| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Bracklagh | city | Mayo | Ireland | 53.96 | -9.41 | 78 | 440 |
| Bracklagh | city | Mayo | Ireland | 53.95 | -8.79 | 830 | 1788 |
| Brackloon | city | Mayo | Ireland | 53.76 | -9.56 | 278 | 4523 |
| Brackloonagh North | city | Mayo | Ireland | 53.99 | -8.70 | 269 | 1507 |
| Brackloonagh South | city | Mayo | Ireland | 53.97 | -8.75 | 347 | 1562 |
| Brackwanshagh | city | Mayo | Ireland | 54.03 | -9.23 | 78 | 1242 |
| Breac-chluanach Theas | city | Mayo | Ireland | 53.97 | -8.75 | 347 | 1562 |
| Breacbháinseach | city | Mayo | Ireland | 54.03 | -9.23 | 78 | 1242 |
| Breaghwy | city | Mayo | Ireland | 53.85 | -9.24 | 137 | 6550 |
| Breaghwy | city | Mayo | Ireland | 54.08 | -9.09 | 157 | 3611 |
| Brees | city | Mayo | Ireland | 53.78 | -9.07 | 413 | 1551 |
| Brickeens | city | Mayo | Ireland | 53.72 | -8.88 | 249 | 1290 |
| Briska | city | Mayo | Ireland | 54.13 | -9.71 | 830 | 265 |
| Brockagh | city | Mayo | Ireland | 53.86 | -9.49 | 190 | 2119 |
| Brownhall | city | Mayo | Ireland | 53.79 | -9.15 | 252 | 1789 |
| Brownhall Demesne | city | Mayo | Ireland | 53.79 | -9.15 | 252 | 1789 |
| Bréachmhaigh | city | Mayo | Ireland | 53.85 | -9.24 | 137 | 6550 |