Postal addresses of all Electoral Registration Officers are available on the website of Election Commission of India / Chief Electoral Officers of respective State / Union Territory (link to which has been provided on the Election Commission of India website).
They can also be obtained from Indian Missions in Foreign countries.
Eligibility to be registered as a voter –
Every Indian citizen who has attained the age of 18 years on the qualifying date i.e. first day of January of the year of revision of electoral roll, unless otherwise disqualified, is eligible to be registered as a voter in the roll of the part/polling area of the constituency where he is ordinarily resident.
According to Section 14 (b) of the Representation of People Act, 1950 the relevant date (qualifying date) for determining the age of an applicant is the first day of January of the year in which the electoral roll is finally published.