- P.O. Box 268, FM 50 Mumford, Texas 77867 Phone: (979)279-3678 Fax: (979)279-5044 Mumford School currently has about 450 students spanning grades pre-k through 11th grade. Mumford will have its first class of graduating seniors during the 2002-2003 school year. Along with its first graduating class, Mumford will open a new building on its campus in August of 2002. The new building will house ...www.mumford.k12.tx.us