According to my analysis of data I’ve received from the Sedgwick County Election Office, 74,477 ballots have been mailed and 39,444 people have voted, either by mail or through in-person voting at the election office or advance voting centers.
For comparison, in the 2010 general election 136,398 people voted in Sedgwick County, and in the 2008 general election, 194,688.