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Traffic heat map of Jefferson County, Idaho: 235 miles of roads shaded from blue (light) to red (heavy traffic)

Jefferson County, Idaho Traffic Counts

Our Jefferson County, Idaho traffic data covers 1,851 road segments over 235 road miles, with an average segment of just 671 ft. The average road here carries 2,852 vehicles a day, 50% less than the Idaho average of 5,734. 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 Volume & Performance in Jefferson County, Idaho

Traffic

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

vehicles per day2,852
Trucks

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

8.4%
Average travel time

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

29.4 min
Congestion ratio

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

8.2%
Drivers’ average age

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

37.5 yrs
Drivers’ average income

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

$76,877

Our data shows 2,852 vehicles per day on the average road in Jefferson County, Idaho, and 692,370 vehicle-miles traveled per day (≈253 million per year) across its 235 miles of monitored roads. About 1 in 12 vehicles is a truck, in line with Idaho (9.7%).

Shorter trips than 91% of counties in Idaho

Jefferson sees 50% lower average daily traffic volume than the state average (2,852 vehicles per day against 5,734), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. In total volume terms, its road network carries about 1.5% of Idaho's statewide total of vehicle-miles. Jefferson carries less traffic than 56% of counties in Idaho.

At 29.4 minutes, the average travel time is 13% lower than the state level. Its average travel time of 29.4 minutes is shorter than 91% of counties in Idaho.

The congestion ratio of 8.2% is 49% lower, pointing to smoother traffic flow than the state level - travel times are easy to plan around for scheduled deliveries.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Jefferson County, Idaho

Trafficvehicles per day8,567
Trucks10.2%
Average travel time35.5 min
Congestion ratio4.4%
Drivers’ average age35.7 yrs
Drivers’ average income$72,854

Travel in Jefferson County, Idaho splits roughly evenly, with about half of it (54% of vehicle-miles) on highways. The average highway carries 8,567 vehicles per day, 229% more than the average non-highway road in the same area, which carries 2,607 vehicles per day.

Highways make up 34% of the monitored road miles (79 miles, 76 segments), so they carry more than their share: 374,033 vehicle-miles traveled per day (≈137 million per year).

By highway travel volume, Jefferson outranks 53% of counties in Idaho.

Passenger-oriented highways

At 10.2%, highway truck share is 27% lower than the state average. Highways here mostly serve passenger trips, so local access matters more than long-haul routing for logistics operators.

63% of counties in Idaho see a higher highway truck share than Jefferson's 10.2%. 62% of counties in Idaho see more highway trucks per day than Jefferson's roughly 878.

non-highway traffic icon

Non-highway Traffic in Jefferson County, Idaho

Trafficvehicles per day2,607
Trucks6.2%
Average travel time29.2 min
Congestion ratio8.3%
Drivers’ average age39.8 yrs
Drivers’ average income$81,448

Travel in Jefferson County, Idaho splits roughly evenly, with about half of it (46% of vehicle-miles) on local roads. A typical local road sees 2,607 vehicles per day.

Spread over 156 miles and 1,775 segments, 66% of the road network, local roads carry a lighter load per mile: 318,338 vehicle-miles traveled per day (≈116 million per year). Trucks make up 6.2% of non-highway traffic, about 1 in 16 vehicles.

Younger drivers than 95% of counties in Idaho

The concentration of trucks on non-highway roads is 40% lower than on highways.

Non-highway congestion (8.3%) runs 49% lower than the state average, pointing to smoother local traffic flow.

Jefferson's average driver income is higher than 84% of counties in Idaho. Jefferson's median driver age is lower than 95% of counties in Idaho.

Time-of-Day & Seasonal Patterns

peak hours icon
Peak Traffic Windows
Weekday peaks:
A long morning plateau from 8:00 AM to 12:00 PM and PM peak 5:00 PM–6:00 PM, with volumes reaching approximately 104% higher than the daily average.
Weekend traffic:
Weekends are somewhat quieter: volumes run about 16% below weekday levels, the usual weekend dip.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
June–August is the high season, with volumes +14% versus the annual average.
Lowest month:
January is the quietest month, with volumes -18% versus the annual average - the usual winter low.

Data Finding: Hourly & Seasonal Patterns

In Jefferson County, Idaho, the peak hour concentrates about 8% of the day's traffic, and there is a strong seasonal swing of +14% in high season.

Jefferson County vs. Idaho Traffic Comparison

The average daily traffic per road sets Jefferson County apart: 50% below the Idaho average. Its highway truck share is also 27% below.

MetricJefferson CountyIdaho averageDifference
Traffic2,8525,734-50.3%
Truck % (Total Traffic)8.4%9.7%-13.3%
Truck % (Highway)10.2%14.1%-27.2%
Avg. Travel Time29.4 min33.8 min-13.0%

How Jefferson County compares

Jefferson County against nearby counties

Compared with its 4 closest neighbours, Jefferson County sees 34.2% shorter typical trips; it has the third busiest roads of the five.

Jefferson County and the 4 nearest county-level areas by centroid distance, with the Idaho average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Jefferson County2,8528.4%692,37029.4 min8.2%
Clark County, Idaho40517.0%153,82572.5 minN/A
Madison County, Idaho4,3526.9%822,40333.5 min7.1%
Butte County, Idaho2,09011.2%255,69840.9 minN/A
Bingham County, Idaho3,92211.4%1,405,42932.2 min12.2%
Idaho average5,7349.7%N/A33.8 min16.0%

Jefferson County ranked within Idaho

Jefferson County sits in the bottom quarter of the Idaho field on average driver age, at #42 of 44.

Jefferson County ranked among 44 county-level areas in Idaho (1 = highest); measures without data in every county rank a smaller field, down to 35.
MeasureJefferson CountyIdaho rank
Traffic volume (AADT)2,852#25 of 44
Highway vehicle-miles per day374,033#17 of 35
Truck share on highways10.2%#22 of 35
Highway trucks per day878#22 of 35
Average travel time29.4 min#40 of 44
Average driver income$76,877#8 of 44
Average driver age37.5 yrs#42 of 44

Jefferson County ranks #8 of 44 on average driver income but #42 of 44 on average driver age - the two describe the same roads and are worth reading together rather than either on its own.

Busiest roads in Jefferson County, Idaho

The top three roads on this list in Jefferson County average 20,514 vehicles a day, 7.2 times the county average of 2,852 across all its monitored roads.

US 20 tops the list with 33,806 vehicles a day, 2,762 of them trucks (8.2%). That is 2.3 times the next road, East 1st South (14,798). It also carries the most trucks on the list.

Trips using I 15 are long: a median of 48.1 minutes against 29.4 county-wide, the mark of a through route.

Freight stands out on I 15: trucks are 15.5% of the traffic there, against 8.4% county-wide.

West 1st South is busy with cars rather than freight: only 4.1% of its traffic is trucks, against 8.4% county-wide.

Ranked by daily traffic (AADT)

Only named roads are listed. Some unnamed segments, such as ramps or unlabeled carriageways, may carry as much traffic as the roads shown.

Cars and light vehiclesTrucks
1US 20Motorway · 33,806vehicles2,762trucks · 8.2%
Road class
Motorway
Median trip time
34.3 min
Drivers’ median age
35.3 yrs
Drivers’ average income
$72,155

US 20 carries 11.9 times the county average at its busiest, 2,762 of them trucks (8.2%, in line with the county-wide 8.4%).

2East 1st SouthSecondary road · 14,798vehicles691trucks · 4.7%
Road class
Secondary road
Congestion ratio
33.2%
Median trip time
28.2 min
Drivers’ median age
40.8 yrs
Drivers’ average income
$82,318

East 1st South is one of the more congested roads here: trips take 33% longer than at free-flow speed, against 8% county-wide.

3West 1st SouthSecondary road · 12,937vehicles534trucks · 4.1%
Road class
Secondary road
Congestion ratio
28.9%
Median trip time
33.0 min
Drivers’ median age
39.3 yrs
Drivers’ average income
$82,663

On its busiest stretch, West 1st South carries 4.5 times the county average; trucks are 4.1% of it, below the county-wide 8.4%.

4Farnsworth WaySecondary road · 12,243vehicles539trucks · 4.4%
Road class
Secondary road
Congestion ratio
29.7%
Median trip time
26.5 min
Drivers’ median age
36.3 yrs
Drivers’ average income
$75,483

Delays build on Farnsworth Way: its congestion ratio of 30% over free-flow time is well above the county's 8%.

5State StreetSecondary road · 10,109vehicles479trucks · 4.7%
Road class
Secondary road
Congestion ratio
23.5%
Median trip time
32.3 min
Drivers’ median age
41.6 yrs
Drivers’ average income
$79,932

State Street peaks at 10,109 vehicles a day, 3.5 times the county average; trucks are 4.7% of it, below the county-wide 8.4%.

Ranked by trucks per day

Only named roads are listed. Some unnamed segments, such as ramps or unlabeled carriageways, may carry as much traffic as the roads shown.

Cars and light vehiclesTrucks
1US 20Motorway · #1 by traffic33,806vehicles2,762trucks · 8.2%
2East 1st SouthSecondary road · #2 by traffic14,798vehicles691trucks · 4.7%
3I 15Motorway · 3,628vehicles561trucks · 15.5%
Road class
Motorway
Congestion ratio
4.4%
Median trip time
48.1 min
Drivers’ median age
42.1 yrs
Drivers’ average income
$69,367

At 27% more than the county average, I 15 draws drivers from neighborhoods averaging $69,367 in household income.

4Farnsworth WaySecondary road · #4 by traffic12,243vehicles539trucks · 4.4%
5West 1st SouthSecondary road · #3 by traffic12,937vehicles534trucks · 4.1%
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, Idaho.

Need segment-level traffic data?

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