| name | type | Area (m²) | capital city | Country | continent | population (people) |
|---|---|---|---|---|---|---|
| Acquaviva | Municipality | 4,860,000 | San Marino | Europe | 2,133 | |
| Ad Dawhah | Municipality | 132,000,000 | Qatar | Asia | 796,947 | |
| Aglona Municipality | Municipality | 392,700,000 | Latvia | Europe | 4,561 | |
| Ailinglaplap Atoll | Municipality | 14,700,000 | Marshall Islands | Oceania | 1,959 | |
| Ailuk Atoll | Municipality | 5,400,000 | Marshall Islands | Oceania | 513 |