The 100 Largest Trucking Companies in Montana (2026)

Nightly aggregation of the FMCSA census puts Montana at 9,037 active motor carriers running roughly 64,818 power units combined, and about 46% of those carriers are single-truck owner-operators. Average active fleet size works out to 7.8 trucks.

65 new MT carrier registrations appeared in the last 90 days — and 95 registrations carry an FMCSA prior-revocation link, the raw material of chameleon re-registrations.

NORTHWESTERN CORPORATION out of BUTTE tops the MT ranking with 841 power units on its latest MCS-150. Its complete vetting workup — risk flags, score breakdown, insurance filings, and record timeline — is at https://mclookup.com/carrier/410856.

The list orders every carrier headquartered in MT by self-reported power units, filtered for plausibility (a driver-to-truck ratio between 0.3 and 5.0 screens out data-entry junk like thousand-truck fleets with zero drivers). Showing the top 100 of 1,955 qualifying carriers; every row links to that carrier's full public record.

Yes — this page only surfaces the largest fleets. Any of the 1,955 registered MT carriers can be pulled up by typing its USDOT or MC number into the search bar, which returns the same risk-flag screening, score breakdown, and month-over-month record history.