Need segment-level traffic data?

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

Get insights →
Home
United States
IllinoisMercer
traffic map

Mercer County, Illinois Traffic Counts

This page delivers traffic analytics for Mercer County, Illinois. Our metrics are calculated with multi-sourced, cross-verified data from real-world mobile and sensor networks, and averaged for Mercer County, Illinois among 170 road miles divided in 1,336 segments. Our metrics go beyond simple volume counts to provide actionable insights on traffic intensity, congestion, commercial vehicle flow, and network performance with highest possible granularity (average segment length is 670 ft). Whether you are evaluating a new retail location, planning logistics routes, or assessing infrastructure needs, this data helps you move from assumptions to certainty.
Data sourced from TrafficZoom's proprietary analytics platform.
Data current as of:
Q3 2026
Find my place
total traffic icon

Total Traffic Volume & Performance

Traffic

Traffic

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

2,196

Trucks

Trucks

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

9.0%

Average travel time

Average travel time

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

29.6 min

Congestion ratio

Congestion ratio

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

8.4%

Drivers’ average age

Drivers’ average age

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

51.9 yrs

Drivers’ average income

Drivers’ average income

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

$73,340

Our data indicates an estimated average traffic volume of 2,196 vehicles per day in Mercer County, Illinois that results in 299,994 vehicle-miles traveled per day (≈109 million per year). The traffic stream is comprised of an average of 1 truck for every 11 vehicles. Typical time spent behind the wheel per trip is 29.6 minutes, which already accounts for delays at signals, intersections, and congestion.

Analytical insight

When compared to the Illinois state averages: Mercer sees 74% lower average daily traffic volume than the state average (2,196 vehicles per day against 8,480), suggesting less demand on each road - a critical factor for logistics and site planning. In total volume terms, its road network carries 299,994 vehicle-miles traveled per day (≈109 million per year), about 0.1% of Illinois's statewide total. The average trip takes 29.6 minutes, 13% lower than the state level. Congestion runs 59% lower than the state level, at a ratio of 8.4% - smoother traffic flow - crucial for traffic control improvement and logistics planning. By volume, Mercer's 2,196 vehicles per day outpaces 20% of counties in Illinois. On travel time, Mercer runs longer than 3% of counties in Illinois.

Highway vs. Non-Highway Traffic Analysis

Analytical insight

N/A
non-highway traffic icon

Non-highway traffic

Traffic

Traffic

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

2,196

Trucks

Trucks

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

9.0%

Average travel time

Average travel time

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

29.6 min

Congestion ratio

Congestion ratio

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

8.4%

Drivers’ average age

Drivers’ average age

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

51.9 yrs

Drivers’ average income

Drivers’ average income

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

$73,340

The non-highway road network in Mercer County, Illinois supports a substantial volume of traffic. The average non-highway road carries 2,196 vehicles per day. That average covers 170 non-highway road miles divided in 1,336 segments (average segment length 670 ft), together carrying 299,994 vehicle-miles traveled per day (≈109 million per year). Trucks constitute 9.0% of non-highway traffic.

Analytical insight

The non-highway congestion ratio of 8.4% is 59% lower than the state level, suggesting more efficient local mobility than the state average. Overall, average travel time here is longer than 3% of counties in Illinois. Trip origins here have higher average income than 52% of counties in Illinois. 85% of counties in Illinois have a younger driver population than Mercer.

Time-of-Day & Seasonal Patterns

Analytical insight

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

Traffic Flow Profile Comparison

Metric

Mercer

Illinois
Average

Difference

Traffic

2,196

8,480

-74.1%

Truck % (Total Traffic)

9.0%

10.2%

-11.9%

Truck % (Highway)

17.3%

Avg. Travel Time

29.6 min

34.1 min

-13.4%

How Mercer County compares

Mercer County against nearby areas

Against the 4 nearest areas, Mercer County is 31.6% more congested; it has the second busiest roads of the five.

Mercer County and the 4 nearest county-level areas by centroid distance, with the Illinois average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Mercer County2,1969.0%299,99429.6 min8.4%
Warren County, Illinois1,79311.6%500,34232.4 min6.7%
Henderson County, Illinois1,58010.2%252,44933.9 min5.1%
Louisa County, Iowa1,18010.7%238,87438.6 min5.3%
Muscatine County, Iowa2,4998.7%746,54833.6 min8.4%
Illinois average8,48010.2%N/A34.1 min20.6%

Mercer County ranked within Illinois

Average travel time places Mercer County #99 of 102 in Illinois - the bottom quarter of the state.

Where Mercer County sits among Illinois's county-level areas on each measure. Rank 1 is the highest value in the state, whether or not that is the outcome you want; the field size differs by measure because not every county carries highway data.
MeasureMercer CountyIllinois rank
Traffic volume (AADT)2,196#82 of 102
Average travel time29.6 min#99 of 102
Average driver income$73,340#49 of 102
Average driver age51.9 yrs#16 of 102

Mercer County ranks #16 of 102 on average driver age but #99 of 102 on average travel time - the two describe the same roads and are worth reading together rather than either on its own.

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

IllinoisDepartment of Transportation

Historical traffic pattern databases

U.S. Census Bureau
All metrics represent estimates based on statistical modeling and are intended for strategic planning purposes.
TrafficZoom methodology
link arrow icon
Data current as of:
Q3 2026

Explore further

TrafficZoom platform

— street-level analytics and custom corridor reports.

Map AI

— demographics, housing and mobility data.

Counties near Mercer County

The same traffic breakdown for the areas closest to Mercer County, Illinois.

Need segment-level traffic data?

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

Get access now
Get a demo
Ticon websiteC-Site website
© 2026 TICON. All rights reserved.