Plural of “headquarters”

The plural of headquarters is headquarters.

Why

"Headquarters" already carries its plural -s built into the word itself, because it began as the literal phrase "head quarters" — the lodgings ("quarters," from Old French "quartier," a district or billeting area) assigned to a commanding officer and staff. Since "quarters" was already a plural noun referring to a set of rooms, the compound inherited that trailing -s permanently, even once it fused into a single word describing one building or one organization.

That history is why "headquarters" doesn't behave like a normal plural today: the -s is fossilized from an older sense of the word and no longer marks number at all. English speakers reanalyzed the whole compound as referring to a single administrative center, so "headquarters" now functions as both the singular and the plural, with the original plural ending frozen in place regardless of how many buildings or offices are actually meant.

Usage note

American usage most often treats "headquarters" as singular when it refers to one organization's main office ("the company's headquarters is downtown"), while British usage leans slightly more toward plural agreement ("headquarters are located in London") — both are defensible, and many careful American writers still use plural agreement when the sentence's logic calls for it, particularly in military and government contexts where "headquarters" can genuinely refer to multiple command posts.

The word's number ambiguity occasionally becomes a genuine point of editorial disagreement: some house style guides insist on treating a single company's "headquarters" as strictly singular no matter what, while others permit either singular or plural verb agreement depending on whether the writer is emphasizing the building itself or the staff and functions housed within it.

Common real mistakes

The error to avoid is inventing a false singular like "headquarter" as a stand-alone noun ("the headquarter is on Main Street") — that form only exists as a verb, in phrases like "the company is headquartered in Chicago," never as the noun naming the building itself. Writers also sometimes strip the -s to make an adjective ("headquarter staff"), which reads as a mistake; the correct adjectival use keeps the full word ("headquarters staff").

The wider pattern

"Headquarters" belongs to a group of English nouns that look plural because they're built from an already-plural component but that function as singular, uncountable, or number-flexible in practice — "crossroads" and "barracks" work the same way, each one fossilizing a plural noun ("roads," the plural of a French-derived word for sleeping quarters) inside a compound that now names a single place or thing. Legal and corporate documents sometimes need to specify a company's "headquarters" precisely for jurisdictional purposes, and careful drafters often add a defining clause ("headquartered at," "with its headquarters located at") specifically because the noun's number is so ambiguous on its own — a single fixed address avoids any dispute over whether "headquarters" should trigger singular or plural agreement elsewhere in a contract.

Examples

• The company's headquarters is located in a converted warehouse downtown.
• Military headquarters were relocated closer to the front lines.
• Employees from three regional offices reported to the new headquarters.
• The organization's headquarters has occupied that building for forty years.
• Troops received new orders directly from headquarters.
• Her headquarters were, for all practical purposes, a corner desk and a laptop.
• The bank moved its headquarters to a smaller building after downsizing.
• Headquarters issued a statement confirming the merger.
• The startup's headquarters is really just a rented office above a bakery.
• Both companies maintained separate headquarters even after the acquisition.
• The nonprofit relocated its headquarters twice within a single decade.
• Regional headquarters report directly to the company's main office overseas.
• A fire forced the temporary evacuation of the agency's headquarters.
• The agency's wartime headquarters was hidden inside an ordinary-looking townhouse.
• New headquarters were built after the old building was condemned.