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Traffic heat map of Marshall County, Indiana: 351 miles of roads shaded from blue (light) to red (heavy traffic), busiest on US 31 and US 30

Marshall County, Indiana Traffic Counts

How busy are the roads of Marshall County, Indiana? We measure 351 road miles, divided into 5,038 segments, with multi-sourced, cross-verified mobile and sensor data. Its busiest road, US 31, carries 19,099 vehicles a day, 5.5 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 Volume & Performance in Marshall County, Indiana

Traffic

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

vehicles per day3,500
Trucks

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

14.6%
Average travel time

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

34.1 min
Congestion ratio

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

10.7%
Drivers’ average age

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

48.0 yrs
Drivers’ average income

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

$71,616

Our data shows 3,500 vehicles per day on the average road in Marshall County, Indiana, and 1,407,085 vehicle-miles traveled per day (≈514 million per year) across its 351 miles of monitored roads. Trucks are 14.6% of traffic, more than the 12.1% across Indiana.

Traffic 39% below the Indiana average

At 3,500 vehicles per day, the average monitored road in Marshall carries 39% less traffic than the state average of 5,704, suggesting less demand on each road - lighter roads for freight, but less passing trade for roadside retail. Network-wide, Marshall accounts for about 0.9% of Indiana's statewide total of vehicle-miles. By volume, Marshall's 3,500 vehicles per day trails 54% of counties in Indiana.

At 34.1 minutes, the average travel time matches the state level closely. On travel time, Marshall runs shorter than 51% of counties in Indiana.

The congestion ratio of 10.7% is 31% lower, pointing to smoother traffic flow than the state level - fewer delays make delivery windows more reliable.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Marshall County, Indiana

Trafficvehicles per day8,375
Trucks20.2%
Average travel time59.0 min
Congestion ratio18.5%
Drivers’ average age47.2 yrs
Drivers’ average income$73,230

A little more than half of the driving in Marshall County, Indiana happens on highways: 56% of all vehicle-miles. The average highway carries 8,375 vehicles per day, 156% more than the average non-highway road in the same area, which carries 3,271 vehicles per day.

With 26% of the road miles (92 miles in 226 segments), highways punch above their length, carrying 781,741 vehicle-miles traveled per day (≈285 million per year).

62% of counties in Indiana move less traffic on their highways.

Fewer highway trucks than 65% of counties in Indiana

At 20.2%, the highway truck share matches the state average for similar road classifications. The highway traffic mix is typical for Indiana: neither freight- nor commuter-dominated.

Marshall's highway truck share (20.2%) is higher than 51% of counties in Indiana. By raw truck volume, Marshall carries fewer highway trucks than 65% of counties in Indiana.

non-highway traffic icon

Non-highway Traffic in Marshall County, Indiana

Trafficvehicles per day3,271
Trucks7.6%
Average travel time32.9 min
Congestion ratio10.3%
Drivers’ average age48.4 yrs
Drivers’ average income$70,725

A significant share of driving in Marshall County, Indiana, 44% of vehicle-miles, happens on local roads. The average non-highway road carries 3,271 vehicles per day.

Spread over 259 miles and 4,812 segments, 74% of the road network, local roads carry a lighter load per mile: 625,344 vehicle-miles traveled per day (≈228 million per year). The truck share on non-highway roads is 7.6%.

Local congestion 32% below the Indiana average

Compared to highways, non-highway routes see 63% fewer trucks by share.

At 32% lower than the state level, the non-highway congestion ratio of 10.3% signals easier movement on local roads.

58% of counties in Indiana see higher average driver income among trip origins than Marshall. Marshall's median driver age is higher than 52% of counties in Indiana.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

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

Marshall County vs. Indiana Traffic Comparison

The average daily traffic per road sets Marshall County apart: 39% below the Indiana average. Its truck share, by contrast, is 21% above.

MetricMarshall CountyIndiana averageDifference
Traffic3,5005,704-38.6%
Truck % (Total Traffic)14.6%12.1%+20.8%
Truck % (Highway)20.2%19.6%+3.4%
Avg. Travel Time34.1 min33.5 min+1.7%

How Marshall County compares

Marshall County against nearby counties

Marshall County tracks the 4 areas around it closely - no measure in this table sets it far apart from the areas immediately next to it, though it has the second busiest roads of the five.

Marshall County and the 4 nearest county-level areas by centroid distance, with the Indiana average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Marshall County3,50014.6%1,407,08534.1 min10.7%
Starke County, Indiana3,35614.3%458,95033.8 min7.9%
Fulton County, Indiana2,84412.6%492,19732.2 min8.5%
St. Joseph County, Indiana6,99112.8%5,428,16234.9 min16.1%
Kosciusko County, Indiana3,42210.0%1,694,85336.8 min9.8%
Indiana average5,70412.1%N/A33.5 min15.6%

Marshall County ranked within Indiana

On all 7 measures below, Marshall County lands in the middle of the Indiana field rather than at either end.

Marshall County ranked among 92 county-level areas in Indiana (1 = highest); measures without data in every county rank a smaller field, down to 79.
MeasureMarshall CountyIndiana rank
Traffic volume (AADT)3,500#50 of 92
Highway vehicle-miles per day781,741#31 of 79
Truck share on highways20.2%#39 of 79
Highway trucks per day1,696#52 of 79
Average travel time34.1 min#47 of 92
Average driver income$71,616#54 of 92
Average driver age48.0 yrs#45 of 92

Busiest roads in Marshall County, Indiana

Traffic concentrates on a few corridors: the three busiest roads average 15,725 vehicles a day, against 3,500 on the average road in Marshall County.

US 31 is the busiest road, at 19,099 vehicles a day, 4,040 of them trucks (21.1%). It tops the truck ranking too, with the most trucks.

US 30 carries longer journeys than most roads here, with a median trip of 59.6 minutes against 34.1 county-wide.

Michigan Street is busy with cars rather than freight: only 3.6% of its traffic is trucks, against 14.6% county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1US 31Motorway · 19,099vehicles4,040trucks · 21.1%
Road class
Motorway
Congestion ratio
22.3%
Median trip time
56.1 min
Drivers’ median age
46.6 yrs
Drivers’ average income
$74,038

Delays build on US 31: its congestion ratio of 22% over free-flow time is well above the county's 11%.

2US 30Trunk road · 15,026vehicles3,117trucks · 20.7%
Road class
Trunk road
Congestion ratio
17.0%
Median trip time
59.6 min
Drivers’ median age
47.7 yrs
Drivers’ average income
$73,489

The busiest stretch of US 30 carries 4.3 times the county average; trucks are 20.7% of it, above the county-wide 14.6%.

3Michigan StreetSecondary road · 13,050vehicles471trucks · 3.6%
Road class
Secondary road
Congestion ratio
20.8%
Median trip time
37.7 min
Drivers’ median age
48.8 yrs
Drivers’ average income
$65,071

On its busiest stretch, Michigan Street carries 3.7 times the county average; trucks are 3.6% of it, below the county-wide 14.6%.

4Oak RoadTertiary road · 9,152vehicles277trucks · 3.0%
Road class
Tertiary road
Congestion ratio
21.8%
Median trip time
30.4 min
Drivers’ median age
49.1 yrs
Drivers’ average income
$67,359

Travel on Oak Road's busiest stretch runs 22% over free-flow time, against 11% across the county, so expect slower peak hours.

5Jefferson StreetSecondary road · 8,657vehicles315trucks · 3.6%
Road class
Secondary road
Congestion ratio
20.6%
Median trip time
28.6 min
Drivers’ median age
48.0 yrs
Drivers’ average income
$68,133

Jefferson Street peaks at 8,657 vehicles a day, 2.5 times the county average; trucks are 3.6% of it, below the county-wide 14.6%.

Ranked by trucks per day

Cars and light vehiclesTrucks
1US 31Motorway · #1 by traffic19,099vehicles4,040trucks · 21.1%
2US 30Trunk road · #2 by traffic15,026vehicles3,117trucks · 20.7%
3Grand Army of the Republic HighwayPrimary road · 6,596vehicles777trucks · 11.8%
Road class
Primary road
Congestion ratio
12.3%
Median trip time
37.6 min
Drivers’ median age
47.6 yrs
Drivers’ average income
$72,774

Grand Army of the Republic Highway is busy by local standards, at 88% more than the county average on its busiest stretch; trucks are 11.8% of it, below the county-wide 14.6%.

4Plymouth StreetSecondary road · 7,916vehicles540trucks · 6.8%
Road class
Secondary road
Congestion ratio
19.2%
Median trip time
29.1 min
Drivers’ median age
45.6 yrs
Drivers’ average income
$74,623

Plymouth Street carries 2.3 times the county average at its busiest, 540 of them trucks (6.8%, below the county-wide 14.6%).

5Michigan StreetSecondary road · #3 by traffic13,050vehicles471trucks · 3.6%
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

MarshallDepartment 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 Marshall County

The same traffic breakdown for the areas closest to Marshall County, Indiana.

Need segment-level traffic data?

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