Results breakdown of the 2003 Spanish local elections (Asturias)

This is the results breakdown of the local elections held in Asturias 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.

Avilés

 * Population: 83,511

Gijón

 * Population: 270,211

Langreo

 * Population: 47,796

Mieres

 * Population: 48,418

Oviedo

 * Population: 202,938

San Martín del Rey Aurelio

 * Population: 20,186

Siero

 * Population: 48,569