Basilicas in Chicago, USA and in the world
| Rank | Church Area (Square Meters) | Church Name | Location |
|---|---|---|---|
| 1 | 15,160 | St. Peter's Bascilica | Vatican City |
| 2 | 12,000 | Basilica of the National Shrine of Our Lady of Aparecida | Aparecida, Brazil |
| 3 | 11,700 | Milan Cathedral | Milan, Italy |
| 4 | 11,520 | Seville Cathedral | Seville, Spain |
| 5 | 11,200 | Cathedral of Saint John the Divine | New York, United States |
| 6 | 10,090 | Basilica of Our Lady of Lichen | Konin, Poland |
| 7 | 9,717 | Abbey of Santa Giustina | Padua, Italy |
| 8 | 9,687 | Liverpool Cathedral | Liverpool, United Kingdom |
| 9 | 8,700 | Church of the Holy Trinity | Santarem, Portugal |
| 10 | 8,515 | Basilica of Saint Paul Outside the Walls | Rome, Italy |
| 11 | 8,318 | Basilica-Cathedral of Our Lady of the Pillar | Zaragoza, Spain |
| 12 | 8,318 | Basilica of Our Lady of Pillar | Aragon, Spain |
| 13 | 8,300 | Florence Cathedral | Florence, Italy |
| 14 | 8,260 | Ulm Minster | Ulm, Germany |
| 15 | 8,167 | Basilica of Our Lady of Guadalupe | Mexico City, Mexico |
| 16 | 8,000 | Basilica of the Sacred Heart | Koekelberg, Belgium |
| 17 | 8,000 | Cathedral of Our Lady | Antwerp, Belgium |
| 18 | 8,000 | Rio de Janeiro Cathedral | Rio de Janeiro, Brazil |
| 19 | 7,989 | Basilica of Our Lady of Peace | Yamoussoukro, Ivory Coast |
| 20 | 7,960 | Hagia Sophia | Istanbul, Turkey |
