 min
Drivers’ median age
46.2 yrs
Drivers’ average income
$87,863

MO 370 carries 3.1 times the county average on its busiest stretch, where the median trip lasts 34.3 minutes.

4Page AvenueMotorway · #2 by traffic86,658vehicles4,016trucks · 4.6%
5MO 364Motorway · #4 by traffic78,530vehicles3,738trucks · 4.8%
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. CharlesDepartment 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. Charles County

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

Need segment-level traffic data?

Identify traffic patterns street by street and analyze the exact corridors that matter to your project.