The track from the band's self-titled 1997 album came top of the Digital Spy poll to find the group's best ever A-side with 14.2% of the vote.
In second place was 13's lead single 'Tender', followed by 'The Universal' from The Great Escape.
Parklife's 'Girls & Boys' came fourth while the Graham Coxon-fronted 'Coffee & TV' rounded out the top five.
The full top ten was as follows:
1. 'Song 2' - 14.2%
2. 'Tender' - 10.0%
3. 'The Universal' - 9.6%
4. 'Girls & Boys' - 8.8%
5. 'Coffee & TV' - 7.7.%
6. 'For Tomorrow' - 7.3%
7. 'Beetlebum' - 6.5%
= 8 'To the End' 6.2%
= 8 'Parklife' 6.2%
10. Country House - 5.0%
Blur last week played an intimate show at London's Maida Vale studios for BBC 6 Music and Radio 2.
The band headline a show at Hyde Park on August 12 to mark the end of the London 2012 Olympic games.
Blur last month released the double A-side single 'Under the Westway' and 'The Puritan' and last week unveiled the career-spanning 21 box-set.