Results breakdown of the 2003 Spanish local elections (Basque Country)

This is the results breakdown of the local elections held in the Basque Country on 25 May 2003. The following tables show detailed results in the autonomous community's most populous municipalities, sorted alphabetically.

City control
The following table lists party control in the most populous municipalities, including provincial capitals (shown in bold). Gains for a party are displayed with the cell's background shaded in that party's colour.

Barakaldo

 * Population: 95,515

Basauri

 * Population: 45,482

Bilbao

 * Population: 353,950

Donostia-San Sebastián

 * Population: 181,700

Errenteria

 * Population: 38,697

Getxo

 * Population: 84,024

Irun

 * Population: 57,618

Portugalete

 * Population: 51,553

Santurtzi

 * Population: 47,460

Vitoria-Gasteiz

 * Population: 221,270