Same thing, eight ways to say it

How to say “an apartment” in Spanish — country by country

The dictionary word is apartamento — DLE headword; understood everywhere, but the everyday word splits three ways: piso (Spain), departamento (Mexico, Peru, Chile, Argentina), apartamento (Colombia, Caribbean, Uruguay). DAMER has no apartamento entry and its departamento entry only carries territorial-division senses, so those two are not cited for the housing sense. Here is what you'll actually hear in eight cities, with the source for every cell.

What people actually say

WhereThey sayAlso · notes
Argentina Buenos AiresdepartamentoAlso: depto (abbrev., unsourced)
apartamento is not said.
Chile SantiagodepartamentoAlso: depa (colloquial; only seen in a search snippet attributed to DUECh, not verified)
Colombia MedellínapartamentoAlso: apto. (written abbrev.)
departamento is understood; Bogotá is the same (Saúl Ortega, Bogotá, uses apartamento).
Dominican Republic Santo Domingonot sourced yetNo lexicographic entry or Dominican native testimony found. Only indirect evidence: a real Santo Domingo address posted on WordReference reads «Calle Arena, Apartamento 102, Edificio C-IV... Santo Domingo, Distrito Nacional» (official register, not testimony). From Santo Domingo? Tell us what you say.
Spain MadridpisoAlso: apartamento (= small flat, studio)
departamento is not used for housing.
Mexico Mexico CitydepartamentoAlso: apartamento (heard); depa (colloquial, unsourced)
piso is NOT used for the dwelling.
Peru LimadepartamentoAlso: depa (colloquial, unsourced)
Puerto Rico San Juanapartamento

Grey = the pan-Hispanic dictionary word is what people really say there. Blank = we couldn't source it yet.

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Sources

Every cell above is backed by human-authored lexicography or a native speaker who says where they're from — ASALE's Diccionario de americanismos, El Colegio de México's Diccionario del español de México, the Tesoro lexicográfico del español de Puerto Rico, the Peruvian Academy's DiPerú, and country-stated posts on language forums. Nothing here comes from a model's recall. Spot a mistake? Tell us — corrections from native speakers go straight in.

Argentina — departamento
WordReference · joseluisblanco (Argentina): En Argentina se utiliza departamento
WordReference · Ushuaia (castellano rioplatense): en castellano rioplatense, francamente, no decimos apartamento. Sí tenemos departamentos
WordReference · Moritzchen: En Argentina, departamento. En Uruguay, apartamento
Chile — departamento
WordReference · gvergara (Chile), quoted by Lurrezko: en Chile tampoco decimos apartamento, sino departamento
WordReference · fsabroso (Perú): En Perú y Chile es 'departamento'
Colombia — apartamento
WordReference · boyaco (Colombia): en colombia predomina apartamento, pero seguro que todos han oido departamento tambien
WordReference · oa2169 (Colombia): Apartamento decimos en Colombia
WordReference · Saúl Ortega (Bogotá): En la mayoría de edificios residenciales de Bogotá hay más de un apartamento por piso
Dominican Republic —
WordReference · posted Santo Domingo address (not testimony): Calle Arena, Apartamento 102, Edificio C-IV... Santo Domingo, Distrito Nacional
Spain — piso
WordReference · Holes (Spain): En España vivimos en 'pisos', casi nunca decimos 'apartamento' o 'departamento'
WordReference · Argi (Spain): en España usamos 'piso', pero cuando este es de dimensiones reducidas también... 'apartamento'
WordReference · Manuel Herman (Spain): el 'piso' (vivienda en un bloque de edificios)
Mexico — departamento
DEM (COLMEX): Cada una de las secciones de un edificio destinadas para vivienda: departamento amueblado, departamento de soltero
WordReference · oso (Mexico): En México decimos 'departamento'
WordReference · Bilma (Mexico): In Mexico we also use departamento and apartamento. We do not use piso
Peru — departamento
WordReference · fsabroso (Perú): En Perú y Chile es 'departamento'; Coincido con fsabroso (ERASMO_GALENO, Perú)
Castellano Actual (Univ. de Piura): en gran parte de América se prefiere el término departamento
Puerto Rico — apartamento
Tesoro PR: Piso. Vivienda unifamiliar que, junto a otras similares, se encuentra en un edificio... Anglicismo adaptado, usual.
Where we're less sure
  • DO: UNVERIFIED — no source at all beyond a Santo Domingo street address using «Apartamento». Needs a Dominican.
  • CL: one Chilean poster (gvergara) plus a Peruvian poster's claim; DUECh not consulted directly. Have a santiaguino confirm departamento and whether depa is everyday.
  • MX: CDMX vs rest — Janis Joplin (northern Mexico) also says «Por esta parte de México lo común es departamento» (WR 1923049), so no regional split found; still worth a chilango check on how common apartamento is.
  • ES: piso vs apartamento size nuance is native-attested; fine.
  • DLE returned 403 to every fetch; DLE wording (dle.rae.es) is cited via search snippets only.