The name is Tupi and it takes apart cleanly: mo-i for snake, i for river, mirim for small. A small river of snakes — a description rather than a poem, the kind of name given by people who had walked the ground and knew what lived along it. Bandeirantes heading inland from São Paulo in search of precious stones in Minas Gerais and Goiás used this spot as a waystation, and by 29 July 1747 the settlement was substantial enough that the townspeople began digging foundations for a mother church dedicated to São José. The parish became a vila on 22 October 1769, and the Vila de São José de Mogi Mirim was handed a territory of startling size — everything between the Atibaia river and the Rio Grande, out to the boundary with Minas Gerais. Almost every municipality in this part of São Paulo was carved out of it later. Mogi Mirim itself became a city in 1849.

Mogi Mirim Esporte Clube, founded on 1 February 1932, is nicknamed the Sapão — the big toad — for the marshes that once surrounded the settlement and the amphibians that filled them. It is the sort of provincial club that produces players rather than trophies, and its most famous graduate arrived in 1992. Rivaldo had come up through Paulista, the club in the Pernambuco city where he was born, and then Santa Cruz in Recife, a lean, bandy-legged forward whose running style scouts kept holding against him. At Mogi Mirim he made twenty-seven appearances and scored nine goals over two seasons — modest numbers that were enough to get him to Corinthians, then Palmeiras, then Deportivo La Coruña, then Barcelona, then the 2002 World Cup final. He never forgot the step. He returned as the club's president in 2008, and seven years later he was on the pitch again alongside Rivaldinho, who left for Boavista in Portugal shortly after. Ask why a man with a Ballon d'Or would spend his retirement running a second-tier club in the interior, and the answer is in those twenty-seven appearances.

The economy here splits neatly in two. On the agricultural side the land grows tomatoes, cassava, sugarcane and oranges, feeding into the processing industries that ring São Paulo's interior. On the industrial side the dominant chain is auto parts, with beverage, footwear and smaller manufacturers filling in around it. Mars runs its Petcare operation in the city; Alpargatas, the company behind Havaianas, has a presence, as does the shock-absorber maker Monroe. It is a working city rather than a picturesque one — 65 kilometres from Campinas, the regional heavyweight, and 129 kilometres from the state capital, close enough to be inside São Paulo's industrial gravity and far enough to keep its own centre of gravity.

The 2022 census counted 92,558 residents across 498 square kilometres at an elevation of 611 metres. Religious life follows Brazil's national pattern in miniature: the Catholic parishes belong to the Diocese of Amparo and still anchor the calendar, while Pentecostal congregations — the Assemblies of God, the Christian Congregation in Brazil, and a long list of smaller churches — have grown steadily, as they have everywhere in the country. Telephone service arrived through the Companhia Telefônica Brasileira, passed to Telesp in 1973, then to Telefónica in 1998, and now goes by Vivo, a chain of custody that reads like a compressed history of Brazilian privatisation. Two hundred and seventy-five years after the first foundations were dug for the church of São José, the small river of snakes has become an interior city that makes car parts and pet food and, once, a Ballon d'Or winner.