Drive east on the 60 until the San Gabriel Valley starts climbing into hills, and you reach a city built on a cattle brand. The Taiwanese in Diamond Bar found their way here the way many families do: a good school district, a quiet cul-de-sac, a freeway that could carry you back to the noodle shops of Rowland Heights in ten minutes. They did not build a Little Taipei. They built something quieter, a hillside suburb where the high school graduating class is three-quarters Asian and the H Mart food court runs in Mandarin and Taiwanese on a Saturday afternoon.
The Place
Diamond Bar sits at the eastern edge of Los Angeles County, roughly 27 miles from downtown, where the San Gabriel Valley gives way to the foothills above Brea and Chino Hills. The city takes its name from the Diamond Bar Ranch, whose “diamond over a bar” cattle brand was registered in 1918 by rancher Frederic E. Lewis.
It is a planned community before it was a city. Transamerica Corporation bought the ranch in the 1950s and laid out one of the country’s early master-planned suburbs, with the first houses going up in 1959. Diamond Bar did not incorporate as a city until 18 April 1989, late enough that its Asian transformation was already well underway.
Today it is a city of about 55,000 spread across 14.88 square miles of hills, threaded by the SR-57 and SR-60 freeways that cross within its borders. The median household income runs above $106,000, and roughly six in ten residents are Asian American.
How It Became Taiwanese
To understand why Taiwanese families settled in Diamond Bar, you have to follow a migration that started fifteen miles to the west and moved steadily east, decade by decade, up the valley.
From Monterey Park, eastward
The first great Taiwanese landing in Greater Los Angeles was Monterey Park. After the Immigration and Nationality Act of 1965 reopened the door to immigrants from Asia, students and professionals from Taiwan began arriving, many staying on rather than returning to a homeland still under martial law. In the early 1970s the developer Frederic Hsieh marketed Monterey Park to them as a kind of Chinese Beverly Hills, and “Little Taipei” was born.
What happened next set the pattern for the whole region. As families prospered, they moved out of the first enclave in search of bigger houses, newer schools, and more space. They went to Arcadia and San Marino, then further east still, to Hacienda Heights, Rowland Heights, Walnut, and finally to the hills of Diamond Bar.
The professionals’ suburb
The Taiwanese who reached Diamond Bar in the 1980s and 1990s were, broadly, a settled middle class: engineers, accountants, doctors, small-business owners who had already done their first decade in America somewhere closer in. Diamond Bar offered what the inner valley could not, namely large hillside lots, a master-planned street grid, and a school district with a serious reputation.
They arrived during a window when immigration from Taiwan was actually slowing. Taiwan lifted martial law in 1987 and its economy boomed, so the families who came to Diamond Bar in these years were often consolidating rather than starting from nothing. This is part of why the city reads as comfortable rather than scrappy. It was settled by people who had already made their start.
A community measured in numbers
The census tells the story plainly. Diamond Bar is roughly 59 to 63 percent Asian depending on the year and the count, one of the most heavily Asian cities in Los Angeles County. The two largest immigrant origins are mainland China and Taiwan, with Taiwanese-born residents numbering in the thousands and accounting for close to eight percent of the entire city.
That figure understates the cultural footprint. Greater Los Angeles holds the largest Taiwanese American population in the United States, and the eastern San Gabriel Valley, including Diamond Bar, sits at the heart of it. The combined Chinese and Taiwanese concentration of the valley is the densest such community in the country.
What the families wanted
Ask why Diamond Bar specifically, and the answer almost always circles back to school catchments. Southern Diamond Bar belongs to the Walnut Valley Unified School District, and its flagship, Diamond Bar High School, ranks among the strongest public high schools in California. Its student body is roughly 72 percent Asian.
For a Taiwanese family weighing where to buy, that one fact could settle the decision. A house on the south side of the city meant a path to a top-ranked high school without the cost of private tuition, in a neighbourhood where your children would not be the only ones carrying a violin case and a tutoring schedule.
The Landmarks
H Mart Diamond Bar, 2825 S Diamond Bar Blvd. The anchor of Taiwanese and Korean daily life on the south side. Its food court is the unofficial town square, a place to settle in with a bowl of noodles after the weekend grocery run, and the surrounding plaza has become a magnet for the city’s Asian-owned shops and restaurants.
Cafe 101, 2763 S Diamond Bar Blvd. A Taiwanese kitchen tucked into the H Mart plaza, serving the home-style dishes that taste like a night market rather than a banquet hall. It is the kind of unfussy place that tells you a community has truly put down roots, where the menu is written for the people who grew up eating it.
Mimi 5 Bobee, 333 S Diamond Bar Blvd. A Taiwanese restaurant whose beef noodle soup won “Best Noodle” at the Taiwanese Culture Festival in Los Angeles in December 2012. From this Diamond Bar address it expanded across the valley to Rowland Heights and Rancho Cucamonga, a small empire built on popcorn chicken and bubble tea.
Pop Pot, Diamond Bar. A Taiwanese hot pot, bubble tea, and street-snack spot that captures the younger, casual side of the community, the after-school and after-work crowd of a city where boba is a first language.
Covenant Taiwanese Presbyterian Church, Diamond Bar. A Taiwanese-language congregation serving local families, one strand of the dense network of Taiwanese churches that ties the eastern valley together. For first-generation immigrants, the Taiwanese church has long doubled as a community hall, a place to worship and to keep the language alive in the next generation.
Evangelical Formosan Church of Rowland Heights, 18555 Fajardo St, Rowland Heights. Just over the city line, this is one of the older anchors of the Evangelical Formosan Church network, which began among Taiwanese immigrants in Southern California. Diamond Bar families have long crossed the short distance to worship and gather here.
Diamond Bar Center, 1600 Grand Ave. The city’s hilltop civic and banquet venue, where Lunar New Year banquets, wedding receptions, and community celebrations fill the calendar. On the right weekend its ballroom is the closest thing Diamond Bar has to a town festival.
Where They Came From
The Taiwanese of Diamond Bar trace back, ultimately, to the island of Taiwan, and within it to the cities that sent the most emigrants to America after 1965: Taipei above all, along with Taichung, Kaohsiung, and the towns of the western plain.
But the more immediate origin, for most Diamond Bar families, is not Taiwan at all. It is the inner San Gabriel Valley. The journey here was usually two steps: from Taiwan to Monterey Park or Hacienda Heights, and then, a decade or a generation later, east to the hills. Diamond Bar is a second-settlement suburb, populated less by new arrivals than by families trading up.
Diamond Bar Today
Diamond Bar today is a comfortable, hillside Asian American suburb that has largely settled into itself. The Taiwanese community here is not loud or theatrical. It expresses itself in the grocery cart at H Mart, in the Saturday Chinese-school run, in the steady churn of college acceptance letters each spring.
It also shares the city, and this is worth saying plainly. Taiwanese families live alongside a larger mainland Chinese population, a substantial Korean community, and Filipino, Vietnamese, and Indian neighbours. Diamond Bar is not a single-ethnicity enclave the way 1980s Monterey Park briefly was. It is a layered Asian American suburb where the Taiwanese are one distinct thread, recognisable to those who know to look for it, in the Taiwanese restaurants, the Presbyterian congregations, and the particular accent of the food.
The chief shared frustration is the freeway. Diamond Bar sits at the notorious SR-57/SR-60 confluence, one of the most congested interchanges in the nation, and the long-running effort to fix it shapes daily life as surely as any cultural institution. For a community that prizes its short hop to the noodle shops and grocers of the valley, the traffic is the price of the address.
Frequently Asked Questions
How many Taiwanese people live in Diamond Bar?
Taiwanese-born residents number in the low thousands and account for roughly eight percent of Diamond Bar’s population, with thousands more of Taiwanese descent. The Taiwanese in Diamond Bar form one of the larger such communities in the eastern San Gabriel Valley, which itself holds the densest Taiwanese and Chinese American concentration in the country.
Why did Taiwanese families move to Diamond Bar?
Most came east from earlier valley enclaves like Monterey Park and Hacienda Heights, drawn by larger hillside homes and the top-ranked schools of the Walnut Valley Unified School District. Diamond Bar offered an upgrade for established families rather than a first landing for new arrivals.
Is Diamond Bar a Taiwanese or Chinese city?
Both, and more. Diamond Bar is around six in ten Asian, with mainland China and Taiwan as the two largest immigrant origins, plus sizeable Korean, Filipino, and Vietnamese communities. The Taiwanese in Diamond Bar are a distinct thread within a broader, layered Asian American suburb rather than the sole story.
Where do you find Taiwanese food in Diamond Bar?
Start with the H Mart plaza on South Diamond Bar Boulevard, home to the Taiwanese kitchen Cafe 101, and Mimi 5 Bobee on the same street, whose beef noodle soup won a Los Angeles Taiwanese Culture Festival award. Pop Pot adds hot pot and bubble tea, and Rowland Heights is minutes away for more.
What schools serve the Taiwanese community in Diamond Bar?
Southern Diamond Bar falls in the Walnut Valley Unified School District, whose Diamond Bar High School ranks among California’s strongest public high schools and is roughly 72 percent Asian. The district’s reputation is one of the main reasons Taiwanese families chose the city.
How is Diamond Bar different from Arcadia or Rowland Heights?
Arcadia and San Marino drew an earlier, wealthier wave of Taiwanese settlement closer to the valley core, while Rowland Heights remains the eastern valley’s dense Chinese and Taiwanese commercial centre. Diamond Bar is more residential and hillside, a quieter bedroom suburb that relies on its neighbours for the busiest retail and restaurant strips.
If your family’s story passed through Diamond Bar, or any of the places Taiwanese people have made home in America, Atlas of Home can trace that journey. From a street in Taipei to a noodle shop in Monterey Park, to a hillside cul-de-sac above the 57 and 60, to wherever you are now.