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24 firms listed · 6 in Diamond Bar · 4 open 24/7 · 8 open weekends · 18 rated 4.5+
Data verified October 18, 2026
These 24 firms listed for Diamond Bar, CA handle immigration matters for people and employers. What each states about case types, accreditation and languages spoken comes from its own website; ratings and quotes come from public reviews.
6 of the 24 firms we list are based in Diamond Bar; the other 18 serve Diamond Bar from towns including Fullerton (10 mi), Orange (13 mi) and Rancho Cucamonga (17 mi). The firms on this page are rated from 4.0 to 5.0 across 3,352 reviews; 13 have 50 or more reviews and 18 are rated 4.5 or higher. When clients rate these firms on specific qualities, they most often praise professionalism (94%), quality (79%) and responsiveness (77%). 4 are open around the clock; 8 are open on Saturdays and 4 on Sundays. The practice areas the firms on this page list most often on their websites are family law (3), asylum (2), bankruptcy (2), car accidents (2) and civil litigation (2). 5 have a BBB rating of A or A+. Domain records put 18 websites of the firms on this page at ten or more years old; the oldest dates from 2002. 4 offer urgent consultations; 1 offers payment plans; 9 offer a free initial consultation; 1 is family- or locally-owned and 1 lists coupons or special offers. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book a consultation.
4 of the 24 immigration firms here take bookings on their own site. It suits this work, since a first consultation is usually a paid assessment of your options rather than a sales call. Check what the slot costs and how long it runs before you reserve one.
