Private Investigators Private Detectives locations near Diamond Bar, CA

Showing 1–10 of 10 results

Diamond Bar, CA has 10 private investigators private detectives listings across 7 ZIP codes. Details on this page were last refreshed Jul 2026.

Kindergarten Ranch School

Private Secondary Schools

📍 20505 E Covina Hills Rd, Covina, CA, 91724

📞 626-339-5352

Prep. School for Cultural Literacy, From Pre-school thru 4th grade, current events, geography, classical music concerts, cutting edge science, Beautiful gardens, farm animals and Twenty Field trips, summer school programs available for all ages. Snacks provided. Learning languages, 20 field trips a year. Latin, Spanish, French, German, Polish, Russian and Ukrainian, English.

Updated Jul 2026

Starside Security & Investigation, Inc

Security Guard & Patrol Services

📍 1930 S Brea Canyon Rd Ste 220, Diamond Bar, CA, 91765

📞 909-396-9999

🌐 starside.com

Starside's Private Investigators and Security professionals are fully licensed and insured. Starside is available nationwide.

Cyclone Private Postal

Mailing Services

📍 23441 Golden Springs Dr, Diamond Bar, CA, 91765

📞 909-860-4900

GMD Confidential Services

Private Investigators & Private Detectives

📍 Serving Your Area, Brea, CA, 92821

📞 714-529-2967

O&o Investigations

Private Investigators & Private Detectives

📍 310 N Indian Hill Blvd Ste 449, Claremont, CA, 91711

📞 866-667-1231

🌐 www.ocprivateinvestigator.com

At O&O Investigations, our clients come first. We offer professional private investigation services to individuals, attorneys, businesses and insurance