Contact Us Requests for historic marker applications and requests for items to be placed on MCHC's meeting agenda should be made to Clint Lynch, firstname.lastname@example.org Or fill out the form below. Mailing Address: McLennan County Historical Commission P. O. Box 311 Waco, Texas 76703-0311 Your name Please enter your name. Your email Please enter a valid email. Your message Please enter a message. Send Message failed. Please try again. Thanks for your message! We’ll be in touch soon.