Monuments is not listed as an active incorporated city, town, or census-designated place (CDP) in the state of Oklahoma by the United States Census Bureau or the Oklahoma Historical Society. It does not currently appear on official state administrative maps or in contemporary state municipal directories.
It is highly probable that Monuments refers to an exceedingly obscure unincorporated community, a historical settlement that has since been abandoned (such as a ghost town), or a data anomaly in certain geographic mapping systems. Because there is no established, active municipality by this name in the state, comprehensive civic, economic, demographic, and historical data does not exist in the public domain.
If you are planning a visit to Oklahoma to see actual monuments, the state is home to several significant and widely recognized sites—including the Oklahoma City National Memorial, the Washita Battlefield National Historic Site, and various state historical markers—though none of these are located within a municipality legally named Monuments.