Ambur has got a population of 75911 as per the Census 1991. This shows 14.94% increase over the decade of 1981. The growth of population for Ambur from 1901 to 2001 is shown below.
Population Growth
| Year | Population |
| 1901 | 15903 |
| 1911 | 18204 |
| 1921 | 19220 |
| 1931 | 24217 |
| 1941 | 31700 |
| 1951 | 39992 |
| 1961 | 39455 |
| 1971 | 54011 |
| 1981 | 66042 |
| 1991 | 75911 |
| 2001 | 99624 |
| 2011 | 114608 |
Density
Spread over an area of 17.97 sq.km. the town has a density of 2200 persons/sq.km. in 1961 with rapid growth of population the density rose to 3675 persons / sq.km. in 1981 and to 4200 persons / sq.km. by 1991.
Literacy Rates
The percentage of Literacy has been increasing during the decades of 1981 and 1992. The literacy rate has increased to 57.63% in the year 1991 from 54.46% in the year 1981.
| Ward No. | Male | Female | Population |
| 1 | 1999 | 1609 | 3608 |
| 2 | 1710 | 1458 | 3168 |
| 3 | 1197 | 1102 | 2299 |
| 4 | 1167 | 998 | 2165 |
| 5 | 801 | 711 | 1512 |
| 6 | 695 | 611 | 1306 |
| 7 | 919 | 730 | 1649 |
| 8 | 861 | 688 | 1549 |
| 9 | 1127 | 996 | 2123 |
| 10 | 900 | 615 | 1515 |
| 11 | 966 | 853 | 1819 |
| 12 | 693 | 600 | 1293 |
| 13 | 896 | 814 | 1710 |
| 14 | 869 | 755 | 1624 |
| 15 | 931 | 818 | 1749 |
| 16 | 786 | 719 | 1505 |
| 17 | 1034 | 872 | 1906 |
| 18 | 887 | 808 | 1695 |
| 19 | 1391 | 1276 | 2667 |
| 20 | 608 | 534 | 1142 |
| 21 | 1406 | 1349 | 2755 |
| 22 | 1867 | 1650 | 3517 |
| 23 | 737 | 737 | 1339 |
| 24 | 691 | 627 | 1318 |
| 25 | 754 | 708 | 1462 |
| 26 | 841 | 726 | 1567 |
| 27 | 806 | 689 | 1495 |
| 28 | 939 | 749 | 1688 |
| 29 | 1477 | 1313 | 2790 |
| 30 | 869 | 864 | 1733 |
| 31 | 555 | 453 | 1008 |
| 32 | 959 | 805 | 1764 |
| 33 | 1024 | 881 | 1905 |
| 34 | 773 | 745 | 1518 |
| 35 | 1663 | 1502 | 3165 |
| 36 | 1449 | 1233 | 2682 |
| Total | 37247 | 32463 | 69710 |