| Election | Apruebo Dignidad AD / FA | Dignidad Ahora DA | New Social Pact NPS / NM | Democratic Convergence CD | Chile Vamos Podemos / Vamos | Party of the People PDG | Christian Social Front FSC |
| | | | | | |
| Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | Votes | % | Seats | Votes | % | Seats |
| 2021 | 18,208 | 15.44% | 1 | 2,549 | 2.16% | 0 | 27,890 | 23.65% | 1 | | | | 40,417 | 34.28% | 2 | 5,419 | 4.60% | 0 | 8,253 | 7.00% | 0 |
| 2017 | 7,441 | 6.17% | 0 | | | | 26,247 | 21.77% | 1 | 30,286 | 25.12% | 1 | 47,876 | 39.70% | 2 | | | | | | |
Results of the 2021 general election held on 21 November 2021:[10][11]
| Party | Pact | Party | Pact |
| Votes per commune | Total votes | % | Seats | Votes | % | Seats |
Cauqu- enes | Chanco | Colbún | Linares | Lon- gaví | Parral | Pellu- hue | Retiro | San Javier | Villa Alegre | Yerbas Buenas |
| National Renewal | RN | | Chile Podemos + | 1,289 | 398 | 572 | 7,668 | 819 | 6,059 | 309 | 3,001 | 1,606 | 591 | 758 | 23,070 | 19.56% | 1 | 40,417 | 34.28% | 2 |
| Independent Democratic Union | UDI | 820 | 272 | 410 | 4,445 | 3,789 | 1,672 | 267 | 489 | 2,357 | 965 | 585 | 16,071 | 13.63% | 1 |
| Evópoli | EVO | 123 | 43 | 36 | 181 | 86 | 149 | 51 | 62 | 253 | 230 | 62 | 1,276 | 1.08% | 0 |
| Socialist Party of Chile | PS | | New Social Pact | 1,408 | 311 | 913 | 3,840 | 1,188 | 2,003 | 225 | 710 | 3,058 | 1,181 | 1,162 | 15,999 | 13.57% | 1 | 27,890 | 23.65% | 1 |
| Christian Democratic Party | PDC | 443 | 155 | 3,641 | 3,155 | 467 | 536 | 154 | 447 | 1,088 | 309 | 1,092 | 11,487 | 9.74% | 0 |
| Radical Party of Chile | PR | 61 | 33 | 17 | 64 | 31 | 41 | 20 | 16 | 59 | 36 | 26 | 404 | 0.34% | 0 |
| Democratic Revolution | RD | | Apruebo Dignidad | 3,531 | 640 | 292 | 2,863 | 498 | 1,073 | 1,260 | 356 | 1,264 | 390 | 332 | 12,499 | 10.60% | 1 | 18,208 | 15.44% | 1 |
| Communist Party of Chile | PC | 263 | 69 | 293 | 2,668 | 406 | 335 | 117 | 158 | 597 | 192 | 187 | 5,285 | 4.48% | 0 |
| Social Green Regionalist Federation | FREVS | 36 | 17 | 21 | 86 | 26 | 59 | 50 | 20 | 65 | 21 | 23 | 424 | 0.36% | 0 |
| Republican Party | REP | | Christian Social Front | 1,026 | 243 | 316 | 2,642 | 448 | 803 | 368 | 323 | 1,227 | 376 | 481 | 8,253 | 7.00% | 0 | 8,253 | 7.00% | 0 |
| United Centre | CU | | United Independents | 3,829 | 199 | 119 | 389 | 218 | 283 | 299 | 116 | 266 | 120 | 79 | 5,917 | 5.02% | 0 | 5,917 | 5.02% | 0 |
| Party of the People | PDG | | | 489 | 126 | 228 | 1,831 | 402 | 519 | 130 | 235 | 980 | 231 | 248 | 5,419 | 4.60% | 0 | 5,419 | 4.60% | 0 |
| Paula Nuche Garrido (Independent) | Ind | | | 205 | 40 | 114 | 2,834 | 333 | 353 | 70 | 147 | 272 | 126 | 361 | 4,855 | 4.12% | 0 | 4,855 | 4.12% | 0 |
| Felipe Gonzalez Lopez (Independent) | Ind | | | 340 | 91 | 122 | 1,257 | 282 | 375 | 78 | 149 | 424 | 183 | 169 | 3,470 | 2.94% | 0 | 3,470 | 2.94% | 0 |
| Humanist Party | PH | | Dignidad Ahora | 125 | 43 | 48 | 226 | 85 | 151 | 32 | 78 | 230 | 212 | 56 | 1,286 | 1.09% | 0 | 2,549 | 2.16% | 0 |
| Equality Party | IGUAL | 74 | 42 | 31 | 109 | 62 | 676 | 27 | 81 | 93 | 36 | 32 | 1,263 | 1.07% | 0 |
| Progressive Party | PRO | | | 123 | 53 | 40 | 192 | 81 | 114 | 50 | 51 | 149 | 41 | 43 | 937 | 0.79% | 0 | 937 | 0.79% | 0 |
| Valid votes | 14,185 | 2,775 | 7,213 | 34,450 | 9,221 | 15,201 | 3,507 | 6,439 | 13,988 | 5,240 | 5,696 | 117,915 | 100.00% | 4 | 117,915 | 100.00% | 4 |
| Blank votes | 1,077 | 601 | 273 | 1,356 | 634 | 1,042 | 418 | 626 | 1,271 | 447 | 453 | 8,198 | 6.23% | | | | |
| Rejected votes – other | 669 | 279 | 233 | 1,310 | 363 | 709 | 199 | 300 | 847 | 279 | 291 | 5,479 | 4.16% | | | | |
| Total polled | 15,931 | 3,655 | 7,719 | 37,116 | 10,218 | 16,952 | 4,124 | 7,365 | 16,106 | 5,966 | 6,440 | 131,592 | 42.78% | | | | |
| Registered electors | 37,684 | 9,369 | 18,716 | 82,252 | 27,055 | 38,210 | 7,912 | 17,799 | 39,506 | 14,020 | 15,095 | 307,618 | | | | | |
| Turnout | 42.28% | 39.01% | 41.24% | 45.12% | 37.77% | 44.37% | 52.12% | 41.38% | 40.77% | 42.55% | 42.66% | 42.78% | | | | | |
The following candidates were elected:[10][11]
Gustavo Benavente (UDI), 8,114 votes; Paula Labra (RN), 13,044 votes; Jaime Naranjo (PS), 15,023 votes; and Consuelo Veloso (RD), 8,903 votes.
Results of the 2017 general election held on 19 November 2017:[12][13]
| Party | Pact | Party | Pact |
| Votes per commune | Total votes | % | Seats | Votes | % | Seats |
Cauqu- enes | Chanco | Colbún | Linares | Lon- gaví | Parral | Pellu- hue | Retiro | San Javier | Villa Alegre | Yerbas Buenas |
| Independent Democratic Union | UDI | | Chile Vamos | 2,939 | 899 | 1,228 | 11,238 | 3,419 | 6,167 | 706 | 2,263 | 2,962 | 1,270 | 1,363 | 34,454 | 28.57% | 2 | 47,876 | 39.70% | 2 |
| National Renewal | RN | 3,435 | 571 | 417 | 2,768 | 530 | 936 | 376 | 1,023 | 2,271 | 633 | 462 | 13,422 | 11.13% | 0 |
| Christian Democratic Party | PDC | | Democratic Convergence | 3,319 | 877 | 3,508 | 9,133 | 1,919 | 2,451 | 823 | 1,194 | 3,898 | 1,555 | 1,609 | 30,286 | 25.12% | 1 | 30,286 | 25.12% | 1 |
| Socialist Party of Chile | PS | | Nueva Mayoría | 826 | 387 | 1,156 | 3,185 | 756 | 1,306 | 125 | 642 | 2,851 | 1,096 | 1,060 | 13,390 | 11.10% | 1 | 26,247 | 21.77% | 1 |
| Party for Democracy | PPD | 915 | 298 | 217 | 829 | 1,069 | 3,291 | 345 | 1,212 | 509 | 184 | 180 | 9,049 | 7.50% | 0 |
| Social Democrat Radical Party | PRSD | 1,275 | 66 | 123 | 1,001 | 184 | 117 | 118 | 32 | 215 | 135 | 542 | 3,808 | 3.16% | 0 |
| Democratic Revolution | RD | | Broad Front | 550 | 113 | 218 | 1,845 | 299 | 431 | 122 | 143 | 559 | 186 | 152 | 4,618 | 3.83% | 0 | 7,441 | 6.17% | 0 |
| Humanist Party | PH | 291 | 71 | 138 | 834 | 192 | 253 | 79 | 118 | 580 | 146 | 121 | 2,823 | 2.34% | 0 |
| Citizens | CIU | | Sumemos | 1,056 | 162 | 283 | 821 | 809 | 296 | 428 | 154 | 421 | 115 | 188 | 4,733 | 3.92% | 0 | 4,733 | 3.92% | 0 |
| Progressive Party | PRO | | All Over Chile | 443 | 195 | 204 | 777 | 353 | 366 | 110 | 202 | 510 | 189 | 195 | 3,544 | 2.94% | 0 | 4,003 | 3.32% | 0 |
| País | PAIS | 79 | 21 | 19 | 100 | 40 | 50 | 10 | 18 | 60 | 30 | 32 | 459 | 0.38% | 0 |
| Valid votes | 15,128 | 3,660 | 7,511 | 32,531 | 9,570 | 15,664 | 3,242 | 7,001 | 14,836 | 5,539 | 5,904 | 120,586 | 100.00% | 4 | 120,586 | 100.00% | 4 |
| Blank votes | 1,277 | 524 | 762 | 1,705 | 865 | 866 | 284 | 642 | 1,421 | 490 | 519 | 9,355 | 6.88% | | | | |
| Rejected votes – other | 812 | 264 | 349 | 1,486 | 498 | 679 | 126 | 322 | 834 | 288 | 313 | 5,971 | 4.39% | | | | |
| Total polled | 17,217 | 4,448 | 8,622 | 35,722 | 10,933 | 17,209 | 3,652 | 7,965 | 17,091 | 6,317 | 6,736 | 135,912 | 46.16% | | | | |
| Registered electors | 37,336 | 9,193 | 17,015 | 80,185 | 25,681 | 37,035 | 6,851 | 16,427 | 37,641 | 13,069 | 13,995 | 294,428 | | | | | |
| Turnout | 46.11% | 48.38% | 50.67% | 44.55% | 42.57% | 46.47% | 53.31% | 48.49% | 45.41% | 48.34% | 48.13% | 46.16% | | | | | |
The following candidates were elected:[12][13]
Manuel Matta (PDC), 12,825 votes; Jaime Naranjo (PS), 13,390 votes; Rolando Rentería (UDI), 16,715 votes; and Ignacio Urrutia (UDI), 17,739 votes.