| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Buaile an Ghleanna | city | Mayo | Ireland | 53.87 | -9.90 | 0 | 317 |
| Buckfield | city | Mayo | Ireland | 53.84 | -9.56 | 32 | 4567 |
| Buckwaria | city | Mayo | Ireland | 53.80 | -9.50 | 288 | 7815 |
| Buirios Umhaill | city | Mayo | Ireland | 53.90 | -9.58 | 3 | 957 |
| Bullaunmeneen | city | Mayo | Ireland | 53.82 | -9.44 | 200 | 2158 |
| Bun Rí | city | Mayo | Ireland | 54.12 | -9.14 | 32 | 11362 |
| Bun an Churraigh | city | Mayo | Ireland | 53.98 | -9.97 | 104 | 1232 |
| Bun an Mhulinn | city | Mayo | Ireland | 54.16 | -9.93 | 36 | 828 |
| Bun na hAbhna | city | Mayo | Ireland | 54.19 | -9.91 | 160 | 935 |
| Bunacurry | city | Mayo | Ireland | 53.98 | -9.97 | 104 | 1232 |
| Bunaheraghtish | city | Mayo | Ireland | 54.13 | -9.23 | 88 | 2037 |
| Bunawillin | city | Mayo | Ireland | 54.16 | -9.93 | 36 | 828 |
| Buncam | city | Mayo | Ireland | 53.81 | -9.28 | 164 | 8109 |
| Bunduvowen | city | Mayo | Ireland | 53.96 | -9.20 | 75 | 1439 |
| Bunmahowen | city | Mayo | Ireland | 54.19 | -9.91 | 160 | 935 |
| Bunnafinglas | city | Mayo | Ireland | 54.03 | -9.13 | 62 | 2267 |
| Bunnahowen | city | Mayo | Ireland | 54.19 | -9.91 | 160 | 935 |
| Bunnyconnellan | city | Mayo | Ireland | 54.11 | -9.03 | 249 | 1322 |
| Bunnyconnellan East | city | Mayo | Ireland | 54.09 | -9.00 | 830 | 986 |
| Bunown | city | Mayo | Ireland | 53.98 | -10.22 | 1131 | 188 |
| Bunrawer | city | Mayo | Ireland | 53.79 | -9.42 | 318 | 1522 |
| Bunree | city | Mayo | Ireland | 54.12 | -9.14 | 32 | 11362 |
| Burnataunia | city | Mayo | Ireland | 53.77 | -9.22 | 154 | 1439 |
| Burren | city | Mayo | Ireland | 53.91 | -9.31 | 311 | 4912 |
| Burren | city | Mayo | Ireland | 53.93 | -9.33 | 367 | 1326 |
| Burris | city | Mayo | Ireland | 53.85 | -9.18 | 193 | 2230 |
| Burrishoole | city | Mayo | Ireland | 53.90 | -9.58 | 3 | 957 |
| Burrishoole Abbey | city | Mayo | Ireland | 53.90 | -9.58 | 3 | 957 |
| Bushfield | city | Mayo | Ireland | 53.83 | -9.03 | 134 | 2560 |