sidneyThe City of Sidney was recently awarded $48,300 in the third round of grant funding by Ohio EPA’s H2Ohio Rivers Chloride Reduction Grant Program. Read on... Sidney PoliceSidney is a city in and the county seat of Richland County, Montana, United States, [4] less than 10 mi (16 km) west of the North Dakota border. The population was 6,346 at the 2020 census.