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Traffic heat map of Brown County, South Dakota: 554 miles of roads shaded from blue (light) to red (heavy traffic), busiest on 6th Avenue Southeast

Brown County, South Dakota Traffic Counts

It ranks among the top 3 counties in South Dakota for average daily traffic. This page breaks down traffic in Brown County, South Dakota across 554 miles of monitored roads split into 3,963 segments, using multi-sourced mobile and sensor data. It goes beyond raw counts to truck flow, congestion and who is driving, so site selection and route planning rest on evidence.
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 Brown County, South Dakota

Traffic

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

vehicles per day5,442
Trucks

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

6.9%
Average travel time

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

34.1 min
Drivers’ average age

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

47.4 yrs
Drivers’ average income

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

$74,410

Our data shows 5,442 vehicles per day on the average road in Brown County, South Dakota, and 1,082,634 vehicle-miles traveled per day (≈395 million per year) across its 554 miles of monitored roads. About 1 in 15 vehicles is a truck, fewer than the 1 in 10 across South Dakota.

Busier roads than 97% of counties in South Dakota

Brown sees 72% higher average daily traffic volume than the state average (5,442 vehicles per day against 3,156), suggesting more demand on each road - heavy exposure for roadside retail, and tight road space for deliveries. In total volume terms, its road network carries about 4.4% of South Dakota's statewide total of vehicle-miles. Brown carries more traffic than 97% of counties in South Dakota.

The average trip takes 34.1 minutes, on par with the state level. On travel time, Brown runs shorter than 66% of counties in South Dakota.

Highway vs. Non-Highway Traffic Analysis

highway traffic icon

Highway Traffic in Brown County, South Dakota

Trafficvehicles per day12,434
Trucks9.1%
Average travel time32.2 min
Drivers’ average age48.2 yrs
Drivers’ average income$75,010

Travel in Brown County, South Dakota splits roughly evenly, with about half of it (46% of vehicle-miles) on highways. The average highway carries 12,434 vehicles per day, 194% more than the average non-highway road in the same area, which carries 4,236 vehicles per day.

With 24% of the road miles (133 miles in 583 segments), highways punch above their length, carrying 502,186 vehicle-miles traveled per day (≈183 million per year).

85% of counties in South Dakota move less traffic on their highways.

Lower highway truck share than 98% of counties in South Dakota

The concentration of trucks on highways (9.1%) is 33% lower than the state average for similar road classifications. 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 South Dakota. By raw truck volume, Brown carries more highway trucks than 54% of counties in South Dakota.

non-highway traffic icon

Non-highway Traffic in Brown County, South Dakota

Trafficvehicles per day4,236
Trucks5.0%
Average travel time34.4 min
Drivers’ average age46.8 yrs
Drivers’ average income$73,932

Travel in Brown County, South Dakota splits roughly evenly, with about half of it (54% of vehicle-miles) on local roads. The average non-highway road carries 4,236 vehicles per day.

Spread over 421 miles and 3,380 segments, 76% of the road network, local roads carry a lighter load per mile: 580,448 vehicle-miles traveled per day (≈212 million per year). Trucks make up 5.0% of non-highway traffic, about 1 in 20 vehicles.

Younger drivers than 75% of counties in South Dakota

The concentration of trucks on non-highway roads is 45% lower than on highways.

Trip origins here have higher average income than 65% of counties in South Dakota. The driver population here skews younger than 75% of counties in South Dakota.

Time-of-Day & Seasonal Patterns

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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 63% higher than the daily average.
Weekend traffic:
Weekends are much quieter: volumes run about 25% below weekday levels, the signature of a commute-driven road network.
seasonal traffic icon
Seasonal Fluctuation
Busy season:
May–July is the high season, with volumes +11% versus the annual average.
Lowest month:
March is the quietest month, with volumes -16% versus the annual average.

Data Finding: Hourly & Seasonal Patterns

In Brown County, South Dakota, the peak hour concentrates about 7% of the day's traffic, and there is a strong seasonal swing of +11% in high season.

Brown County vs. South Dakota Traffic Comparison

Of the four measures, average daily traffic per road differs most: Brown County runs 72% above the South Dakota average. Its highway truck share, by contrast, is 33% below.

MetricBrown CountySouth Dakota averageDifference
Traffic5,4423,156+72.4%
Truck % (Total Traffic)6.9%10.3%-33.0%
Truck % (Highway)9.1%13.6%-33.4%
Avg. Travel Time34.1 min32.5 min+5.0%

How Brown County compares

Brown County has the busiest roads among its nearby counties

Against the 4 nearest areas, Brown County carries 501.8% more traffic on a typical road and moves 6.6 times the total daily travel; 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.

Brown County and the 4 nearest county-level areas by centroid distance, with the South Dakota average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Brown County5,4426.9%1,082,63434.1 minN/A
Dickey County, North Dakota90410.7%111,39637.5 min5.3%
Day County, South Dakota95111.2%204,38542.5 minN/A
Marshall County, South Dakota5799.0%77,51730.9 minN/A
Spink County, South Dakota1,18210.9%267,16237.9 minN/A
South Dakota average3,15610.3%N/A32.5 min12.9%

Brown County ranked within South Dakota

Brown County sits in South Dakota's top three on average daily traffic volume.

Brown County ranked among 66 county-level areas in South Dakota (1 = highest); measures without data in every county rank a smaller field, down to 49.
MeasureBrown CountySouth Dakota rank
Traffic volume (AADT)5,442#3 of 66
Highway vehicle-miles per day502,186#8 of 49
Truck share on highways9.1%#48 of 49
Highway trucks per day1,125#23 of 49
Average travel time34.1 min#44 of 66
Average driver income$74,410#24 of 66
Average driver age47.4 yrs#50 of 66

The two ends of this table sit far apart: #3 of 66 on average daily traffic volume, against #48 of 49 on truck share on highways.

Busiest roads in Brown County, South Dakota

On their busiest stretches, the three busiest roads in Brown County carry 21,558 vehicles a day on average, 4.0 times the typical road in the county (5,442).

6th Avenue Southeast is the busiest road, at 27,181 vehicles a day, 1,435 of them trucks (5.3%). It also carries the most trucks.

Trips using 1st Avenue Southeast are long: a median of 63.6 minutes against 34.1 county-wide, the mark of a through route.

1st Avenue Southeast draws drivers from lower-income areas: their neighborhoods average $50,704 in household income, 32% below the county's $74,410.

Few trucks use Roosevelt Street: 2.8% of its traffic, under half the county's 6.9%.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
16th Avenue SoutheastTrunk road · 27,181vehicles1,435trucks · 5.3%
Road class
Trunk road
Median trip time
31.0 min
Drivers’ median age
48.1 yrs
Drivers’ average income
$67,645

The busiest stretch of 6th Avenue Southeast carries 5.0 times the county average; trucks are 5.3% of it, below the county-wide 6.9%.

22nd StreetPrimary road · 20,966vehicles1,018trucks · 4.9%
Road class
Primary road
Median trip time
29.0 min
Drivers’ median age
47.0 yrs
Drivers’ average income
$66,367

On its busiest stretch, 2nd Street carries 3.9 times the county average; trucks are 4.9% of it, below the county-wide 6.9%.

3Roosevelt StreetTertiary road · 16,526vehicles466trucks · 2.8%
Road class
Tertiary road
Median trip time
27.4 min
Drivers’ median age
46.9 yrs
Drivers’ average income
$80,470

Roosevelt Street peaks at 16,526 vehicles a day, 3.0 times the county average; trucks are 2.8% of it, below the county-wide 6.9%.

46th Avenue SouthwestTrunk road · 15,818vehicles1,075trucks · 6.8%
Road class
Trunk road
Median trip time
32.9 min
Drivers’ median age
47.2 yrs
Drivers’ average income
$70,234

6th Avenue Southwest carries 2.9 times the county average at its busiest, 1,075 of them trucks (6.8%, in line with the county-wide 6.9%).

51st Avenue SoutheastTertiary road · 15,433vehicles622trucks · 4.0%
Road class
Tertiary road
Median trip time
63.6 min
Drivers’ median age
45.9 yrs
Drivers’ average income
$50,704

1st Avenue Southeast carries 2.8 times the county average on its busiest stretch, where the median trip lasts 63.6 minutes.

Ranked by trucks per day

Cars and light vehiclesTrucks
16th Avenue SoutheastTrunk road · #1 by traffic27,181vehicles1,435trucks · 5.3%
26th Avenue SouthwestTrunk road · #4 by traffic15,818vehicles1,075trucks · 6.8%
32nd StreetPrimary road · #2 by traffic20,966vehicles1,018trucks · 4.9%
41st Avenue SoutheastTertiary road · #5 by traffic15,433vehicles622trucks · 4.0%
5US 12Trunk road · 6,026vehicles598trucks · 9.9%
Road class
Trunk road
Median trip time
39.8 min
Drivers’ median age
49.9 yrs
Drivers’ average income
$78,438

US 12 carries 11% more than the county average on its busiest stretch, where the median trip lasts 39.8 minutes.

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

BrownDepartment 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 Brown County

The same traffic breakdown for the areas closest to Brown County, South Dakota.

Need segment-level traffic data?

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