Siero's 2026 population is now estimated at 53,371. In 1996, the population of Siero was 46,315. Siero has grown by 322 in the last year, which represents a 0.61% annual change. These population values and projections come from INE wstempus municipal register population totals and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Madrid | 3,543,630 | 1.05% |
| Barcelona | 1,748,128 | 0.95% |
| Valencia | 850,475 | 1.15% |
| Zaragoza | 696,009 | 0.42% |
| Sevilla | 689,481 | 0.01% |
| Malaga | 603,540 | 0.75% |
| Murcia | 483,780 | 0.91% |
| Palma | 437,849 | 0.7% |
| Palmas de Gran Canaria, Las | 382,090 | 0.06% |
| Alacant/Alicante | 372,813 | 1.8% |
| Bilbao | 351,462 | 0.1% |
| Cordoba | 323,053 | -0.06% |
| Valladolid | 303,396 | 0.26% |
| Vigo | 294,224 | -0.09% |
| Hospitalet de Llobregat, L' | 294,202 | 1.62% |
| Gijon | 269,623 | -0.1% |
| Vitoria-Gasteiz | 262,164 | 0.56% |
| Coruna, A | 252,521 | 0.39% |
| Elx/Elche | 248,013 | 1% |
| Terrassa | 235,224 | 0.84% |
| Granada | 234,159 | 0.08% |
| Badalona | 233,198 | 0.72% |
| Sabadell | 227,267 | 0.84% |
| Oviedo | 224,889 | 0.41% |
| Cartagena | 221,697 | 0.45% |
| Mostoles | 215,923 | 0.51% |
| Jerez de la Frontera | 213,800 | 0.08% |
| Santa Cruz de Tenerife | 212,618 | 0.31% |
| Pamplona/Iruna | 210,321 | 0.59% |
| Almeria | 206,275 | 0.39% |
| Alcala de Henares | 204,512 | 0.64% |
| Leganes | 197,081 | 0.69% |
| Getafe | 195,108 | 0.97% |
| Donostia/San Sebastian | 190,211 | 0.18% |
| Fuenlabrada | 189,295 | -0.41% |
| Castello de la Plana/Castellon de la Plana | 185,937 | 1.21% |
| Burgos | 177,732 | 0.19% |
| Alcorcon | 176,491 | 0.44% |
| Santander | 175,914 | 0.28% |
| Albacete | 175,700 | 0.17% |
| Marbella | 162,771 | 1.87% |
| San Cristobal de La Laguna | 161,655 | 0.34% |
| Logrono | 152,149 | 0% |
| Badajoz | 150,096 | -0.08% |
| Lleida | 147,605 | 0.92% |
| Salamanca | 146,479 | 0.25% |
| Torrejon de Ardoz | 145,927 | 1.67% |
| Tarragona | 145,317 | 1.16% |
| Dos Hermanas | 144,034 | 1.06% |
| Huelva | 143,210 | 0% |
| Parla | 138,403 | 0.68% |
| Mataro | 132,234 | 0.42% |
| Algeciras | 127,312 | 0.57% |
| Santa Coloma de Gramenet | 124,721 | 0.6% |
| Alcobendas | 124,562 | 0.99% |
| Leon | 123,389 | -0.05% |
| Roquetas de Mar | 114,297 | 2.75% |
| Reus | 112,795 | 1.07% |
| Jaen | 112,179 | -0.05% |
| Girona | 109,954 | 1.19% |
| Cadiz | 108,876 | -0.98% |
| Rivas-Vaciamadrid | 105,963 | 2.73% |
| Ourense | 105,827 | 0.05% |
| Telde | 104,375 | 0.2% |
| Barakaldo | 103,316 | 0.32% |
| Torrevieja | 102,056 | 3.58% |
| Santiago de Compostela | 101,581 | 0.61% |
| Lugo | 100,570 | 0.43% |
| Rozas de Madrid, Las | 99,861 | 0.83% |
| Lorca | 99,694 | 0.73% |
| Sant Cugat del Valles | 99,179 | 1.22% |
| San Sebastian de los Reyes | 98,258 | 1.31% |
| Mijas | 97,250 | 2.26% |
| Caceres | 96,818 | 0.17% |
| Guadalajara | 94,019 | 1.28% |
| Ejido, El | 93,228 | 1.96% |
| San Fernando | 92,994 | -0.37% |
| Cornella de Llobregat | 92,809 | 0.62% |
| Torrent | 92,525 | 1.76% |
| Chiclana de la Frontera | 92,059 | 1.32% |
| Pozuelo de Alarcon | 90,376 | 0.68% |
| Puerto de Santa Maria, El | 90,256 | 0.3% |
| Arona | 88,968 | 1.34% |
| Valdemoro | 87,916 | 2.26% |
| Toledo | 87,541 | 0.37% |
| Velez-Malaga | 86,897 | 0.99% |
| Melilla | 86,708 | -0.08% |
| Orihuela | 85,944 | 1.64% |
| Fuengirola | 85,910 | 0.82% |
| Sant Boi de Llobregat | 85,880 | 0.32% |
| Gandia | 84,691 | 1.87% |
| Talavera de la Reina | 83,956 | 0.18% |
| Rubi | 83,744 | 1.11% |
| Ceuta | 83,482 | -0.14% |
| Pontevedra | 83,312 | 0% |
| Estepona | 81,741 | 2.66% |
| Manresa | 81,591 | 0.76% |
| Benalmadena | 80,522 | 2.79% |
| Coslada | 80,331 | -0.22% |
| Molina de Segura | 79,656 | 1.53% |
| Santa Lucia de Tirajana | 79,522 | 1.19% |
| Benidorm | 78,965 | 2.12% |
| Alcala de Guadaira | 77,894 | 0.54% |
| Palencia | 77,340 | -0.16% |
| Paterna | 77,120 | 1.45% |
| Ciudad Real | 76,402 | 0.24% |
| Getxo | 75,363 | -0.51% |
| Aviles | 75,059 | -0.61% |
| Sagunt/Sagunto | 74,370 | 1.83% |
| Majadahonda | 73,963 | 0.46% |
| Vilanova i la Geltru | 72,505 | 1.21% |
| Arrecife | 72,114 | 1.84% |
| Torremolinos | 71,946 | 0.87% |
| Castelldefels | 70,666 | 0.87% |
| Sanlucar de Barrameda | 70,162 | 0.21% |
| Boadilla del Monte | 68,550 | 3.32% |
| Collado Villalba | 67,996 | 1.07% |
| Viladecans | 67,697 | 0.16% |
| Prat de Llobregat, El | 66,546 | 0.31% |
| Granollers | 65,955 | 0.94% |
| Linea de la Concepcion, La | 64,709 | 0.33% |
| Ferrol | 64,142 | -0.35% |
| Irun | 64,039 | 0.32% |
| Aranjuez | 63,683 | 1.02% |
| Ponferrada | 62,933 | -0.4% |
| Alcoi/Alcoy | 61,902 | 0.71% |
| Arganda del Rey | 61,299 | 1.46% |
| Sant Vicent del Raspeig/San Vicente del Raspeig | 60,572 | 0.54% |
| Granadilla de Abona | 60,494 | 2.97% |
| Merida | 60,364 | 0.23% |
| Colmenar Viejo | 60,255 | 2.6% |
| Motril | 60,164 | 0.5% |
| Zamora | 59,576 | -0.4% |
| Avila | 59,228 | 0.2% |
| Cerdanyola del Valles | 58,719 | 0.33% |
| Pinto | 57,397 | 1.32% |
| Eivissa | 56,289 | 1.72% |
| Tres Cantos | 55,984 | 2.55% |
| Huesca | 55,809 | 0.64% |
| Elda | 55,711 | 0.89% |
| Linares | 55,266 | -0.66% |
| San Bartolome de Tirajana | 54,540 | 0.46% |
| Calvia | 54,288 | 0.92% |
| Vila-real | 54,102 | 0.89% |
| Cuenca | 53,412 | -0.35% |
| Siero | 53,371 | 0.61% |
| Mollet del Valles | 53,307 | 0.6% |
| Rincon de la Victoria | 53,242 | 1.5% |
| Utrera | 52,711 | 0.59% |
| Segovia | 52,450 | 0.14% |
| Torrelavega | 51,868 | 0.14% |
| Vic | 51,491 | 1.37% |
| Adeje | 50,348 | 0.65% |
