Dublin

1 city in western California east-southeast of Oakland population 46,036

2 city in central Ohio, a suburb of Columbus population 41,751

3 county of eastern Ireland bordering the Irish Sea in Leinster area 356 square miles (926 square kilometers), population 1,273,069

4 city and port at the mouth of the Liffey River on Dublin Bay (an inlet of the Irish Sea) population 527,612 ◆The city of Dublin is the capital of Ireland and of the county of Dublin.