Prince George's County Planning Department | 2,032 followers on LinkedIn. Mission: To promote economic vitality, environmental sustainability, design excellence, and quality development. | The Prince George's County Planning Department, as part of the Maryland-National Capital Park and Planning Commission, promotes economic vitality, environmental sustainability, design excellence, and quality development in Prince George’s County. Throughout 80-plus years of service, M-NCPPC has endeavored to improve the quality of life for all of the citizens of the bicounty area it serves and of the communities in which these citizens live, work, and raise their families. This mission is embodied in three major program areas.