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 our bail bonds office in Brea 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 traveling, 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 bail bonds 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 recognizance 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 misdemeanors — 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.

The full Diamond Bar bail resource network

Most bail websites give you a phone number and nothing else. Below is everything that actually governs a Diamond Bar case — where the person is held and for how long, where the bail figure comes from, and the process that controls when they walk out.

Where a Diamond Bar arrest is held, and for how long

The Board of State and Community Corrections classifies the LASD Walnut Station Jail (facility 1850) as Type I. Under Title 15 § 1006 that means not more than 96 hours, excluding holidays, after booking. The J suffix is the part almost no bail site explains: it means the facility is separately approved to hold minors, and a minor held there is not in the adult bail system at all — there is usually no bail amount to post.

Los Angeles County sets bail differently — and that changes what you should do first

This is the single most important thing to understand about a Diamond Bar arrest. Los Angeles County releases many non-violent, non-serious arrests before arraignment at $0 bail, with no bond and no premium. It also publishes no inmate record at all for roughly the first two hours after an arrest, so an empty search result usually means the booking is not finished — not that the person was released or taken elsewhere. Paying anyone before you know which category the case falls into is how people spend money they did not need to spend.

The clock, hour by hour

Before you pay anyone

Where a Diamond Bar case is heard

Court assignment follows the city of arrest and the charge that is ultimately filed, and the Los Angeles County Superior Court publishes no public city-by-city criminal assignment table. We will not guess at yours: the release paperwork names the actual courthouse, date and time, and that document governs. Use it, and check the date independently before relying on anything else.

See every Los Angeles County courthouse we cover, how to find a court date, and what happens if that date is missed.

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 license 1841014.

Domestic violence bail in Diamond Bar

Domestic violence is the one charge type where the timing rules genuinely change. Penal Code § 1270.1 requires a hearing in open court before release on own recognizance or at any figure other than the published scheduled amount — which in practice means posting the scheduled amount can happen at any hour, while asking a judge to lower it waits for a court day.

Our domestic violence bail page covers the current scheduled amounts, the protective order that begins at release, and the second-arrest trap under PC 273.6. Charge-specific detail is on PC 273.5 and PC 243(e)(1).

Diamond Bar is served by the Sheriff’s Walnut/Diamond Bar Station, the same station covering Rowland Heights and Walnut. Our closest 24-hour offices are Brea and La Habra, both a straightforward drive, with Anaheim behind them. We post bail across Los Angeles County and Orange County.