Sir yn nhalaith Florida , Unol Daleithiau America yw Jefferson County . Cafodd ei henwi ar ôl Thomas Jefferson . Sefydlwyd Jefferson County, Florida ym 1827 a sedd weinyddol y sir (a elwir weithiau'n 'dref sirol' neu'n 'brifddinas y sir') yw Monticello, Florida.
Mae ganddi arwynebedd o 1,649 cilometr sgwâr. Allan o'r arwynebedd hwn, y canran o ffurfiau dyfrol, megis llynnoedd ac afonydd , yw 6% . Yn ôl cyfrifiad y wlad, poblogaeth y sir yw: 14,510 (1 Ebrill 2020) [1] . Mewn cymhariaeth, yn 2016 roedd poblogaeth Caerdydd yn 361,462 a Rhyl tua 26,000.[2]
Mae'n ffinio gyda Thomas County, Brooks County, Madison County, Taylor County, Wakulla County, Leon County. Cedwir rhestr swyddogol o henebion ac adeiladau cofrestredig y sir yn: National Register of Historic Places listings in Jefferson County, Florida .
Map o leoliad y sir o fewn Florida Lleoliad Florida o fewn UDA
Ceir sawl sir o’r un enw gan gynnwys:
Jefferson County, Alabama Jefferson County, Arkansas Jefferson County, Colorado Jefferson County, Efrog Newydd Jefferson County, Florida Jefferson County, Georgia Jefferson County, Gorllewin Virginia Jefferson County, Idaho Jefferson County, Illinois Jefferson County, Indiana Jefferson County, Iowa Jefferson County, Kansas Jefferson County, Kentucky Jefferson County, Mississippi Jefferson County, Missouri Jefferson County, Montana Jefferson County, Nebraska
Mae gan y sir yma boblogaeth o tua 14,510 (1 Ebrill 2020) [1] . Dyma rai o'r dinasoedd, trefi neu gymunedau mwyaf poblog y sir:
Rhestr Wicidata:
Diwedd y rhestr a gynhyrchwyd yn otomatig o Wicidata.
Taleithiau Unol Daleithiau America Alabama , Alaska , Arizona , Arkansas , Califfornia , Colorado , Connecticut , Delaware , Florida , Georgia , Hawaii , Idaho , Illinois , Indiana , Iowa , Kansas , Kentucky , Louisiana , Maine , Maryland , Massachusetts , Michigan , Minnesota , Mississippi , Missouri , Montana , Nebraska , Nevada , New Hampshire , New Jersey , Mecsico Newydd , Efrog Newydd , Gogledd Dakota , Gogledd Carolina , Ohio , Oklahoma , Oregon , Pennsylvania , Rhode Island , De Dakota , De Carolina , Tennessee , Texas , Utah , Vermont , Virginia , Washington , Gorllewin Virginia , Wisconsin , Wyoming , District of Columbia , Samoa America , Ynysoedd Americanaidd y Wyryf , Guam , Ynysoedd Gogledd Mariana , Puerto Rico
Siroedd (a phrif drefi) o fewn talaith Florida Alachua County , Baker County , Bay County , Bradford County , Brevard County , Broward County , Calhoun County , Charlotte County , Citrus County , Clay County , Collier County , Columbia County , DeSoto County , Dixie County , Duval County , Escambia County , Flagler County , Franklin County , Gadsden County , Gilchrist County , Glades County , Gulf County , Hamilton County , Hardee County , Hendry County , Hernando County , Highlands County , Hillsborough County , Holmes County , Indian River County , Jackson County , Jefferson County , Lafayette County , Lake County , Lee County , Leon County , Levy County , Liberty County , Madison County , Manatee County , Marion County , Martin County , Miami-Dade County , Monroe County , Nassau County , Okaloosa County , Okeechobee County , Orange County , Osceola County , Palm Beach County , Pasco County , Pinellas County , Polk County , Putnam County , St. Johns County , St. Lucie County , Santa Rosa County , Sarasota County , Seminole County , Sumter County , Suwannee County , Taylor County , Union County , Volusia County , Wakulla County , Walton County , Washington County