Services will be at 4:00 p.m., Thursday, April 12, 2018, at Westminster Presbyterian Church. Private burial will be at Llano Cemetery. Arrangements are by Boxwell Brothers Funeral Directors, 2800 Paramount Blvd.
Harold was born July 9, 1924, in Floydada to A.J. and Lena Mitchell. He was a Navy veteran and served from 1942-1946, during World War II. Harold was an architect and owned Mitchell & Sims Architects.
He married Dorothy Lucas in 1954, in Carlsbad, New Mexico. She preceded him in death in June 2006.
Harold was a member of Amarillo Executive Association, Amarillo Planning and Zoning Commission, and Westminster Presbyterian Church.
Survivors include a son, Craig Mitchell and wife Stephanie, of Amarillo; a daughter, Kelly Smallwood and husband Tim, of Amarillo; a sister, Marietta Baird, of Howardwick; and two grandchildren, Yvette and Saira Smallwood.