The Canadian architect Samuel Maclure is the one famous person from Port Mann

The top name is Samuel Maclure (Canadian architect), going by Wikipedia coverage.

Count on the list: 1, each born in Port Mann according to Wikidata and an English or French Wikipedia article.

Among its famous people, writers and artists: 1 of the 1. 100% of the list, where Canadian towns come to 12%.

What counts is a birth that Wikidata places inside Port Mann’s neighbourhood outline (the census tracts it is drawn from), its hospitals and districts too, and that the person’s English or French Wikipedia article repeats. Adult performers, people known chiefly for crimes and those who only lived here are not on the list. In a city split into neighbourhoods (Toronto, Montréal, Ottawa and the others), someone recorded as born only “in the city” stays on the city’s own page; a neighbourhood lists only births recorded in it.

Wikidata may give their birthplace only as Canada or a province, as a rural area or hamlet without a page here, or as another town; or their article may name a different place, or none. Only people both sources agree on are listed, and a fix on Wikidata or Wikipedia shows up here at the next refresh.