In the middle of March, amidst discussion to finalise the allocation of constituencies, ADMK surprised its allies by unilaterally deciding the 160 constituencies in which it will field candidates.
The list included constituencies won by the CPI, CPM, Forward Bloc and Pudhiya Thamizhagam in the previous election.
Marumalarchi Dravida Munnetra Kazhagam (MDMK) was not allotted any constituency.
After the coalition partners threatened to form a third front under DMDK, ADMK gave in to their demands.
Most of the seats ADMK took from its alliance partners were given back bringing the standoff to an end.
However MDMK was not given the number of seats it asked for and hence Vaiko left ADMK led alliance and boycotted the elections.

The final seat allotment was:
In the middle of March, amidst discussion to finalise the allocation of constituencies, ADMK surprised its allies by unilaterally deciding the 160 constituencies in which it will field candidates. The list included constituencies won by the CPI, CPM, Forward Bloc and Pudhiya Thamizhagam in the previous election. Marumalarchi Dravida Munnetra Kazhagam (MDMK) was not allotted any constituency. After the coalition partners threatened to form a third front under DMDK, ADMK gave in to their demands. Most of the seats ADMK took from its alliance partners were given back bringing the standoff to an end. However MDMK was not given the number of seats it asked for and hence Vaiko left ADMK led alliance and boycotted the elections.
The final seat allotment was:
2011 Tamil Nadu Legislative Assembly election