The inhabitants of the commune are known as Basusartars.

Bassussary is located in the former province of Labourd and within the urban area of Bayonne some 5 km south-east of Biarritz and 4 km south by south-west of Bayonne. Access to the commune is by the D932 road from Anglet in the north which passes through the commune on the eastern side and continues south to Ustaritz. The town is in the west of the commune and can be accessed by the D254 road which branches from the D932 on the northern border of the commune and continues through the town west to join the D810 south-west of Biarritz Airport. The D3 comes from the A63 autoroute Exit  5  (Bayonne-Sud) to the town then south forming the western border of the commune and continuing to Arcangues. South-east of the town is another urban area of Betbeder. Much of the commune is urbanised with some areas of forest and meadows. The eastern part next to the D932 contains an industrial estate.

Two bus services pass through and have stops in the commune operated by Transports 64:

• Service 860 Bayonne to Cambo-les-Bains
• Service 880 Bayonne to Arbonne

The commune lies in the drainage basin of the Adour with the Nive river forming the whole eastern border of the commune as it flows north to join the Adour. The Ruisseau d'Urdains flows from a small lake just south of the commune northwards, forming the north-eastern border of the commune, before joining the Nive in the north-eastern corner. The Ruisseau de Harrieta flows from the south-west of the commune to the north-east joining the Ruisseau d'Urbaine near the D932. The Ruisseau de Pétaboure rises in the north-west of the commune and forms the northern border as it flows east to join the Ruisseau de Harrieta in the commune.

The commune name in Basque is Basusarri. Jean-Baptiste Orpustan proposed a structure of baso meaning "forest" and sarri meaning "dense" or "tight" giving the overall meaning of "dense forest".

The following table details the origins of the commune name and other names in the commune.

Sources:

• Raymond: Topographic Dictionary of the Department of Basses-Pyrenees, 1863, on the page numbers indicated in the table. (in French)
• Orpustan: Jean-Baptiste Orpustan, New Basque Toponymy
• Ldh/EHESS/Cassini: Des villages de Cassini aux communes d'aujourd'hui: Commune data sheet Bassussarry, EHESS (in French).
• Lhande: Pierre Lhande, Basque-French Dictionary, 1926 (in French)
• Register: Church Register of Bayonne

Origins:

• Bayonne: Cartulary of Bayonne or Livre d'Or (Book of Gold)
• Collations: Collations of the Diocese of Bayonne
• Navarre: Titles of the Kingdom of Navarre

Bassussarry appears as Baßußarry on the 1750 Cassini Map and does not appear at all on the 1790 version.

During the Peninsular War on 10 December 1813 Bassussarry was the scene of a battle between General Suchet and the Spanish-English.

Blazon: Party per pale, at 1 Gules 2 wood pigeons Argent in pale; at 2 Vert 3 oak leaves Argent 2 and 1; in chief Sable charged with a fess wavy Argent.

This list is incomplete; you can help by adding missing items. (April 2021)

List of Successive Mayors

Bassussarry is one of nine inter-communal structures:

• the Communauté d'agglomération du Pays Basque;
• the SIVOM of Arbonne-Arcangues-Bassussarry;
• the energy association of Pyrénées-Atlantiques;
• the inter-communal association for the management of the Txakurrak centre;
• the inter-communal association to support Basque culture;
• the joint association for the management of drinking water Ura;
• the joint association for collective and non-collective sanitation Ura
• the joint association of maritime Nive;
• the joint association of the drainage basin of the Nive.

Bassussarry is the seat of the SIVOM Arbonne-Arcangues-Bassussarry

The commune is part of the Bayonne-San Sebastián Eurocity.

In 2017 the commune had 3,126 inhabitants.

Historical population

Year Pop. ±% p.a. 1793 263 —     1800 224 −2.27% 1806 276 +3.54% 1821 342 +1.44% 1831 332 −0.30% 1836 382 +2.85% 1841 424 +2.11% 1846 447 +1.06% 1851 411 −1.67% 1856 456 +2.10% 1861 467 +0.48% 1866 486 +0.80% 1872 398 −3.27% 1876 452 +3.23% 1881 401 −2.37% 1886 366 −1.81% 1891 358 −0.44% 1896 384 +1.41%	Year Pop. ±% p.a. 1901 420 +1.81% 1906 404 −0.77% 1911 386 −0.91% 1921 331 −1.53% 1926 343 +0.71% 1931 342 −0.06% 1936 342 +0.00% 1946 331 −0.33% 1954 349 +0.66% 1962 350 +0.04% 1968 483 +5.51% 1975 715 +5.76% 1982 890 +3.18% 1990 1,056 +2.16% 1999 1,817 +6.22% 2007 2,391 +3.49% 2012 2,490 +0.81% 2017 3,126 +4.65%
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Source: EHESS and INSEE

The commune has a public primary school.

The commune is in the Appellation d'origine contrôlée (AOC) zone of Ossau-iraty

The Parish Church of Saint-Barthélemy (19th century) is registered as an historical monument.

According to the Map of the Seven Basque Provinces by Louis Lucien Bonaparte the Basque spoken in Bassussarry is Northern Upper Navarrese dialect.

• Dominique Joseph Garat, born in 1749 at Bayonne and died in 1833 at Bassussarry, was a lawyer, journalist, and French philosopher. He was elected to the Académie française in 1803.
• Christophe-Louis Légasse, born in 1859 at Bassussarry and died in 1931 at Périgueux, was a French Catholic Prelate, successively Apostolic prefect in Saint Pierre and Miquelon from 1899 to 1915, Bishop of Oran from 1915 to 1920, and Bishop of Périgueux from 1920 to 1931.
• Christophe Hondelatte, journalist born in 1962 at Bayonne, grew up in Bassussarry.

• Communes of the Pyrénées-Atlantiques department

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