Philadelphia, The sixth most populous city in the United States and the center of the Philadelphia metropolitan area. It is located on the Delaware River, in eastern Pennsylvania. Philadelphia is a major center for finance, commerce, and education.. Philadelphia has a population of 1,578,487.
There are 8 countries in Europe with a population smaller than Philadelphia.
| # | Country | Capital City | Population |
| 1 | Vatican | Vatican City | 0 |
| 2 | Monaco | Monaco | 0 |
| 3 | Gibraltar | Gibraltar | 0 |
| 4 | San Marino | San Marino | 0 |
| 5 | Guernsey | St Peter Port | 0 |
| 6 | Jersey | Saint Helier | 0 |
| 7 | Liechtenstein | Vaduz | 0 |
| 8 | Malta | Valletta | 0 |
There are 4 countries in Asia with a population smaller than Philadelphia.
| # | Country | Capital City | Population |
| 1 | Cocos Islands | West Island | 0 |
| 2 | British Indian Ocean Territory | Diego Garcia | 0 |
| 3 | Macao | Macao | 0 |
| 4 | Maldives | Male | 0 |
There are 0 countries in South America with a population smaller than Philadelphia.
| # | Country | Capital City | Population |
There are 12 countries in Ocenia with a population smaller than Philadelphia.
| # | Country | Capital City | Population |
| 1 | United States Minor Outlying Islands | 0 | |
| 2 | Tokelau | 0 | |
| 3 | Nauru | Yaren | 0 |
| 4 | Tuvalu | Funafuti | 0 |
| 5 | Norfolk Island | Kingston | 0 |
| 6 | Pitcairn | Adamstown | 0 |
| 7 | Christmas Island | Flying Fish Cove | 0 |
| 8 | Marshall Islands | Majuro | 0 |
| 9 | American Samoa | Pago Pago | 0 |
| 10 | Cook Islands | Avarua | 0 |
| 11 | Niue | Alofi | 0 |
| 12 | Wallis and Futuna | Mata Utu | 0 |