07: Where can I drop off my mail-in ballot in person within McLennan County in Texas?Source: http://www.co.mclennan.tx.us/337/Elections214 N 4th Street, Suite 300, Waco, TX 76701 ← 07: Where can I drop off my mail-in ballot in person within Lynn County in Texas? → 07: Where can I drop off my mail-in ballot in person within Parker County in Texas?