1999–2000 Segunda División
The 1999–2000 Segunda División season saw 22 teams participate in the second flight Spanish league. The teams that promoted to La Liga were UD Las Palmas, Osasuna and Villarreal CF. The teams that relegated to Segunda División B were CP Mérida, Atlético de Madrid B, CD Logroñés and CD Toledo.
Teams
| Team | Home city | Stadium | Capacity |
| Albacete | Albacete | Carlos Belmonte | 18,000 |
| Atlético Madrid B | Madrid | Cerro del Espino | 3,900 |
| Badajoz | Badajoz | Nuevo Vivero | 15,198 |
| Compostela | Santiago de Compostela | San Lázaro | 12,000 |
| Córdoba | Córdoba | Nuevo Arcángel | 21,822 |
| Eibar | Eibar | Ipurua | 5,000 |
| Elche | Elche | Martínez Valero | 36,017 |
| Extremadura | Almendralejo | Francisco de la Hera | 11,580 |
| Getafe | Getafe | Coliseum Alfonso Pérez | 17,393 |
| Las Palmas | Las Palmas | Insular | 22,000 |
| Leganés | Leganés | Butarque | 8,138 |
| Levante | Valencia | Ciutat de València | 26,354 |
| Lleida | Lleida | Camp d'Esports | 13,500 |
| Logroñés | Logroño | Las Gaunas | 14,895 |
| Mérida | Mérida | Romano | 14,600 |
| Osasuna | Pamplona | El Sadar | 19,800 |
| Recreativo de Huelva | Huelva | Nuevo Colombino | 21,670 |
| Salamanca | Villares de la Reina | Helmántico | 17,341 |
| Sporting de Gijón | Gijón | El Molinón | 25,885 |
| Tenerife | Santa Cruz de Tenerife | Heliodoro Rodríguez López | 20,000 |
| Toledo | Toledo | Salto del Caballo | 5,300 |
| Villarreal | Villarreal | El Madrigal | 22,000 |
Teams by Autonomous Community
| Autonomous community | Number of teams | Teams | |
| 1 | 3 | Badajoz, Extremadura, Mérida | |
| 1 | 3 | Atlético Madrid B, Leganés, Getafe | |
| 1 | 3 | Elche, Levante, Villarreal | |
| 4 | 2 | Córdoba, Recreativo | |
| 4 | 2 | Las Palmas, Tenerife | |
| 4 | 2 | Albacete, Toledo | |
| 7 | 1 | Sporting | |
| 7 | 1 | Eibar | |
| 7 | 1 | Salamanca | |
| 7 | 1 | Lleida | |
| 7 | 1 | Compostela | |
| 7 | La Rioja | 1 | Logroñés |
| 7 | 1 | Osasuna |