Every other town in this atlas is a cluster of many makers. Zhengzhou is one factory. The Foxconn megacampus here — a sealed city of dormitories, canteens and clinics — assembles up to half the world's iPhones, with a workforce that swells past 350,000 at the autumn peak.
On the edge of Zhengzhou, capital of Henan, sits a Foxconn campus that works less like a factory than like a walled city — dormitories, canteens, clinics and shops spread over several square kilometres. At the autumn peak it houses something approaching 350,000 workers and can turn out up to half a million iPhones a day, assembling by most counts around half of all the iPhones on Earth. One company's output here is roughly 80% of Zhengzhou's exports and 60% of the entire province's trade. This is not a cluster of small workshops; it is a single corporation the size of a town.
Foxconn — Hon Hai, of Taiwan — is the world's largest electronics contract manufacturer and Apple's chief supplier, and it built its first Chinese empire in Shenzhen from 1988. In 2010, as Shenzhen's costs climbed and the city turned toward design and innovation, Foxconn moved assembly inland. Henan — China's third-most-populous province, and then a relatively poor one — offered tax breaks, cheap land, and, crucially, the muscle to recruit hundreds of thousands of workers. The local governments saw a goose that laid golden eggs, and they were right.
More than nine in ten of the workers are Henan natives, and the average age is around forty — not the "factory girls and boys" of the coastal boom but, as one observer put it, the uncles and aunties. Up to half the peak workforce are temporary "dispatch" hires; more than thirty thousand robots work the lines alongside them. Circuit boards arrive pre-built; the work here is the final, fiddly assembly — aligning camera modules, bonding screens, seating batteries, sealing seams under microscopes — and then relentless testing, with anything past a tiny defect threshold scrapped. Through the autumn the campus runs day and night for each new iPhone launch.
In October 2022, in the middle of peak iPhone-14 season, a Covid outbreak hit. The campus went into "closed-loop" lockdown — workers sealed inside, the infected reportedly housed alongside the healthy, food running short. Late that month, thousands of workers simply left: climbing the fences and walking home, some for days, to counties across Henan, in an exodus people likened to the great famine migration of 1942. Tens of thousands were gone. In November the anger boiled into clashes with riot police over unpaid bonuses and unsafe conditions. Global iPhone output took a real hit — analysts put the shortfall in the millions of units. It was a lesson in what it means to pool half a product's supply in one place.
The recovery was telling. Local governments mounted an almost military recruitment drive — villages reportedly told to send at least one worker each — to refill the lines within weeks. And Apple, rattled, accelerated its hedging: India now assembles a growing share of iPhones, with a target of roughly a quarter of global volume, while Vietnam takes AirPods and laptops. Set beside the other deep dives, Zhengzhou is the atlas's modern company town — not centuries of craft but one megacampus that became the beating heart of the smartphone age, and a standing lesson in how fragile that much concentration can be.