La Cité-Limoilou serves as the central borough of Quebec City in Canada, situated at coordinates 46.8219 north latitude and 71.2372 west longitude. As an administrative division, it is a relatively new entity that was established on November 1, 2009. This formation resulted from the amalgamation of two former boroughs, La Cité and Limoilou, creating a unified municipal district within the larger city structure.

The area possesses deep historical roots, with its name originating from the 16th-century French explorer Jacques Cartier's manor in Saint-Malo. The first recorded instance of the name Limoilou appeared in 1893, though the territory remained entirely rural until the end of the 19th century. Early settlements like Stadacona and Hedleyville emerged along the Saint-Charles River before the area was incorporated into Quebec City in 1909.

The borough comprises nine distinct districts, with six originating from La Cité and three from Limoilou. Its historic heart is Vieux-Québec–Cap-Blanc–colline Parlementaire, centered on the old walled city, Parliament Hill, and the Old Port. The former Limoilou area is defined by a grid pattern layout with numerically named streets, featuring neighborhoods such as Vieux-Limoilou, Lairet, and Maizerets.

La Cité-Limoilou is recognized for its significant architectural heritage, being the oldest borough in Quebec City in terms of architecture. It contains many important institutions and historic sites, including the Petit Champlain shopping district. The area's dense urban environment and preserved historic structures provide a unique cultural landscape that distinguishes it from other parts of the city.

The borough is the most populous in Quebec City, comprising 19.73% of the total population. The former Limoilou borough had a recorded population of 44,980 in 2001, with a density of 4,656 inhabitants per square kilometer. It is bordered by Beauport, Charlesbourg, and Les Rivières, maintaining its status as a densely populated urban center within the regional geography.