Padmanabhapuram is an historically place in Kanyakumari district with a total population of 21191 (2011 census). The town has witnessed a decline in growth rate during the past two decades. The highest growth rate in population was observed during the decade 1961-1971.
| Year | Census Population | Growth Rate(Decadal-%) |
| 2001 | 20051 | 9.11 |
| 2011 | 21191 | 5.66 |
Density
The town comprised of 21 wards within its administrative boundary. The overall density of the town is 3099 persons/Sq.Km during the year 2001.
POPULATION AS PER CENSUS-2011 FOR EACH WARD
| Wards | Total Population |
Male | Female |
| 1 | 1168 | 582 | 586 |
| 2 | 647 | 326 | 321 |
| 3 | 710 | 355 | 355 |
| 4 | 841 | 437 | 404 |
| 5 | 1116 | 542 | 574 |
| 6 | 973 | 473 | 500 |
| 7 | 888 | 429 | 459 |
| 8 | 930 | 433 | 497 |
| 9 | 1290 | 632 | 658 |
| 10 | 1555 | 776 | 779 |
| 11 | 1262 | 623 | 639 |
| 12 | 1324 | 666 | 658 |
| 13 | 1245 | 595 | 650 |
| 14 | 895 | 454 | 441 |
| 15 | 1028 | 508 | 520 |
| 16 | 1395 | 686 | 709 |
| 17 | 1036 | 514 | 522 |
| 18 | 935 | 465 | 470 |
| 19 | 852 | 418 | 434 |
| 20 | 412 | 139 | 273 |
| 21 | 689 | 335 | 354 |
| Total | 21191 | 10388 | 10803 |