| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Trebol | city | Ancash | Peru | -8.77 | -78.24 | 8389 | 14983 |
| Trebol | city | Arequipa | Peru | -15.30 | -73.10 | 9228 | 330 |
| Trebol Pampa | city | Ancash | Peru | -9.24 | -76.93 | 8389 | 5571 |
| Treinta De Agosto | city | Loreto | Peru | -2.16 | -74.64 | 830 | 149 |
| Tres Agua | city | Cajamarca | Peru | -5.89 | -78.92 | 3362 | 6353 |
| Tres Bocanas | city | Tumbes | Peru | -3.76 | -80.60 | 846 | 1749 |
| Tres Cabezas | city | Ancash | Peru | -9.07 | -78.54 | 265 | 290 |
| Tres Compuertas | city | La Libertad | Peru | -7.84 | -79.19 | 88 | 10751 |
| Tres Compuertas | city | Lambayeque | Peru | -6.94 | -79.55 | 406 | 28246 |
| Tres Compuertas | city | Piura | Peru | -4.87 | -80.62 | 265 | 22856 |
| Tres Cruce | city | Arequipa | Peru | -15.73 | -73.34 | 8389 | 1005 |
| Tres Cruces | city | Cusco | Peru | -13.12 | -71.58 | 10406 | 165 |
| Tres Cruces | city | Ancash | Peru | -10.57 | -77.43 | 4189 | 308 |
| Tres Cruces | city | Ancash | Peru | -9.99 | -77.87 | 2611 | 184 |
| Tres Cruces | city | Arequipa | Peru | -15.73 | -73.34 | 8389 | 1005 |
| Tres Cruces | city | Huanuco | Peru | -10.25 | -76.30 | 10068 | 4586 |
| Tres Cruces | city | Tacna | Peru | -17.85 | -70.05 | 6709 | 154 |
| Tres Esquinas | city | Ica | Peru | -14.02 | -75.75 | 1669 | 68649 |
| Tres Esquinas | city | Ayacucho | Peru | -12.90 | -74.26 | 9228 | 16897 |
| Tres Estancias | city | Arequipa | Peru | -15.45 | -71.52 | 14524 | 343 |
| Tres Hermanas | city | Loreto | Peru | -3.74 | -73.03 | 341 | 596 |
| Tres Huacas | city | Cajamarca | Peru | -6.43 | -79.38 | 5029 | 842 |
| Tres Huacas | city | La Libertad | Peru | -7.69 | -79.26 | 830 | 14170 |
| Tres Islas | city | Ucayali | Peru | -8.53 | -74.28 | 830 | 256 |
| Tres Marias | city | Amazonas | Peru | -5.76 | -78.59 | 3349 | 4356 |
| Tres Montones | city | Ayacucho | Peru | -13.70 | -73.83 | 12887 | 1675 |
| Tres Montones | city | Lima | Peru | -11.06 | -77.14 | 4189 | 2072 |
| Tres Ojos | city | Moquegua | Peru | -16.94 | -70.54 | 15164 | 458 |
| Tres Orcones | city | Piura | Peru | -5.85 | -79.62 | 2004 | 1750 |
| Tres Palos | city | Arequipa | Peru | -15.51 | -74.63 | 830 | 270 |
| Tres Palos | city | La Libertad | Peru | -7.96 | -79.20 | 154 | 15901 |
| Tres Panes | city | La Libertad | Peru | -7.54 | -79.51 | 52 | 1788 |
| Tres Piedras | city | La Libertad | Peru | -7.64 | -78.41 | 12588 | 5183 |
| Tres Piedras | city | Ancash | Peru | -10.04 | -78.16 | 830 | 12704 |
| Tres Piedras | city | Tacna | Peru | -17.59 | -70.74 | 2509 | 1677 |
| Tres Puentes | city | Lambayeque | Peru | -6.46 | -79.65 | 830 | 3278 |
| Tres Puertas | city | Junin | Peru | -11.32 | -76.20 | 13815 | 1 |
| Tres Quebradas | city | Lima | Peru | -12.18 | -76.47 | 11171 | 570 |
| Tres Quebradas | city | Moquegua | Peru | -17.29 | -70.99 | 4189 | 0 |
| Tres Rios | city | La Libertad | Peru | -7.95 | -78.10 | 12142 | 7583 |
| Tres Rios | city | La Libertad | Peru | -7.91 | -78.45 | 11748 | 6067 |
| Tres Tomas | city | Lambayeque | Peru | -6.64 | -79.73 | 830 | 15875 |
| Tres Unidos | city | Ucayali | Peru | -9.68 | -74.27 | 830 | 149 |
| Tres Unidos | city | San Martin | Peru | -6.81 | -76.23 | 987 | 2746 |
| Tres Unidos | city | San Martin | Peru | -6.50 | -76.46 | 987 | 22429 |
| Tres Unidos | city | Lima | Peru | -11.73 | -76.98 | 2509 | 756 |
| Tres Unidos de Metereni | city | Junin | Peru | -11.80 | -74.22 | 3349 | 596 |
| Tres de Mayo | city | San Martin | Peru | -5.75 | -77.48 | 3507 | 1278 |
| Tres de Mayo | city | Huanuco | Peru | -8.52 | -76.34 | 1978 | 597 |
| Tres de Mayo | city | Lima | Peru | -11.96 | -77.09 | 255 | 976756 |
| Tres de Octubre | city | Ancash | Peru | -9.11 | -78.56 | 3 | 105 |
| Tres de Octubre | city | San Martin | Peru | -6.54 | -76.34 | 1046 | 59328 |
| Tres de Octubre | city | Lima | Peru | -11.01 | -77.62 | 187 | 18888 |
| Tres de Octubre | city | Huanuco | Peru | -9.16 | -75.89 | 3349 | 2608 |
| Tres y Medio | city | Ancash | Peru | -9.05 | -78.57 | 98 | 7498 |
| Tresunidos | city | Loreto | Peru | -4.14 | -70.32 | 288 | 0 |