Results breakdown of the 1991 Spanish local elections (Castile and León)

This is the results breakdown of the local elections held in Castile and León on 26 May 1991. 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.

Ávila

 * Population: 46,992

Burgos

 * Population: 163,507

León

 * Population: 137,758

Palencia

 * Population: 77,464

Ponferrada

 * Population: 60,401

Salamanca

 * Population: 162,037

Segovia

 * Population: 55,188

Soria

 * Population: 32,609

Valladolid

 * Population: 333,680

Zamora

 * Population: 63,436