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Traffic heat map of Jefferson County, Missouri: 749 miles of roads shaded from blue (light) to red (heavy traffic), busiest on I 55 and MO 141

Jefferson County, Missouri Traffic Counts

Our Jefferson County, Missouri traffic data covers 16,877 road segments over 749 road miles, with an average segment of just 234 ft. It is one of the top 5 counties in Missouri for highway travel volume. 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 icon

Total Traffic Volume & Performance in Jefferson County, Missouri

Traffic

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

vehicles per day6,329
Trucks

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

7.0%
Average travel time

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

30.6 min
Congestion ratio

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

17.3%
Drivers’ average age

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

47.9 yrs
Drivers’ average income

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

$84,471

A typical monitored road in Jefferson County, Missouri sees 6,329 vehicles per day, while its 749 miles of monitored roads together handle 6,507,227 vehicle-miles traveled per day (≈2.4 billion per year). Trucks are a smaller part of the mix than across Missouri: 7.0% against 9.8%.

Busier roads than 91% of counties in Missouri

Jefferson's average daily traffic volume is 12% higher than the state average - 6,329 vehicles per day against 5,631 - a factor worth weighing in site selection and logistics planning. Network-wide, Jefferson accounts for about 3.8% of Missouri's statewide total of vehicle-miles. By volume, Jefferson's 6,329 vehicles per day outpaces 91% of counties in Missouri.

The average trip takes 30.6 minutes, on par with the state level. On travel time, Jefferson runs shorter than 72% of counties in Missouri.

The congestion ratio of 17.3% runs slightly lower than the state level (11% lower) - crucial for traffic control improvement and logistics planning.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Jefferson County, Missouri

Trafficvehicles per day15,296
Trucks8.9%
Average travel time35.2 min
Congestion ratio38.7%
Drivers’ average age48.2 yrs
Drivers’ average income$83,799

A little more than half of the driving in Jefferson County, Missouri happens on highways: 57% of all vehicle-miles. The average highway carries 15,296 vehicles per day, 164% more than the average non-highway road in the same area, which carries 5,789 vehicles per day.

Highways make up 26% of the monitored road miles (193 miles, 959 segments), so they carry more than their share: 3,726,131 vehicle-miles traveled per day (≈1.4 billion per year).

By highway travel volume, that ranks Jefferson in the top 5 counties in Missouri.

Lower highway truck share than 98% of counties in Missouri

Highway truck concentration here runs 34% lower than the state average, at 8.9%. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

By truck concentration, highways here trail 98% of counties in Missouri. Jefferson's highway truck count is higher than 61% of counties in Missouri, at roughly 1,364 trucks per day.

non-highway traffic icon

Non-highway Traffic in Jefferson County, Missouri

Trafficvehicles per day5,789
Trucks4.4%
Average travel time30.4 min
Congestion ratio16.0%
Drivers’ average age47.7 yrs
Drivers’ average income$85,325

A significant share of driving in Jefferson County, Missouri, 43% of vehicle-miles, happens on local roads. A typical local road sees 5,789 vehicles per day.

Spread over 556 miles and 15,918 segments, 74% of the road network, local roads carry a lighter load per mile: 2,781,096 vehicle-miles traveled per day (≈1.0 billion per year). About 1 in 23 vehicles on non-highway roads is a truck (4.4%).

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

Non-highway roads carry a truck concentration that's 51% lower than the highway network.

Non-highway congestion (16.0%) runs slightly lower than the state level (14% lower).

Trip origins here have higher average income than 94% of counties in Missouri. The driver population here skews younger than 69% 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 PM peak 4:00 PM–7:00 PM, with volumes reaching approximately 83% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 14% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +8% versus the annual average.
Lowest month:
January is the quietest month, with volumes -16% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Jefferson County, Missouri, the peak hour concentrates about 8% of the day's traffic, and there is a noticeable seasonal swing of +8% in high season.

Jefferson County vs. Missouri Traffic Comparison

Of the four measures, highway truck share differs most: Jefferson County runs 34% below the Missouri average. Its truck share is also 29% below.

MetricJefferson CountyMissouri averageDifference
Traffic6,3295,631+12.4%
Truck % (Total Traffic)7.0%9.8%-28.9%
Truck % (Highway)8.9%13.4%-33.7%
Avg. Travel Time30.6 min31.3 min-2.1%

How Jefferson County compares

Jefferson County against nearby counties and cities

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

Jefferson 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
Jefferson County6,3297.0%6,507,22730.6 min17.3%
Monroe County, Illinois4,8777.0%733,96529.5 min13.0%
St. Louis County, Missouri12,3326.6%24,969,89729.4 min28.2%
Franklin County, Missouri5,36412.4%4,081,21132.8 minN/A
St. Louis City, Missouri9,8257.9%4,407,53934.9 min29.0%
Missouri average5,6319.8%N/A31.3 min19.4%

Jefferson County ranked within Missouri

Jefferson County sits in the bottom quarter of the Missouri field on truck share on highways, at #91 of 93.

Jefferson County ranked among 115 county-level areas in Missouri (1 = highest); measures without data in every county rank a smaller field, down to 93.
MeasureJefferson CountyMissouri rank
Traffic volume (AADT)6,329#11 of 115
Highway vehicle-miles per day3,726,131#5 of 93
Truck share on highways8.9%#91 of 93
Highway trucks per day1,364#37 of 93
Average travel time30.6 min#83 of 115
Average driver income$84,471#8 of 115
Average driver age47.9 yrs#80 of 115

Jefferson County ranks #5 of 93 on highway travel volume but #91 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 Jefferson County, Missouri

On their busiest stretches, the three busiest roads in Jefferson County carry 49,028 vehicles a day on average, 7.7 times the typical road in the county (6,329).

I 55 leads with 65,212 vehicles a day, 7,095 of them trucks (10.9%). That is 54% more than the next road, MO 141 (42,426). It tops the truck ranking too, with the most trucks.

US 67 carries longer journeys than most roads here, with a median trip of 40.6 minutes against 30.6 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1I 55Motorway · 65,212vehicles7,095trucks · 10.9%
Road class
Motorway
Median trip time
38.6 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$84,415

I 55 carries 10.3 times the county average at its busiest, 7,095 of them trucks (10.9%, above the county-wide 7.0%).

2MO 141Trunk road · 42,426vehicles2,447trucks · 5.8%
Road class
Trunk road
Congestion ratio
48.0%
Median trip time
32.6 min
Drivers’ median age
48.3 yrs
Drivers’ average income
$92,533

MO 141 carries 6.7 times the county average on its busiest stretch, where the median trip lasts 32.6 minutes.

3MO 30Trunk road · 39,446vehicles2,242trucks · 5.7%
Road class
Trunk road
Congestion ratio
49.1%
Median trip time
29.1 min
Drivers’ median age
48.7 yrs
Drivers’ average income
$88,713

Travel on MO 30's busiest stretch runs 49% over free-flow time, against 17% across the county, so expect slower peak hours.

4Veterans Memorial BoulevardPrimary road · 32,833vehicles1,158trucks · 3.5%
Road class
Primary road
Median trip time
28.6 min
Drivers’ median age
48.1 yrs
Drivers’ average income
$78,696

At 5.2 times the county average, Veterans Memorial Boulevard draws drivers from neighborhoods averaging $78,696 in household income.

5Vogel RoadSecondary road · 32,103vehicles1,081trucks · 3.4%
Road class
Secondary road
Congestion ratio
79.3%
Median trip time
24.4 min
Drivers’ median age
48.2 yrs
Drivers’ average income
$93,405

Vogel Road is one of the more congested roads here: trips take 79% longer than at free-flow speed, against 17% county-wide.

Ranked by trucks per day

Cars and light vehiclesTrucks
1I 55Motorway · #1 by traffic65,212vehicles7,095trucks · 10.9%
2US 67Trunk road · 31,440vehicles2,564trucks · 8.2%
Road class
Trunk road
Congestion ratio
31.2%
Median trip time
40.6 min
Drivers’ median age
47.7 yrs
Drivers’ average income
$70,772

The busiest stretch of US 67 carries 5.0 times the county average; trucks are 8.2% of it, above the county-wide 7.0%.

3MO 141Trunk road · #2 by traffic42,426vehicles2,447trucks · 5.8%
4MO 30Trunk road · #3 by traffic39,446vehicles2,242trucks · 5.7%
5Gravois RoadTrunk road · 26,916vehicles1,726trucks · 6.4%
Road class
Trunk road
Median trip time
29.5 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$85,963

On its busiest stretch, Gravois Road carries 4.3 times the county average; trucks are 6.4% of it, below the county-wide 7.0%.

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

JeffersonDepartment 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 Jefferson County

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

Need segment-level traffic data?

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