Fleet Classification, also called Fleet Size Code in FMCSA's data, is a letter-coded bucket FMCSA assigns to a carrier based on its total reported power units, ranging from A (1 truck) through Z (over 5,000 trucks), with each letter representing a range. This gives a quick, standardized way to categorize carriers by scale without needing to compare raw numbers — informally, this often gets collapsed into plainer labels like "owner-operator" (1 truck), "small carrier" (roughly 2-10 trucks), "mid-size carrier," and "large carrier" for the biggest fleets. Fleet classification is a useful quick filter when researching a company: a one-truck operation and a 500-truck fleet face very different operational realities, risk profiles, and often service expectations, even if their FMCSA compliance records look superficially similar. Because the underlying power-unit count comes from a carrier's self-reported, only-biennially-updated MCS-150 filing, the classification is a reasonable approximation of current fleet size rather than a guaranteed-current figure.
A carrier classified as 'Small carrier (1-10 units)' is a fundamentally different kind of business than one in FMCSA's largest fleet-size brackets, even if both have clean safety records.
Shown as 'Fleet class' in the Fleet Profile section of every carrier profile.