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City 31 is the main setting for the story events of XCOM: Chimera Squad.


City 31 is a former ADVENT city center that has been turned into the first beacon of coexistence between humanity and the species that once constituted the forces of the Elders. Humans, hybrids, vipers, mutons, and sectoids call this city home. A short time after the war, City 31 hired on the Shrike resistance cell to act as peacekeepers when it was a purely human population. When their former enemies were allowed sanctuary there, Shrike left the city. Some recent events of City 31 include the Bugtown Massacre, a massive attack by hostile Chryssalids that gave reason for the Reclamation Agency to recruit Axiom into its ranks, and the assassination of Mayor Nightingale, the catalyst for the conflict against such Criminal Factions as Gray Phoenix, Sacred Coil, and The Progeny.

City 31 is the only city that manufactures Androids. As there are no longer any nations or global government, androids exist to perform essential and menial labor. Companies like The Momentum Foundation work on these androids.


City 31 displayed on the Chimera Squad field office map table.

City 31 is broken up into nine different districts including The Stacks, Downtown, Old Town, Angler's Point, Switchyard, The Fringe, Riverside, Renova Heights, and Highland Square.



The Stacks make the building blocks for the new world, whether it's the terrocrete foam essential to rapid construction, the vertical farm enclosures for extraterrestrial crops, or the revolutionary androids made exclusively in City 31.

Locals say that the best jobs are in the Stacks, working in manufacturing that 'makes a difference.'


Filled with empty buildings and gigantic structures, Downtown is City 31's central business district. The skyway/walking paths allow for easy access. Famous structures like Shaper's Lane, Ascension Tower, and the Memorial Museum are present, as well as City Hall.

The Starport is also located Downtown.


Old Town is mostly abandoned, with raw sewage in the streets. City 31's Tourism Council advises avoiding Old Town; services are expected to remain limited or nonexistent until 2044.

ADVENT would regularly make raids into Old Town; sweeping up children for Project MNEMONIC LATHE to produce advanced psionic soldiers.


Due to its geography, Angler's Point was the best part of the city during the ADVENT occupation. When food was short, one could catch dinner from the river. It felt open, even though the city wall was always visible. ADVENT patrols were rare, as it was too centrally located for The Resistance to attack it, as well.

The "Bugtown Massacre" occurred there during the Occupation; an enormous number of chryssalids were unleashed on the district, killing many of the inhabitants.


A major transport hub and train depot. Day and night, ADVENT trains crossed through the Switchyard during the war.


Many citizens were forcibly housed in cramped old world buildings in The Fringe. After the War, its refugees took the homes and residences in the advanced and luxurious Highland Square district. Many ADVENT collaborators and troopers were, in turn, forced to live in The Fringe after peace treaties freed them from detention camps.

Home to an Andromedon Sanctuary made from an old sewage plant, which, as of October 2039, had consistent sounds of weapons fire coming from within on Thursdays.


City 31's "Most Popular District" according to What's Fun, 31? and a former propaganda site. Riverside locals were supportive of ADVENT from early in the occupation.

The district has been recently renovated. Riverboat dinner cruises, historic shops dating back to 2012, and over a dozen nightclubs.


Formerly called "Shankville," Renova Heights was outside the ADVENT security wall. After the war, the City Council leveled the place and built something new. In just two years, Renova was completely renovated. Integrated vertical farms, essential services, and autonomously powered. It's the "crown jewel" of City 31.

It's expensive to live there.


Before the Occupation, The Square was full of shops "selling the kinds of things that don't matter anymore". It was converted to housing during the Occupation.

ADVENT collaborators and troopers lived in Highland Square, and after the War ended, many of the homes were vacated, their residents forced back into The Fringe.

After the War, it was given a modern spin on the old idea, and is now filled with shops of Old World memorabilia, sectoid kibble, and various clothing lines. Most of the goods are all locally made.

The Square has access to both local and regional travel, home to high-speed rail and transport options.