Monroe County, NY - Office of Historian Monroe County, New York, named for President James Monroe, was created from portions of Ontario and Genesee Counties on February 23, 1821. The county already included 28,000 settlers in growing towns and villages that provided agricultural products and market support for the burgeoning mill town known as Rochester. Monroe County, NY - GIS Data In April 2017, the Monroe County Department of Environmental Services-Geographic Information System (GIS) Services Division contracted XEOS Imaging to acquire LiDAR data over the entire county. A total of 9 missions were flown with a Cessna 206 Turbo aircraft (C-GPXA) equipped with a LiteMapper 6800 system including a Riegl LMS-Q680i 400 KHz