Sir yn nhalaith Efrog Newydd , Unol Daleithiau America yw Bronx County . Cafodd ei henwi ar ôl Jonas Bronck. Sefydlwyd Bronx County, Efrog Newydd ym 1914. I bob pwrpas Bronx County yw'r un peth â'r Bronx , bwrdeistref Dinas Efrog Newydd .
Mae'n ffinio gyda Queens County, Efrog Newydd County, Bergen County, Westchester County, Nassau County.
Map o leoliad y sir o fewn Efrog Newydd
Lleoliad Efrog Newydd o fewn UDA
Siroedd (a phrif drefi) o fewn talaith Efrog Newydd Efrog Newydd County , Albany County , Allegany County , Bronx County , Broome County , Cattaraugus County , Cayuga County , Chautauqua County , Chemung County , Chenango County , Clinton County , Columbia County , Cortland County , Delaware County , Dutchess County , Erie County , Essex County , Franklin County , Fulton County , Genesee County , Greene County , Hamilton County , Herkimer County , Jefferson County , Kings County , Lewis County , Livingston County , Madison County , Monroe County , Montgomery County , Nassau County , Niagara County , Oneida County , Onondaga County , Ontario County , Orange County , Orleans County , Oswego County , Otsego County , Putnam County , Queens County , Rensselaer County , Richmond County , Rockland County , Saratoga County , Schenectady County , Schoharie County , Schuyler County , Seneca County , St. Lawrence County , Steuben County , Suffolk County , Sullivan County , Tioga County , Tompkins County , Ulster County , Warren County , Washington County , Wayne County , Westchester County , Wyoming County , Yates County