1. RETICULATED (royal) PYTHON - 

Python reticulatus  

10.0 m / 30 ft

2. ANACONDA - 

Eunectes murinus 

8.5 m / 28 ft

3. INDIAN PYTHON - 

Python molurus molurus - 

7.6 m / 25 ft.

4. DIAMOND PYTHON - 

Morelia spilota spilota  

6.4 m / 21 ft.

 5.KING COBRA - 

Opiophagus hannah  

5.8 m / 19 ft.

 continued in:-

"LONGEST SNAKES IN THE WORLD"  - PART 2