Trucking Companies in Diamond Bar, CA
Diamond Bar, CA has 158 registered for-hire trucking companies as of June 2026, making it one of California's largest carrier markets by operating authority count. This figure includes active, inactive, and revoked authorities tracked by the Federal Motor Carrier Safety Administration (FMCSA).
Source: FMCSA operating authority and compliance records. Truck Graph analysis. View methodology
Fleet size and equipment distribution
158 carriers broken down by power-unit count and operation type in Diamond Bar, CA.
Fleet size distribution
By registered power-unit count. Source: FMCSA carrier census. View methodology
Operation type breakdown
Classification by carrier operation type and hazmat endorsement status. View methodology
About the Diamond Bar, CA freight market
Diamond Bar, CA is home to 158 registered for-hire motor carriers, of which 158 (100.0%) hold active operating authority as of June 2026. According to FMCSA records, the average fleet size among Diamond Bar carriers is 2.2 power units, reflecting a market dominated by owner-operators and small fleets. The Diamond Bar carrier population contributes to California's broader freight economy, which the Bureau of Labor Statistics ranks among the nation's largest by trucking employment.
The fleet composition in Diamond Bar shows 219 single-truck operators (138.6% of all carriers) alongside 0 carriers operating fleets of 101+ power units. Other operations represent the largest segment with 266 carriers. This distribution is consistent with FMCSA's national pattern where approximately 91% of registered carriers operate fewer than 6 power units (FMCSA Industry Snapshot, 2024).
Authority tenure data reveals 18 carriers received new operating authority in the past 6 months, while 7 carriers have maintained continuous authority for 20+ years. New entrants face elevated scrutiny under FMCSA's New Entrant Safety Assurance Program, which mandates an 18-month monitoring period including at least one safety audit. The presence of 3 carriers with prior revocations on record underscores the importance of verifying authority status before tendering freight — a carrier's historical compliance record is publicly available through the FMCSA SAFER System.
Truck Graph identifies 3 active risk indicators among Diamond Bar carriers (1.90% of the population), flagged through cross-referencing authority history, insurance filing patterns, and known chameleon carrier behaviors. The FMCSA defines chameleon carriers as entities that "successively obtain and relinquish operating authority to evade enforcement actions." Shippers and brokers should verify carrier authority, insurance coverage, and safety ratings before every load tender — Truck Graph's Risk Check tool provides instant verification against all available compliance data.
Sources: FMCSA.dot.gov, BLS Trucking Industry Data, FMCSA SAFER System. Data verified as of .
Authority age distribution
Years since initial FMCSA authority grant date. View methodology
Risk and compliance overview
Risk indicators and fleet composition across 158 Diamond Bar carriers.
Fleet size vs carrier count
Carrier population by fleet tier. Source: FMCSA census data. View methodology
Equipment type share
Based on operation type classification and endorsements. View methodology
All Diamond Bar carriers — complete directory
23 safe-to-tender carriers · 1 pages · Sorted by fleet size.
| # | Carrier | City | DOT # | Fleet | Auth. age | Type | Safety | Status |
|---|---|---|---|---|---|---|---|---|
| 01 | A & G Express Transport INC Diamond Bar, CA | MC423037 | 886349 | 3 | 26 yr | Dry van | 0 | Active |
| 02 | Hynj Transport INC Diamond Bar, CA | MC1401000 | 3847051 | 2 | 4 yr 2 mo | Dry van | 0 | Active |
| 03 | Bonroy Transportation INC Diamond Bar, CA | MC37689 | 3027544 | 1 | 8 yr 11 mo | Dry van | 0 | Active |
| 04 | Silverbear Freight Diamond Bar, CA | MC1763615 | 4469215 | 1 | 8 mo | Dry van | 0 | Active |
| 05 | Flc Transportation INC Diamond Bar, CA | MC58532 | 3066745 | 1 | 8 yr 7 mo | Dry van | 0 | Active |
| 06 | Dawning Express INC Diamond Bar, CA | MC912767 | 2597261 | 1 | 11 yr 2 mo | Dry van | 0 | Active |
| 07 | Y&Z Forward Trucking INC Diamond Bar, CA | MC1054458 | 3316478 | 1 | 6 yr 10 mo | Dry van | 0 | Active |
| 08 | Old Boy Trucking Diamond Bar, CA | MC1013251 | 3231483 | 1 | 7 yr 4 mo | Dry van | 0 | Active |
| 09 | Alba Auto Carriers INC Diamond Bar, CA | MC1074782 | 3357913 | 1 | 6 yr 6 mo | Dry van | 0 | Active |
| 10 | Avg Trucking INC Diamond Bar, CA | MC116476 | 3168647 | 1 | 7 yr 10 mo | Dry van | 0 | Active |
| 11 | Dsx Transport INC Diamond Bar, CA | MC118302 | 3170956 | 1 | 7 yr 10 mo | Dry van | 0 | Active |
| 12 | Olivia Worldwide LLC Diamond Bar, CA | MC1585964 | 4138050 | 1 | 2 yr 8 mo | Dry van | 0 | Active |
| 13 | Yongliang Technology INC Diamond Bar, CA | MC1374047 | 3793299 | 1 | 4 yr 5 mo | Dry van | 0 | Active |
| 14 | Hr Global Express Diamond Bar, CA | MC1777132 | 4494462 | 1 | 6 mo | Dry van | 0 | Active |
| 15 | Sean Park Diamond Bar, CA | MC708598 | 2009801 | 1 | 16 yr 2 mo | Dry van | 0 | Active |
| 16 | Gwq Trucking INC Diamond Bar, CA | MC761218 | 2193290 | 1 | 14 yr 8 mo | Dry van | 0 | Active |
| 17 | Ace Way Transportation INC Diamond Bar, CA | MC1136330 | 3471407 | 1 | 5 yr 9 mo | Dry van | 0 | Active |
| 18 | Michael A Favela Diamond Bar, CA | MC479483 | 1205163 | 1 | 22 yr 4 mo | Dry van | 0 | Active |
| 19 | Zhicheng Transport INC Diamond Bar, CA | MC1751608 | 4446567 | 1 | 10 mo | Dry van | 0 | Active |
| 20 | Aram Doumany Transportation LLC Diamond Bar, CA | MC1688432 | 4325925 | 1 | 1 yr 6 mo | Dry van | 0 | Active |
| 21 | L & Y Dynamic Trucking INC Diamond Bar, CA | MC905258 | 2584055 | 1 | 11 yr 3 mo | Dry van | 0 | Active |
| 22 | Lj Global INC Diamond Bar, CA | MC1780991 | 4501721 | 1 | 6 mo | Dry van | 0 | Active |
| 23 | Lucky Feng INC Diamond Bar, CA | MC1712997 | 4372907 | 1 | 1 yr 3 mo | Dry van | 0 | Active |
Truck Graph carrier directory. Data from FMCSA operating authority records. View methodology
Find Diamond Bar carriers by equipment type
Browse specialized carriers operating in Diamond Bar, CA by trailer and equipment classification.
Explore the California carrier directory
Diamond Bar is one of the top freight markets in California. Browse the full California trucking company directory to find carriers across all cities, or return to the national carrier index to compare states.
Nearby freight markets in California
Diamond Bar trucking questions
Answers verified against FMCSA records.
How many trucking companies are in Diamond Bar, California?
Diamond Bar, CA has 158 registered for-hire motor carriers as of June 2026. Of these, 158 hold active operating authority from the FMCSA.
What is the average fleet size in Diamond Bar?
The average fleet size among Diamond Bar carriers is 2.2 power units. Approximately 219 carriers operate a single truck, while 0 operate fleets of 101+ units.
How many Diamond Bar carriers have risk indicators?
Truck Graph identifies 3 active risk indicators among Diamond Bar-based carriers. These indicators are derived from authority history patterns, insurance filing anomalies, and known chameleon carrier behaviors.
How do I verify a Diamond Bar trucking company?
Use Truck Graph's DOT Lookup tool to instantly verify any carrier's authority status, insurance coverage, and safety record. You can also check the FMCSA SAFER System directly at safer.fmcsa.dot.gov.
What types of trucking companies operate in Diamond Bar?
Diamond Bar's carrier population includes other, dry van / mixed operations. The market serves general freight, specialized, and regional distribution needs.
Is Truck Graph data reliable?
Truck Graph compiles data from FMCSA authority records, insurance filings, inspection histories, and crash reports. Data refreshes continuously from verified federal sources. All 158 Diamond Bar carriers are cross-referenced against multiple compliance databases.
For journalists and researchers
Truck Graph data is open and citable. For press inquiries, contact our editorial team.