Fleet Size Distribution in US Trucking

Trucking is often discussed as an industry of a few giant fleets, but the registration data tells a very different story: it's overwhelmingly an industry of very small operations, with a long thin tail of larger fleets on top. Here's the actual distribution across every active carrier in the FMCSA Company Census File.

How fleet size actually breaks down

Based on 2,233,509 active carriers. "Power units" is FMCSA's term for self-propelled commercial vehicles (trucks and tractors) a carrier operates — it doesn't include trailers.

The single-truck majority

64% of active carriers report either zero or one power unit. The "zero" group is real and worth explaining rather than dismissing as bad data: FMCSA registration doesn't require a carrier to currently operate a truck — it covers anyone authorized to, including carriers between equipment, newly registered businesses that haven't started hauling yet, and administratively active registrations tied to a business that has paused operations. Combined with the one-truck group, 91% of all active carriers report five power units or fewer — see Owner-Operator vs Fleet for what drives that concentration.

The long tail

At the other end, 8,548 carriers — a little over a third of one percent of the active total — report more than 100 power units. These are the fleets that dominate freight volume despite being a tiny fraction of the carrier count: a single 500-truck fleet moves as much freight, in raw capacity terms, as roughly 500 single-truck owner-operators, but shows up as one registration in the count above.

Why this shapes so much else about the industry

This distribution is the reason a "typical" trucking company is a poor mental model for industry-wide analysis — the median carrier and the median truck are answering different questions. It's also why safety and compliance data needs to be read at the carrier level rather than assumed from fleet size alone: a one-truck operation and a 500-truck fleet face the same FMCSA safety requirements, but very different practical realities in how they meet them. See How to Verify a Carrier Before Booking a Load for why fleet size alone isn't a reliable shortcut for vetting a specific carrier.