
Total Traffic Volume & Performance in St. Charles County, Missouri
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day12,653 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 6.2% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 29.1 min |
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Congestion ratio The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 32.7% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 46.8 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $105,931 |
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The average monitored road in St. Charles County, Missouri carries 12,653 vehicles per day. Across its 831 miles of monitored roads, that adds up to 11,743,703 vehicle-miles traveled per day (≈4.3 billion per year). Trucks are a smaller part of the mix than across Missouri: 6.2% against 9.8%.
The busiest roads of any county in Missouri
At 12,653 vehicles per day, the average monitored road in St. Charles carries 125% more traffic than the state average of 5,631, suggesting more demand on each road - prime passing trade for storefronts, with more competition for road space. Across the whole network, that travel is about 6.8% of Missouri's statewide total. In fact, St. Charles has the highest average traffic volume of any county in Missouri, at 12,653 vehicles per day.
Journey times run 7% lower than the state level, at 29.1 minutes on average. On travel time, St. Charles runs shorter than 89% of counties in Missouri.
At 68% higher than the state level, the 32.7% congestion ratio signals more pronounced congestion - peak-hour routing and delivery windows need real slack here.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in St. Charles County, Missouri
| Traffic | vehicles per day33,555 |
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| Trucks | 8.9% |
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| Average travel time | 33.5 min |
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| Congestion ratio | 58.6% |
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| Drivers’ average age | 46.6 yrs |
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| Drivers’ average income | $102,863 |
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Travel in St. Charles County, Missouri splits roughly evenly, with about half of it (50% of vehicle-miles) on highways. The average highway carries 33,555 vehicles per day, 182% more than the average non-highway road in the same area, which carries 11,880 vehicles per day.
Highways make up 20% of the monitored road miles (167 miles, 694 segments), so they carry more than their share: 5,923,696 vehicle-miles traveled per day (≈2.2 billion per year).
That puts St. Charles among the top 3 counties in Missouri for highway travel volume.
Lower highway truck share than 97% of counties in Missouri
At 8.9%, highway truck share is 34% lower than the state average. Trucks are a small share of a very large highway flow, so St. Charles still moves heavy freight volumes alongside its passenger traffic.
97% of counties in Missouri see a higher highway truck share than St. Charles's 8.9%. 90% of counties in Missouri see fewer highway trucks per day than St. Charles's roughly 2,996.

Non-highway Traffic in St. Charles County, Missouri
| Traffic | vehicles per day11,880 |
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| Trucks | 3.5% |
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| Average travel time | 29.0 min |
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| Congestion ratio | 31.7% |
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| Drivers’ average age | 46.9 yrs |
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| Drivers’ average income | $108,985 |
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Travel in St. Charles County, Missouri splits roughly evenly, with about half of it (50% of vehicle-miles) on local roads. The average non-highway road carries 11,880 vehicles per day.
Spread over 664 miles and 18,781 segments, 80% of the road network, local roads carry a lighter load per mile: 5,820,006 vehicle-miles traveled per day (≈2.1 billion per year). The truck share on non-highway roads is 3.5%.
The highest driver income of any county in Missouri
The concentration of trucks on non-highway roads is 61% lower than on highways.
The non-highway congestion ratio of 31.7% is 70% higher than the state level, suggesting slower local mobility than the state average.
St. Charles also has the highest average driver income in Missouri among trip origins - $105,931. St. Charles's median driver age is lower than 79% of counties in Missouri.