Diamond Bar sits at the far eastern edge of Los Angeles County, right where the 57 and 60 freeways cross. Roughly 55,000 people live here, and the city’s position produces the single most important question on a Diamond Bar call.

Which county is this?

Diamond Bar borders San Bernardino County to the east and Orange County to the south. An arrest a short distance in either direction lands in an entirely different system — different sheriff, different jails, different courthouse, and a different bail schedule.

The contrast is sharp. Los Angeles County has applied Pre-Arraignment Release Protocols since October 2023, removing money bail from many non-violent, non-serious cases. Orange County still runs a uniform countywide bail schedule under Penal Code section 1269b, where posting the scheduled amount is often the fastest lawful route out. Same conduct, a few miles apart, genuinely different answers.

We work Los Angeles and Orange counties daily, and our Brea office sits just south of Diamond Bar over the Orange County line — which is why this city is straightforward for us.

Who makes the arrest

Diamond Bar has no police department of its own. It contracts its law enforcement to the Los Angeles County Sheriff’s Department, policed from the Walnut/Diamond Bar Station, 21695 E. Valley Boulevard, Walnut, CA 91789. The station publishes a line badged for this city — Diamond Bar (626) 913-1715 — alongside its Walnut line, (909) 595-2264.

The Sheriff lists that station as serving the City of Walnut, the City of Diamond Bar, Rowland Heights, and the unincorporated areas of Covina Hill and West Covina.

The Sheriff provides patrol services to 153 unincorporated communities and 42 of the county’s 88 cities. There is no city jail here, so deputies handle the arrest from the outset and the route runs into county custody.

Where someone is held

Los Angeles County books men and women into different facilities, which is one reason families are told there is no record of their relative. Men are processed at the Inmate Reception Center in downtown Los Angeles — 24-hour intake (213) 473-6080. Women are held at the Century Regional Detention Facility, 11705 S. Alameda Street, Lynwood — (323) 568-4500. Our find an inmate guide explains how to search each system.

Which courthouse

• Superior Court of Los Angeles County, East District
• District courthouses: West Covina, Pomona South and El Monte

Confirm the specific courthouse against your paperwork before travelling, or ask us to check.

Our nearest office to Diamond Bar

American Freedom Bail Bonds has no Los Angeles County office. Our three physical offices are Anaheim, Brea and La Habra, all in Orange County. Diamond Bar is a service area we cover from our Brea office, which is the closest of the three — immediately south over the Orange County line, straight down the 57. Our La Habra office sits a little further west, directly on the county line. Because we work both sides of that line, we can tell you which county’s system applies before you set off, and an agent can meet you at the jail or the courthouse rather than at an office.

Charges we are called about

• Warrants — in Los Angeles County a warrant is one of the situations where a bond is genuinely required, because the release protocols address arrest without a warrant.
• Domestic violence — Penal Code section 1270.1 requires a hearing in open court, on two court days’ written notice, before release on own recognisance or at a non-schedule amount for certain of these charges.
• Felony charges — where the serious-or-violent test decides whether the protocols apply at all.
• DUI, drug charges and misdemeanours — frequently within the protocols, so ask before assuming.
• All bail services and payment plans.

Nearby areas we serve

• Walnut — to the west, same sheriff’s station
• Rowland Heights — to the west, same station
• Pomona — to the north, own police department
• Brea — our office, south over the Orange County line

See also Los Angeles County bail bonds and our service areas.

Common questions

Is this Los Angeles, San Bernardino or Orange County?

Whichever agency made the arrest settles it. Los Angeles County Sheriff’s deputies from Walnut/Diamond Bar Station means an LA County case. An agency east or south of the line means a different county with its own courts, jails and bail schedule. Tell us where it happened.

Does the county change whether we need a bond?

Substantially. LA County’s protocols remove money bail from many non-violent, non-serious cases. Orange County does not work that way. It is one of the biggest practical differences in Southern California right now.

Where is my relative held?

For an LA County arrest, county custody — Inmate Reception Center for men, Century Regional in Lynwood for women. Diamond Bar has no city jail.

Which courthouse?

East District — Pomona South, West Covina or El Monte.

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Please note: American Freedom Bail Bonds is a licensed bail bond agency, not a law firm. Nothing on this page is legal advice, and we cannot guarantee a bail amount, a release time, eligibility for release, or the outcome of any case. Los Angeles County release rules changed substantially in October 2023, and court and jail information can change — always confirm details directly with the facility or the court. California bail licence 1841014.