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Traffic heat map of Mariposa County, California: 207 miles of roads shaded from blue (light) to red (heavy traffic), busiest on Golden Chain Highway and 49

Mariposa County, California Traffic Counts

TrafficZoom tracks traffic on 207 road miles in Mariposa County, California, divided into 1,718 segments averaging 635 ft. Its busiest road, Golden Chain Highway, carries 11,104 vehicles a day, 4.4 times the average road. Built from cross-verified mobile and road-sensor data, these counts help you size up a retail site, plan logistics routes or assess infrastructure needs.
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 Mariposa County, California

Traffic

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

vehicles per day2,498
Trucks

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

8.9%
Average travel time

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

33.7 min
Congestion ratio

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

3.5%
Drivers’ average age

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

58.7 yrs
Drivers’ average income

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

$63,948

A typical monitored road in Mariposa County, California sees 2,498 vehicles per day, while its 207 miles of monitored roads together handle 395,324 vehicle-miles traveled per day (≈144 million per year). Trucks are 8.9% of traffic, close to the 7.8% across California.

Congestion 87% below the California average

Mariposa sees 80% lower average daily traffic volume than the state average (2,498 vehicles per day against 12,766), suggesting less demand on each road - quiet roads that suit freight movement more than drive-by retail. Network-wide, Mariposa accounts for less than 0.1% of California's statewide total of vehicle-miles. 91% of counties in California see more traffic than Mariposa's 2,498 vehicles per day.

At 33.7 minutes, the average travel time matches the state level closely. 53% of counties in California have a shorter average travel time than Mariposa's 33.7 minutes.

At 87% lower than the state level, the 3.5% congestion ratio signals smoother traffic flow - delays are rare enough to plan travel times almost to the minute.

Time-of-Day & Seasonal Patterns

Data Finding: Hourly & Seasonal Patterns

In Mariposa County, California, the peak hour concentrates about 8% of the day's traffic.

Mariposa County vs. California Traffic Comparison

Of the four measures, average daily traffic per road differs most: Mariposa County runs 80% below the California average.

MetricMariposa CountyCalifornia averageDifference
Traffic2,49812,766-80.4%
Truck % (Total Traffic)8.9%7.8%+14.5%
Avg. Travel Time33.7 min34.5 min-2.2%

How Mariposa County compares

Mariposa County is the least congested of its nearby counties

Compared with its 4 closest neighbours, Mariposa County is 82.2% less congested and moves 6.2% of the total daily travel; it has the quietest roads of the five. Less traffic and more room for it - the roads here run both quieter and freer than the areas around them.

Mariposa County and the 4 nearest county-level areas by centroid distance, with the California average for scale.
AreaAverage daily trafficTruck shareDaily vehicle-milesAverage travel timeCongestion ratio
Mariposa County2,4988.9%395,32433.7 min3.5%
Madera County, California5,37612.7%5,392,65337.0 min19.4%
Tuolumne County, California4,2846.5%1,187,91132.4 min15.5%
Merced County, California5,64816.6%7,127,20635.9 min15.7%
Stanislaus County, California10,3029.8%11,775,21533.1 min27.2%
California average12,7667.8%N/A34.5 min27.4%

Mariposa County ranked within California

On average driver age, Mariposa County is among the three highest county-level areas in California.

Mariposa County ranked among 58 county-level areas in California (1 = highest).
MeasureMariposa CountyCalifornia rank
Traffic volume (AADT)2,498#53 of 58
Average travel time33.7 min#28 of 58
Average driver income$63,948#56 of 58
Average driver age58.7 yrs#2 of 58

Mariposa County ranks #2 of 58 on average driver age but #56 of 58 on average driver income. The driver population here skews older and lower-income than most of California.

Busiest roads in Mariposa County, California

Traffic concentrates on a few corridors: the three busiest roads average 6,417 vehicles a day, against 2,498 on the average road in Mariposa County.

Golden Chain Highway leads with 11,104 vehicles a day, 690 of them trucks (6.2%). No other road comes close: 49, in second place, carries 4,220. It tops the truck ranking too, with the most trucks.

Drivers on Northside Drive are noticeably younger, with a median age of 39.7 against 58.7 across the county.

CA 140 carries longer journeys than most roads here, with a median trip of 54.3 minutes against 33.7 county-wide.

Ranked by daily traffic (AADT)

Cars and light vehiclesTrucks
1Golden Chain HighwayPrimary road · 11,104vehicles690trucks · 6.2%
Road class
Primary road
Median trip time
27.3 min
Drivers’ median age
59.8 yrs
Drivers’ average income
$73,376

At 4.4 times the county average, Golden Chain Highway draws drivers from neighborhoods averaging $73,376 in household income.

249Primary road · 4,220vehicles363trucks · 8.6%
Road class
Primary road
Median trip time
31.7 min
Drivers’ median age
60.3 yrs
Drivers’ average income
$77,249

49 peaks at 4,220 vehicles a day, 69% more than the county average; trucks are 8.6% of it, in line with the county-wide 8.9%.

3Northside DrivePrimary road · 3,927vehicles232trucks · 5.9%
Road class
Primary road
Median trip time
26.9 min
Drivers’ median age
39.7 yrs
Drivers’ average income
$48,756

Northside Drive carries 57% more than the county average at its busiest, 232 of them trucks (5.9%, below the county-wide 8.9%).

4Central Yosemite HighwayPrimary road · 3,433vehicles322trucks · 9.4%
Road class
Primary road
Median trip time
40.8 min
Drivers’ median age
60.4 yrs
Drivers’ average income
$62,928

Central Yosemite Highway carries 37% more than the county average on its busiest stretch, where the median trip lasts 40.8 minutes.

5CA 140Primary road · 3,390vehicles321trucks · 9.5%
Road class
Primary road
Median trip time
54.3 min
Drivers’ median age
59.1 yrs
Drivers’ average income
$53,207

At 36% more than the county average, CA 140 draws drivers from neighborhoods averaging $53,207 in household income.

Ranked by trucks per day

Cars and light vehiclesTrucks
1Golden Chain HighwayPrimary road · #1 by traffic11,104vehicles690trucks · 6.2%
249Primary road · #2 by traffic4,220vehicles363trucks · 8.6%
3Central Yosemite HighwayPrimary road · #4 by traffic3,433vehicles322trucks · 9.4%
4CA 140Primary road · #5 by traffic3,390vehicles321trucks · 9.5%
5Boot Jack - Ahwahnee RoadPrimary road · 2,656vehicles286trucks · 10.8%
Road class
Primary road
Median trip time
44.4 min
Drivers’ median age
60.5 yrs
Drivers’ average income
$64,173

Boot Jack - Ahwahnee Road carries through traffic: the median trip using it lasts 44.4 minutes, against 33.7 for the county.

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

MariposaDepartment 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 Mariposa County

The same traffic breakdown for the areas closest to Mariposa County, California.

Need segment-level traffic data?

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