The Chicago Board of Elections is urging voters who plan to cast their ballot by mail to return their Vote By Mail ballot via ballot drop box before April 3 in order for the ballots to be counted during election night on April 4. Secure drop boxes are available at all early voting sites including the supersite at 191 N. Clark St. and the Board of Elections offices at 69 W. Washington St. Applications to Vote By Mail in the April 4 runoff election close at 5 p.m. Thursday. All Vote By Mail ballots must be postmarked no later than April 4 and received by April 18 in order to be counted in the upcoming runoff election.