Sir
|
Cod FIPS
[3]
|
Sedd sirol
[4]
|
Sefydlu
[4]
|
Tarddiad
|
Etymoleg
[5]
|
Poblogaeth
|
Maint
[4]
|
Map
|
| Adams County
|
001
|
Gettysburg
|
1800
|
Rhannau o York County.
|
John Adams
, ail
Arlywydd yr Unol Daleithiau
|
7005101407000000000
101,407
|
7002522000000000000
522 sq mi
(
7003135200000000000
1,352 km
2
)
|
|
| Allegheny County
|
003
|
Pittsburgh
|
1788
|
Rhannau o Washington County a Westmoreland County.
|
Enw mewn iaith brodorol am afon Allegheny - "yr afon hardd"
|
7006122334800000000
1,223,348
|
7002745000000000000
745 sq mi
(
7003193000000000000
1,930 km
2
)
|
|
| Armstrong County
|
005
|
Kittanning
|
1800
|
Rhannau o siroedd Allegheny, Lycoming, a Westmoreland.
|
John Armstrong, cadfridog yn
Rhyfel Annibyniaeth America
|
7004689410000000000
68,941
|
7002664000000000000
664 sq mi
(
7003172000000000000
1,720 km
2
)
|
|
| Beaver County
|
007
|
Beaver
|
1800
|
Rhannau o Allegheny a Washington Counties.
|
Cafodd ei henwi ar ol Afon Beaver
|
7005170539000000000
170,539
|
7002444000000000000
444 sq mi
(
7003115000000000000
1,150 km
2
)
|
|
| Bedford County
|
009
|
Bedford
|
1771
|
Rhannau o Cumberland County.
|
John Russell, 4ydd Dug Bedford
|
7004497620000000000
49,762
|
7003101500000000000
1,015 sq mi
(
7003262900000000000
2,629 km
2
)
|
|
| Berks County
|
011
|
Reading
|
1752
|
Rhannau o Chester, Lancaster a Philadelphia Counties.
|
Berkshire
,
Lloegr
|
7005411442000000000
411,442
|
7002866000000000000
866 sq mi
(
7003224300000000000
2,243 km
2
)
|
|
| Blair County
|
013
|
Hollidaysburg
|
1846
|
Rhannau o Siroedd Huntingdon a Bedford.
|
John Blair, gwleidydd o Pennsylvania
|
7005127089000000000
127,089
|
7002527000000000000
527 sq mi
(
7003136500000000000
1,365 km
2
)
|
|
| Bradford County
|
015
|
Towanda
|
1810
|
Rhannau o siroedd Luzerne a Lycoming; Ontario County, yn wreiddiol ailenwyd fel Bradford County ym 1812.
|
William Bradford, ail Dwrnai Cyffredinol yr UD
|
7004626220000000000
62,622
|
7003116100000000000
1,161 sq mi
(
7003300700000000000
3,007 km
2
)
|
|
| Bucks County
|
017
|
Doylestown
|
1682
|
Un o'r siroedd gwreiddiol yn ffurfiad Pennsylvania
|
Buckinghamshire
Lloegr
|
7005625249000000000
625,249
|
7002622000000000000
622 sq mi
(
7003161100000000000
1,611 km
2
)
|
|
| Butler County
|
019
|
Butler
|
1800
|
Rhannau o Allegheny County.
|
Richard Butler, cadfridog yn
Rhyfel Annibyniaeth America
|
7005183862000000000
183,862
|
7002795000000000000
795 sq mi
(
7003205900000000000
2,059 km
2
)
|
|
| Cambria County
|
021
|
Ebensburg
|
1804
|
Rhannau o Siroedd Somerset a Huntingdon.
|
Cambria
, enw rhamantaidd am
Gymru
|
7005143679000000000
143,679
|
7002693000000000000
693 sq mi
(
7003179500000000000
1,795 km
2
)
|
|
| Cameron County
|
023
|
Emporium
|
1860
|
Rhannau o Siroedd Clinton, Elk, McKean, a Potter.
|
Simon Cameron, Seneddwr o Pennsylvania
|
7003508500000000000
5,085
|
7002399000000000000
399 sq mi
(
7003103300000000000
1,033 km
2
)
|
|
| Carbon County
|
025
|
Jim Thorpe
|
1843
|
Rhannau o Siroedd Monroe a Northampton.
|
Carbon
yw brif elfen
glo
, mae'r sir yn enwog am ei faes glo
|
7004652490000000000
65,249
|
7002387000000000000
387 sq mi
(
7003100200000000000
1,002 km
2
)
|
|
| Centre County
|
027
|
Bellefonte
|
1800
|
Rhannau o Siroedd Lycoming, Mifflin, Northumberland, a Huntingdon.
|
Ffwrnais Center Furnance, y cyfleuster diwydiannol cyntaf yn yr ardal
|
7005153990000000000
153,990
|
7003111200000000000
1,112 sq mi
(
7003288000000000000
2,880 km
2
)
|
|
| Chester County
|
029
|
West Chester
|
1682
|
Un o'r siroedd gwreiddiol yn ffurfiad Pennsylvania.
|
Dinas
Caer
(Saesneg
Chester
),
Lloegr
|
7005498886000000000
498,886
|
7002760000000000000
760 sq mi
(
7003196800000000000
1,968 km
2
)
|
|
| Clarion County
|
031
|
Clarion
|
1839
|
Rhannau o siroedd Venango ac Armstrong
|
Cafodd ei henwi ar ol Afon Clarion
|
7004399880000000000
39,988
|
7002609000000000000
609 sq mi
(
7003157700000000000
1,577 km
2
)
|
|
| Clearfield County
|
033
|
Clearfield
|
1804
|
Rhannau o Siroedd Lycoming a Huntingdon
|
Y caeau wedi'u clirio trwy goedio yn yr ardal
|
7004816420000000000
81,642
|
7003115400000000000
1,154 sq mi
(
7003298900000000000
2,989 km
2
)
|
|
| Clinton County
|
035
|
Lock Haven
|
1839
|
Rhannau o Siroedd Lycoming a Centre.
|
DeWitt Clinton, llywodraethwr Efrog Newydd
|
7004392380000000000
39,238
|
7002898000000000000
898 sq mi
(
7003232600000000000
2,326 km
2
)
|
|
| Columbia County
|
037
|
Bloomsburg
|
1813
|
Rhannau o siroedd Northumberland a Luzerne.
|
Columbia, enw rhamantaidd am yr Unol Daleithiau
|
7004672950000000000
67,295
|
7002490000000000000
490 sq mi
(
7003126900000000000
1,269 km
2
)
|
|
| Crawford County
|
039
|
Meadville
|
1800
|
Rhannau o Allegheny County.
|
William Crawford, syrfewr a helpodd i agor tiroedd traws-Appalachian i anheddiad
|
7004887650000000000
88,765
|
7003103800000000000
1,038 sq mi
(
7003268800000000000
2,688 km
2
)
|
|
| Cumberland County
|
041
|
Carlisle
|
1750
|
Rhannau o Lancaster County.
|
Sir hanesyddol
Cumberland
Lloegr
|
7005235406000000000
235,406
|
7002551000000000000
551 sq mi
(
7003142700000000000
1,427 km
2
)
|
|
| Dauphin County
|
043
|
Harrisburg
|
1785
|
Rhannau o Lancaster County.
|
Louis-Joseph, Dauphin Ffrainc
|
7005268100000000000
268,100
|
7002558000000000000
558 sq mi
(
7003144500000000000
1,445 km
2
)
|
|
| Delaware County
|
045
|
Media
|
1789
|
Rhannau o Chester County.
|
Cafodd ei henwi ar ol Afon Delaware a enwyd ar ol Thomas West, 3rd Barwn De La Warr
|
7005558979000000000
558,979
|
7002191000000000000
191 sq mi
(
7002495000000000000
495 km
2
)
|
|
| Elk County
|
047
|
Ridgway
|
1843
|
Rhannau o Siroedd Jefferson, McKean, a Clearfield.
|
Y carw
Cervus Canadensis
(Saesneg
Elk
), sy'n byw yn y sir goediog
|
7004319460000000000
31,946
|
7002832000000000000
832 sq mi
(
7003215500000000000
2,155 km
2
)
|
|
| Erie County
|
049
|
Erie
|
1800
|
Rhannau o Allegheny County; yn rhan o Crawford County hyd 1803.
|
Llyn Erie
|
7005280566000000000
280,566
|
7002799000000000000
799 sq mi
(
7003206900000000000
2,069 km
2
)
|
|
| Fayette County
|
051
|
Uniontown
|
1783
|
Rhannau o Westmoreland County.
|
Marquis de Lafayette, cadfridog Ffrengig yn
Rhyfel Annibyniaeth America
|
7005136606000000000
136,606
|
7002798000000000000
798 sq mi
(
7003206700000000000
2,067 km
2
)
|
|
| Forest County
|
053
|
Tionesta
|
1848
|
Rhannau o Jefferson County; wedi ei gysylltu a Jefferson County hyd 1857.
|
Prif nodwedd naturiol
|
7003771600000000000
7,716
|
7002431000000000000
431 sq mi
(
7003111600000000000
1,116 km
2
)
|
|
| Franklin County
|
055
|
Chambersburg
|
1784
|
Rhannau o Cumberland County.
|
Er anrhydedd i
Benjamin Franklin
|
7005149618000000000
149,618
|
7002771000000000000
771 sq mi
(
7003199700000000000
1,997 km
2
)
|
|
| Fulton County
|
057
|
McConnellsburg
|
1850
|
Rhannau o Bedford County.
|
Robert Fulton, ddyfeisid y cwch ager Americanaidd
|
7004148450000000000
14,845
|
7002438000000000000
438 sq mi
(
7003113400000000000
1,134 km
2
)
|
|
| Greene County
|
059
|
Waynesburg
|
1796
|
Rhannau o Washington County.
|
Nathanael Greene, Cadfridog yn
Rhyfel Annibyniaeth America
|
7004386860000000000
38,686
|
7002578000000000000
578 sq mi
(
7003149700000000000
1,497 km
2
)
|
|
| Huntingdon County
|
061
|
Huntingdon
|
1787
|
Rhannau o Bedford County.
|
Sir hanesyddol
Huntingdonshire
,
Lloegr
|
7004459130000000000
45,913
|
7002889000000000000
889 sq mi
(
7003230200000000000
2,302 km
2
)
|
|
| Indiana County
|
063
|
Indiana
|
1803
|
Rhannau o Siroedd Lycoming a Westmoreland Counties; roedd yn gysylltiedig a Westmoreland County hyd 1806.
|
Americaniad Brodorol
|
7004888800000000000
88,880
|
7002834000000000000
834 sq mi
(
7003216000000000000
2,160 km
2
)
|
|
| Jefferson County
|
065
|
Brookville
|
1804
|
Rhannau o Lycoming County. Roedd yn gysylltiedig a Westmoreland County hyd 1806 a Indiana County hyd 1830.
|
Er anrhydedd i'r Arlywydd
Thomas Jefferson
|
7004452000000000000
45,200
|
7002657000000000000
657 sq mi
(
7003170200000000000
1,702 km
2
)
|
|
| Juniata County
|
067
|
Mifflintown
|
1831
|
Rhannau o Mifflin County.
|
Cafodd ei henwi ar ol Afon Juniata
|
7004246360000000000
24,636
|
7002394000000000000
394 sq mi
(
7003102000000000000
1,020 km
2
)
|
|
| Lackawanna County
|
069
|
Scranton
|
1878
|
Rhannau o Luzerne County.
|
Cafodd ei henwi ar ol Afon Lackawanna
|
7005214437000000000
214,437
|
7002465000000000000
465 sq mi
(
7003120400000000000
1,204 km
2
)
|
|
| Lancaster County
|
071
|
Lancaster
|
1729
|
Rhannau o Chester County.
|
Dinas
Caerhirfryn
(Saesneg:
Lancaster
)
|
7005519445000000000
519,445
|
7002984000000000000
984 sq mi
(
7003254900000000000
2,549 km
2
)
|
|
| Lawrence County
|
073
|
New Castle
|
1849
|
Rhannau o Beaver a Mercer Counties.
|
James Lawrence, capten yn
Rhyfel 1812
|
7004911080000000000
91,108
|
7002363000000000000
363 sq mi
(
7002940000000000000
940 km
2
)
|
|
| Lebanon County
|
075
|
Lebanon
|
1813
|
Rhannau o Siroedd Dauphin a Lancaster.
|
Libanus (Saesneg:
Lebanon
), y term
Beiblaidd
am "Fynydd Gwyn", sy'n cyfeirio at dduwioldeb sylfaenwyr y sir oedd yn perthyn i enwad y Morafiaid
|
7005133568000000000
133,568
|
7002363000000000000
363 sq mi
(
7002940000000000000
940 km
2
)
|
|
| Lehigh County
|
077
|
Allentown
|
1812
|
Rhannau o Northampton County.
|
Cafodd ei henwi ar ol Afon Lehigh
|
7005349497000000000
349,497
|
7002349000000000000
349 sq mi
(
7002904000000000000
904 km
2
)
|
|
| Luzerne County
|
079
|
Wilkes-Barre
|
1786
|
Rhannau o Northumberland County.
|
Anne-Cesar, Chevalier de la Luzerne, Llysgennad Ffrainc i'r Unol Daleithiau a gynorthwyodd achosion gweriniaethol
|
7005320918000000000
320,918
|
7002907000000000000
907 sq mi
(
7003234900000000000
2,349 km
2
)
|
|
| Lycoming County
|
081
|
Williamsport
|
1795
|
Rhannau o Northumberland County.
|
Cafodd ei henwi ar ol Cilfachell Lycoming
|
7005116111000000000
116,111
|
7003124400000000000
1,244 sq mi
(
7003322200000000000
3,222 km
2
)
|
|
| McKean County
|
083
|
Smethport
|
1804
|
Rhannau o Lycoming County; cysylltiedig a Centre County hyd 1814 a Lycoming County hyd 1826.
|
Er anrhydedd i Thomas McKean, Llywodraethwr Pennsylvania
|
7004434500000000000
43,450
|
7002984000000000000
984 sq mi
(
7003254900000000000
2,549 km
2
)
|
|
| Mercer County
|
085
|
Mercer
|
1800
|
Rhannau o Allegheny County.
|
Hugh Mercer, Cadfridog yn
Rhyfel Annibyniaeth America
|
7005116638000000000
116,638
|
7002683000000000000
683 sq mi
(
7003176900000000000
1,769 km
2
)
|
|
| Mifflin County
|
087
|
Lewistown
|
1789
|
Rhannau o Cumberland a Northumberland.
|
Thomas Mifflin Llywodraethwr Pennsylvania
|
7004466820000000000
46,682
|
7002415000000000000
415 sq mi
(
7003107500000000000
1,075 km
2
)
|
|
| Monroe County
|
089
|
Stroudsburg
|
1836
|
Rhannau o Pike a Northampton Counties.
|
Yr arlywydd
James Monroe
|
7005169842000000000
169,842
|
7002617000000000000
617 sq mi
(
7003159800000000000
1,598 km
2
)
|
|
| Montgomery County
|
091
|
Norristown
|
1784
|
Rhannau o Philadelphia County.
|
Sir Drefaldwyn
sir hanesyddol Gymreig
|
7005799874000000000
799,874
|
7002487000000000000
487 sq mi
(
7003126100000000000
1,261 km
2
)
|
|
| Montour County
|
093
|
Danville
|
1850
|
Rhannau o Columbia County.
|
Madame Montour, llysgennad trefedigaethol i'r Americanwyr Brodorol
|
7004182670000000000
18,267
|
7002132000000000000
132 sq mi
(
7002342000000000000
342 km
2
)
|
|
| Northampton County
|
095
|
Easton
|
1752
|
Rhannau o Bucks County.
|
Tref
Northampton
,
Lloegr
|
7005297735000000000
297,735
|
7002377000000000000
377 sq mi
(
7002976000000000000
976 km
2
)
|
|
| Northumberland County
|
097
|
Sunbury
|
1772
|
Rhannau o Siroedd Lancaster, Berks, Bedford, Cumberland, a Northampton.
|
Sir
Northumberland
,
Lloegr
|
7004945280000000000
94,528
|
7002477000000000000
477 sq mi
(
7003123500000000000
1,235 km
2
)
|
|
| Perry County
|
099
|
New Bloomfield
|
1820
|
Rhannau o Cumberland County.
|
Oliver Hazard Perry, llyngesydd yn
Rhyfel 1812
|
7004459690000000000
45,969
|
7002556000000000000
556 sq mi
(
7003144000000000000
1,440 km
2
)
|
|
| Philadelphia County
|
101
|
Philadelphia
|
1682
|
Un o'r siroedd gwreiddiol yn ffurfiad Pennsylvania.
|
"Cariad Frawdol" o'r
Roeg
philos
("cariad") ac
adelphos
("brawd")
|
7006152600600000000
1,526,006
|
7002143000000000000
143 sq mi
(
7002370000000000000
370 km
2
)
|
|
| Pike County
|
103
|
Milford
|
1814
|
Rhannau o Wayne County.
|
Zebulon Pike, fforiwr Gorllewin America
|
7004573690000000000
57,369
|
7002567000000000000
567 sq mi
(
7003146900000000000
1,469 km
2
)
|
|
| Potter County
|
105
|
Coudersport
|
1804
|
O Lycoming county..
|
James Potter, Cadfridog yn
Rhyfel Annibyniaeth America
|
7004174570000000000
17,457
|
7003108100000000000
1,081 sq mi
(
7003280000000000000
2,800 km
2
)
|
|
| Schuylkill County
|
107
|
Pottsville
|
1811
|
Rhannau o Siroedd Berks a Northampton.
|
Cafodd ei henwi ar ol Afon Schuylkill
|
7005148289000000000
148,289
|
7002778000000000000
778 sq mi
(
7003201500000000000
2,015 km
2
)
|
|
| Snyder County
|
109
|
Middleburg
|
1855
|
Rhannau o Union County.
|
Simon Snyder, Llywodraethwr Pennsylvania
|
7004397020000000000
39,702
|
7002332000000000000
332 sq mi
(
7002860000000000000
860 km
2
)
|
|
| Somerset County
|
111
|
Somerset
|
1795
|
Rhannau o Bedford County.
|
Gwlad yr Haf
(Saesneg:
Somerset
) Lloegr
|
7004777420000000000
77,742
|
7003108100000000000
1,081 sq mi
(
7003280000000000000
2,800 km
2
)
|
|
| Sullivan County
|
113
|
Laporte
|
1847
|
Rhannau o Lycoming County
|
John Sullivan, Cadfridog yn
Rhyfel Annibyniaeth America
|
7003642800000000000
6,428
|
7002452000000000000
452 sq mi
(
7003117100000000000
1,171 km
2
)
|
|
| Susquehanna County
|
115
|
Montrose
|
1810
|
Rhannau o Luzerne County.
|
Cafodd ei henwi ar ol Afon Susquehanna
|
7004433560000000000
43,356
|
7002832000000000000
832 sq mi
(
7003215500000000000
2,155 km
2
)
|
|
| Tioga County
|
117
|
Wellsboro
|
1804
|
Rhannau o Lycoming County; attached to Lycoming until 1812.
|
Cafodd ei henwi ar ol Afon Tioga
|
7004419810000000000
41,981
|
7003113700000000000
1,137 sq mi
(
7003294500000000000
2,945 km
2
)
|
|
| Union County
|
119
|
Lewisburg
|
1813
|
Rhannau o Northumberland County.
|
Ochr yr Undeb yn
Rhyfel Cartref America
|
7004449470000000000
44,947
|
7002317000000000000
317 sq mi
(
7002821000000000000
821 km
2
)
|
|
| Venango County
|
121
|
Franklin
|
1800
|
Rhannau o Siroedd Allegheny a Lycoming.
|
Llygriad o air o iaith frodorol
onenge
, sy'n golygu
Dwrgi
|
7004549840000000000
54,984
|
7002683000000000000
683 sq mi
(
7003176900000000000
1,769 km
2
)
|
|
| Warren County
|
123
|
Warren
|
1800
|
Rhannau o Siroedd Allegheny a Lycoming.
|
Joseph Warren, Cadfridog yn
Rhyfel Annibyniaeth America
|
7004418150000000000
41,815
|
7002898000000000000
898 sq mi
(
7003232600000000000
2,326 km
2
)
|
|
| Washington County
|
125
|
Washington
|
1781
|
Rhannau o Westmoreland County.
|
Er anrhydedd i'r Arlywydd
George Washington
|
7005207820000000000
207,820
|
7002861000000000000
861 sq mi
(
7003223000000000000
2,230 km
2
)
|
|
| Wayne County
|
127
|
Honesdale
|
1798
|
Rhannau o Northampton County.
|
Anthony Wayne, Cadfridog yn
Rhyfel Annibyniaeth America
|
7004528220000000000
52,822
|
7002751000000000000
751 sq mi
(
7003194500000000000
1,945 km
2
)
|
|
| Westmoreland County
|
129
|
Greensburg
|
1773
|
Rhannau o Bedford County.
|
Sir hanesyddol
Westmorland
,
Lloegr
|
7005365169000000000
365,169
|
7003103600000000000
1,036 sq mi
(
7003268300000000000
2,683 km
2
)
|
|
| Wyoming County
|
131
|
Tunkhannock
|
1842
|
Rhannau o Luzerne County.
|
Gair frodorol sy'n golygu "ger yr afon fawr gwastad"
|
7004282760000000000
28,276
|
7002405000000000000
405 sq mi
(
7003104900000000000
1,049 km
2
)
|
|
| York County
|
133
|
York
|
1749
|
Rhannau o Lancaster County.
|
Dinas
Efrog
,
Lloegr
(Saesneg:
York
)
|
7005434972000000000
434,972
|
7002910000000000000
910 sq mi
(
7003235700000000000
2,357 km
2
)
|
|