Martinsburg Mining, Manufacturing & Improvement Co. Historic District is a national historic district located at Martinsburg, Berkeley County, West Virginia. It encompasses 289 contributing buildings located within 19 city blocks and built between 1891 and 1952. It includes a residential area developed by the Martinsburg Mining, Manufacturing & Improvement Co. as worker housing. They are one to 2 1/2 story, single family, detached, semi-detached, and multi-unit housing built in wood frame, brick or brick veneer, and concrete block. Also located in the district is the Gothic Revival-style St. Luke's United Methodist Church. It includes examples of vernacular interpretations of popular architectural styles including Queen Anne, American Four Square, and Bungalow styles.