| Sl.No | Year | Population | Variation | Percentage | Density |
| 1 | 1901 | 1339029 | - | - | 91 |
| 2 | 1911 | 1511222 | 172193 | (+)12.86 | 103 |
| 3 | 1921 | 1536868 | 25646 | (+)1.70 | 104 |
| 4 | 1931 | 1756477 | 219609 | (+)14.28 | 119 |
| 5 | 1941 | 1976743 | 220266 | (+)12.54 | 134 |
| 6 | 1951 | 2301822 | 325079 | (+)16.45 | 156 |
| 7 | 1961 | 2608375 | 306553 | (+)13.32 | 241 |
| 8 | 1971 | 3087262 | 478887 | (+)18.36 | 282 |
| 9 | 1981 | 3701040 | 613778 | (+)19.88 | 342 |
| 10 | 1991 | 4541222 | 840182 | (+)22.70 | 420 |
| 11 | 2001 | 4901420 | 360198 | (+)7.93 | 453 |
| 12 | 2011 | 5151549 | 250129 | (+)5.10 | 476 |
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