Building Censuses 
Population figures
Municipalities which have depopulated the most since 1981 by Municipality and  census population.
Units: ?

,Census population of 2001,Census population of 1981,
Barcelona,1,503,884,1,752,627,
Madrid,2,938,723,3,158,818,
Hospitalet de Llobregat (L'),239,019,295,074,
Santa Coloma de Gramenet,112,992,140,613,
Badalona,205,836,229,780,
Cádiz,133,363,156,711,
Cornellà de Llobregat,79,979,91,563,
Mieres,47,719,58,718,
Langreo,45,731,56,347,
Ferrol,77,950,87,691,
Eibar,28,219,36,919,
Sestao,31,773,40,374,
Errenteria,38,224,46,496,
Alcoy/Alcoi,58,358,66,396,
Tineo,12,598,20,076,
Basauri,45,085,52,554,
Portugalete,51,066,58,071,
Santurtzi,47,173,53,919,
Valencia,738,441,744,748,
Granada,240,661,246,642,
San Martín del Rey Aurelio,20,247,25,761,
Aller,14,639,20,005,
Valdés,14,789,20,132,
Palmas de Gran Canaria (Las),354,863,360,098,
Estrada (A),22,308,27,322,
Avilés,83,185,87,996,
Pasaia,15,962,20,756,
Sant Adrià de Besòs,31,939,36,397,
Fonsagrada (A),5,082,9,392,
Valladolid,316,580,320,293,
Coín,17,388,20,958,
Baña (A),4,800,8,361,
Cangas del Narcea,16,511,20,037,
Castrelo de Miño,2,034,5,508,
Cualedro,2,391,5,642,
Forcarei,4,801,8,024,
Arrasate o Mondragón,23,118,26,279,
Vilardevós,2,803,5,932,
San Juan de Aznalfarache,19,340,22,465,
Ramirás,2,065,5,132,
Manresa,63,981,67,007,
Covelo,3,743,6,766,
Almadén,6,830,9,722,
Riós,2,132,5,008,
Corvera de Asturias,15,885,18,728,
Baltar,1,233,4,018,
Pravia,9,226,11,961,
Pantón,3,341,6,068,
Carcaixent,19,508,22,228,
Pola de Gordón (La),4,719,7,416,
Notes:
1) Not included are municipalities that have gone missing, have been created  or those from which  another municipality has been separated during the period 
 1981-2001.
Source: National Statistics Institute