Population by Grama Niladhari division
| GN Division | Total population |
| Thalwila (511) | 1842 |
| Modarawella (511 A) | 549 |
| Marawila Town (512) | 710 |
| Marawila Wella (512 A) | 880 |
| Marawila South (512 B) | 1370 |
| Marawila North (512 C) | 510 |
| Horogolla South (513) | 1186 |
| Marada North (513 A) | 2160 |
| Marada South (513 B) | 1370 |
| Horogolla North (513 C) | 1244 |
| Ihala Haththiniya (514) | 1587 |
| Pahala Haththiniya (515) | 1491 |
| Meda Haththiniya (515 A) | 1034 |
| Muttibediwila (517) | 561 |
| Sagaragama (517 A) | 860 |
| Ihala Walahapitiya (518) | 1032 |
| Meda Walahapitiya (518 A) | 1172 |
| Egodagoda (518 B) | 680 |
| Pahala Walahapitiya (519) | 535 |
| Puhulhena (519 A) | 984 |
| Medagoda (520) | 720 |
| Yatakalana (520 A) | 874 |
| Hewana (521) | 775 |
| Panangoda (521 A) | 2142 |
| Ihala Kudawewa (522) | 901 |
| Galamuna (522 A) | 890 |
| Pahala Kudawewa (522 B) | 823 |
| Puruduwella (522 C) | 528 |
| Ihala Mahawewa (524) | 2418 |
| Meda Mahawewa (524 A) | 773 |
| Halpanwila East (525) | 1810 |
| Halpanwila West (525 A) | 897 |
| Ihala Koswadiya (526) | 1298 |
| Pahala Koswadiya (527) | 823 |
| Meda Koswadiya (527 A) | 994 |
| Pahala Mahawewa (528) | 626 |
| Weehena (528 A) | 889 |
| Maligawatta (529) | 1025 |
| Adapparagama (529 A) | 741 |
| Mattakotuwa (530) | 1110 |
| Mattakotuwa Wella (530 A) | 2142 |
| Barudelpola (530 B) | 1893 |
| Thoduwawa South (531) | 1770 |
| Thoduwawa North (531 A) | 3737 |
| Meda Thoduwawa (531 B) | 2161 |
| Iranawila West (532) | 4963 |
| Iranawila East (532 A) | 1540 |
Population by Gender
| GN Division | Female | Male | Number of Families | Total Population |
| Thalwila (511) | 956 | 886 | 544 | 1842 |
| Modarawella (511 A) | 283 | 266 | 171 | 549 |
| Marawila Town (512) | 383 | 327 | 217 | 710 |
| Marawila Wella (512 A) | 449 | 431 | 280 | 880 |
| Marawila South (512 B) | 732 | 638 | 422 | 1370 |
| Marawila North (512 C) | 271 | 239 | 157 | 510 |
| Horogolla South (513) | 612 | 574 | 327 | 1186 |
| Marada North (513 A) | 1121 | 1039 | 605 | 2160 |
| Marada South (513 B) | 717 | 664 | 365 | 1370 |
| Horogolla North (513 C) | 656 | 588 | 360 | 1244 |
| Ihala Haththiniya (514) | 816 | 771 | 430 | 1587 |
| Pahala Haththiniya (515) | 777 | 714 | 379 | 1491 |
| Meda Haththiniya (515 A) | 556 | 478 | 282 | 1034 |
| Muttibediwila (517) | 283 | 278 | 163 | 561 |
| Sagaragama (517 A) | 432 | 428 | 256 | 860 |
| Ihala Walahapitiya (518) | 552 | 480 | 303 | 1032 |
| Meda Walahapitiya (518 A) | 602 | 570 | 315 | 1172 |
| Egodagoda (518 B) | 345 | 335 | 217 | 680 |
| Pahala Walahapitiya (519) | 297 | 238 | 164 | 535 |
| Puhulhena (519 A) | 521 | 463 | 255 | 984 |
| Medagoda (520) | 392 | 328 | 213 | 720 |
| Yatakalana (520 A) | 456 | 418 | 272 | 874 |
| Hewana (521) | 429 | 346 | 228 | 775 |
| Panangoda (521 A) | 1121 | 1021 | 587 | 2142 |
| Ihala Kudawewa (522) | 456 | 442 | 256 | 901 |
| Galamuna (522 A) | 450 | 440 | 286 | 890 |
| Pahala Kudawewa (522 B) | 356 | 311 | 174 | 823 |
| Puruduwella (522 C) | 324 | 204 | 142 | 528 |
| Ihala Mahawewa (524) | 1264 | 1154 | 710 | 2418 |
| Meda Mahawewa (524 A) | 412 | 361 | 192 | 773 |
| Halpanwila East (525) | 947 | 863 | 475 | 1810 |
| Halpanwila West (525 A) | 468 | 429 | 243 | 897 |
| Ihala Koswadiya (526) | 673 | 625 | 355 | 1298 |
| Pahala Koswadiya (527) | 425 | 398 | 216 | 823 |
| Meda Koswadiya (527 A) | 485 | 509 | 295 | 994 |
| Pahala Mahawewa (528) | 356 | 270 | 171 | 626 |
| Weehena (528 A) | 453 | 436 | 217 | 889 |
| Maligawatta (529) | 538 | 487 | 292 | 1025 |
| Adapparagama (529 A) | 389 | 352 | 224 | 741 |
| Mattakotuwa (530) | 599 | 511 | 302 | 1110 |
| Mattakotuwa Wella (530 A) | 1093 | 1049 | 418 | 2142 |
| Barudelpola (530 B) | 896 | 997 | 423 | 1893 |
| Thoduwawa South (531) | 933 | 837 | 446 | 1770 |
| Thoduwawa North (531 A) | 1963 | 1774 | 892 | 3737 |
| Meda Thoduwawa (531 B) | 1105 | 1056 | 604 | 2161 |
| Iranawila West (532) | 2551 | 2412 | 1179 | 4963 |
| Iranawila East (532 A) | 815 | 725 | 385 | 1540 |
Population Distribution - According to Ethnicity
| Age Group | Ethnicity | |||||
| Sinhala | Tamil | Muslim | Burger | Other | Total | |
| Age 0 - 5 | 5344 | 110 | 8 | 0 | 0 | 5462 |
| Age 6 - 10 | 5049 | 99 | 2 | 0 | 0 | 5150 |
| Age 11 - 16 | 4703 | 107 | 3 | 1 | 0 | 4814 |
| Age 17 - 19 | 3572 | 114 | 1 | 0 | 0 | 3687 |
| Age 20 - 25 | 4925 | 109 | 7 | 0 | 0 | 5041 |
| Age 26 - 30 | 5288 | 98 | 4 | 1 | 0 | 5391 |
| Age 31 - 60 | 23157 | 386 | 13 | 3 | 2 | 23561 |
| Age 60 More than | 7590 | 171 | 5 | 2 | 1 | 7769 |
| Total | 59628 | 1194 | 43 | 7 | 3 | 60875 |
Population Distribution - According to Religion
| Age Group | Religion | |||||
| Buddhist | Hindu | Islam | Catholic | Other | Total | |
| Age 0 - 5 | 2391 | 70 | 13 | 2982 | 6 | 5462 |
| Age 6 - 10 | 2265 | 64 | 2 | 2787 | 32 | 5150 |
| Age 11 - 16 | 2047 | 51 | 5 | 2686 | 25 | 4814 |
| Age 17 - 19 | 1682 | 84 | 0 | 1902 | 19 | 3687 |
| Age 20 - 25 | 2167 | 80 | 5 | 2761 | 28 | 5041 |
| Age 26 - 30 | 2207 | 78 | 10 | 3046 | 50 | 5391 |
| Age 31 - 60 | 10526 | 220 | 11 | 12737 | 67 | 23561 |
| Age 60 More than | 3588 | 105 | 3 | 4036 | 37 | 7769 |
| Total | 26873 | 752 | 49 | 32937 | 264 | 60875 |
Rainfall Values
| Year | Annual Rainfall (M.M) | Times of Floods |
| 2010 | 1971 | |
| 2011 | 1100.9 | |
| 2012 | 1710.2 | |
| 2013 | 1205.7 | |
| 2014 | 2128.5 | |
| 2015 | 1763.5 | |
| 2016 | 954.5 | |
| 2017 | 937 | |
| 2018 | 1578 | |
| 2019 | 1388 | November |
| 2020 | 1058.5 | May |
