850 Diamond Bar businesses across 39 trades and services — phone numbers, 213 email addresses and Google ratings.
| Trade | Businesses | With email | Avg rating | No website |
|---|---|---|---|---|
| Restaurants | 98 | 14 | — | 45 |
| Real estate offices | 91 | 17 | — | 19 |
| Salons and spas | 71 | 18 | — | 27 |
| Financial advisors and lenders | 58 | 19 | — | 16 |
| Law firms | 56 | 23 | — | 16 |
| Construction companies | 52 | 14 | — | 16 |
| Dental clinics | 44 | 18 | — | 10 |
| Medical clinics | 43 | 12 | — | 15 |
| Consultants | 35 | 12 | — | 15 |
| Insurance agencies | 33 | 9 | — | 5 |
| Daycares, tutors and schools | 32 | 10 | — | 9 |
| Auto repair shops | 28 | 10 | — | 16 |
| Cafes and bakeries | 26 | 2 | — | 15 |
| Gyms and fitness studios | 24 | 8 | — | 3 |
| Accounting firms | 23 | 5 | — | 9 |
| Marketing agencies | 17 | 4 | — | 6 |
| Senior care providers | 16 | 4 | — | 3 |
| IT service companies | 15 | 5 | — | 7 |
| Bars and breweries | 11 | 2 | — | 8 |
| Painting companies | 9 | 1 | — | 4 |
| HVAC companies | 8 | 3 | — | 1 |
| Vets and pet businesses | 8 | 2 | — | 4 |
| Plumbing companies | 7 | 0 | — | 4 |
| Electrical contractors | 7 | 0 | — | 3 |
| Software companies | 7 | 1 | — | 2 |
| Car dealerships | 6 | 3 | — | 2 |
| Staffing agencies | 6 | 1 | — | 0 |
| Home service businesses | 6 | 0 | — | 5 |
| Landscaping companies | 5 | 0 | — | 4 |
| Cleaning companies | 5 | 0 | — | 2 |
| Moving and storage companies | 4 | 1 | — | 2 |
| Event and wedding businesses | 4 | 0 | — | 0 |
| Roofing companies | 3 | 1 | — | 1 |
| Pest control companies | 3 | 0 | — | 0 |
| Optometrists and optical shops | 3 | 2 | — | 1 |
| Hotels and inns | 3 | 1 | — | 1 |
| Car washes and detailers | 2 | 1 | — | 0 |
| Photographers | 2 | 0 | — | 2 |
| Barbershops | 1 | 0 | — | 1 |
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