Lakes in Union County, Pennsylvania      Halfway Lake Lake McClure Mifflinburg Reservoir Spruce Run Reservoir OTHER COUNTIES NEARBY Adams County Berks County Bradford County Centre County Clinton County Columbia County Cumberland County Dauphin County Juniata County Lancaster County Lebanon County Luzerne County Lycoming County Mifflin County Montour County Northumberland County Perry County Potter County Schuylkill County Snyder County Sullivan County Tioga County Wyoming County York County Pennsylvania Lakes