Irish Sea Cities and Towns Cities and Towns

| Rank_ | City_Town | County | Region_Province | Population | Country |
|---|---|---|---|---|---|
| 1 | Dublin | County Dublin | Leinster | 505739 | Republic of Ireland |
| 2 | Liverpool | Merseyside | North West | 447500 | England |
| 3 | Belfast | County Antrim | Ulster | 276459 | Northern Ireland |
| 5 | Blackpool | Lancashire | North West | 142900 | England |
| 6 | Southport | Merseyside | North West | 99456 | England |
| 7 | Birkenhead | Merseyside | North West | 83729 | England |
| 8 | Bangor | County Down | Ulster | 76851 | Northern Ireland |
| 9 | Barrow-in-Furness | Cumbria | North West | 71980 | England |
| 10 | Wallasey | Merseyside | North West | 58710 | England |
| 11 | Crosby | Merseyside | North West | 51789 | England |
| 12 | Morecambe | Lancashire | North West | 45000 | England |
| 13 | Lytham St Annes | Lancashire | North West | 41330 | England |
| 14 | Drogheda | County Louth | Leinster | 35190 | Republic of Ireland |