| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| B. Esperanza | city | San Luis | Argentina | -34.76 | -65.25 | 994 | 1104 |
| Bagual | city | San Luis | Argentina | -35.14 | -65.57 | 1112 | 518 |
| Bajada Nueva | city | San Luis | Argentina | -35.24 | -66.45 | 1164 | 4 |
| Bajada Nueva | city | San Luis | Argentina | -35.23 | -66.52 | 1145 | 93 |
| Bajo Hondo | city | San Luis | Argentina | -33.15 | -66.35 | 2509 | 766 |
| Bajo de Cautana | city | San Luis | Argentina | -32.24 | -65.49 | 1669 | 237 |
| Bajo de Velis | city | San Luis | Argentina | -32.33 | -65.40 | 2509 | 176 |
| Bajo del Durazno | city | San Luis | Argentina | -32.58 | -66.42 | 2060 | 0 |
| Bajos Hondos | city | San Luis | Argentina | -33.15 | -66.35 | 2509 | 766 |
| Balcarce | city | San Luis | Argentina | -32.56 | -65.03 | 3349 | 725 |
| Balde | city | San Luis | Argentina | -33.34 | -66.62 | 1669 | 3000 |
| Balde Los Torres | city | San Luis | Argentina | -32.03 | -66.10 | 1669 | 0 |
| Balde Viejo | city | San Luis | Argentina | -32.13 | -66.15 | 1669 | 0 |
| Balde de Azcurra | city | San Luis | Argentina | -32.11 | -66.78 | 1669 | 0 |
| Balde de Escudero | city | San Luis | Argentina | -32.09 | -65.57 | 1669 | 298 |
| Balde de Puertas | city | San Luis | Argentina | -32.43 | -66.22 | 2070 | 0 |
| Balde de Quines | city | San Luis | Argentina | -32.05 | -65.73 | 1669 | 120 |
| Balde de Retamo | city | San Luis | Argentina | -32.13 | -65.92 | 1669 | 0 |
| Balde de Torres | city | San Luis | Argentina | -32.03 | -66.10 | 1669 | 0 |
| Balde de los Torres | city | San Luis | Argentina | -32.03 | -66.10 | 1669 | 0 |
| Baldes de Quines | city | San Luis | Argentina | -32.05 | -65.73 | 1669 | 120 |
| Barranca Colorada | city | San Luis | Argentina | -33.25 | -66.37 | 2509 | 9107 |
| Barreal Colorado | city | San Luis | Argentina | -31.91 | -67.13 | 1981 | 0 |
| Batavia | city | San Luis | Argentina | -34.78 | -65.69 | 1669 | 680 |
| Beazley | city | San Luis | Argentina | -33.76 | -66.64 | 1669 | 2627 |
| Bella Vista | city | San Luis | Argentina | -32.35 | -66.55 | 1669 | 0 |
| Bolsa Ura | city | San Luis | Argentina | -32.42 | -65.18 | 2050 | 434 |
| Botija | city | San Luis | Argentina | -32.25 | -66.58 | 1669 | 0 |
| Buena Esperanza | city | San Luis | Argentina | -34.76 | -65.25 | 994 | 1104 |
| Buena Vista | city | San Luis | Argentina | -32.83 | -65.80 | 4429 | 485 |