Rhestr prifddinasoedd yr Unol Daleithiau

Mae Washington, D.C., wedi bod yn brifddinas Unol Daleithiau America ers 1800. Mae Cyngres yr Unol Daleithiau wedi cyfarfod wyth gwaith hyd yma mewn dinasoedd eraill, felly fe'u hystyrir yn brifddinasoedd hanesyddol. Ceir hefyd 50 o brifddinasoedd y taleithiau a phum prif rhanbarth, gyda'u prifddinasoedd eu hunain.

Prif Drefi Siroedd Unol Daleithiau America
Talaith	Talf.	Dyddiad creu'r dalaith	Prifddinas	Dyddiad sefydlu'r brifddinas	Arwynebedd (mi²)	Dinas mwyaf poblog	Poblogaeth y fwrdeistref	Poblogaeth y metropolis
Alabama	AL	1819	Montgomery	1846	155.4	Na	205,764	374,536
Alaska	AK	1959	Juneau	1906	2716.7	Na	31,275
Arizona	AZ	1912	Phoenix	1889	474.9	Ie	1,445,632	4,192,887
Arkansas	AR	1836	Little Rock	1821	116.2	Ie	193,524	877,091
Califfornia	CA	1850	Sacramento	1854	97.2	Na	466,488	2,527,123
Colorado	CO	1876	Denver	1867	153.4	Ie	600,158	2,552,195
Connecticut	CT	1788	Hartford	1875	17.3	Na	124,512	1,212,381
De Carolina	SC	1788	Columbia	1786	125.2	Ie	129,272	805,106
De Dakota	SD	1889	Pierre	1889	13.0	Na	13,646
Delaware	DE	1787	Dover	1777	22.4	Na	32,135
Efrog Newydd	NY	1788	Albany	1797	21.4	Na	97,856	857,592
Florida	FL	1845	Tallahassee	1824	95.7	Na	181,412	367,413
Georgia	GA	1788	Atlanta	1868	131.7	Ie	420,003	5,268,860
Gogledd Carolina ! Gogledd Carolina	NC	1789	Raleigh	1794	114.6	Na	403,892	1,130,490
Gogledd Dakota	ND	1889	Bismarck	1883	26.9	Na	61,272	108,779
Gorllewin Virginia ! Gorllewin Virginia	WV	1863	Charleston	1885	31.6	Ie	51,400	304,214
Hawaii	HI	1959	Honolulu	1845	85.7	Ie	337,256	953,207
Idaho	ID	1890	Boise	1865	63.8	Ie	205,671	616,561
Illinois	IL	1818	Springfield	1837	54.0	Na	116,250	208,182
Indiana	IN	1816	Indianapolis	1825	361.5	Ie	829,718	1,756,221
Iowa	IA	1846	Des Moines	1857	75.8	Ie	203,433	562,906
Kansas	KS	1861	Topeka	1856	56.0	Na	127,473	230,824
Kentucky	KY	1792	Frankfort	1792	14.7	Na	25,527	70,758
Louisiana	LA	1812	Baton Rouge	1880	76.8	Na	229,553	802,484
Maine	ME	1820	Augusta	1832	55.4	Na	19,136	117,114
Maryland	MD	1788	Annapolis	1694	6.73	Na	38,394
Massachusetts	MA	1788	Boston	1630	48.4	Ie	617,594	4,522,858
Mecsico Newydd	NM	1912	Santa Fe	1610	37.3	Na	75,764	183,732
Michigan	MI	1837	Lansing	1847	35.0	Na	114,297	464,036
Minnesota	MN	1858	Saint Paul	1849	52.8	Na	285,068	3,502,891
Mississippi	MS	1817	Jackson	1821	104.9	Ie	173,514	539,057
Missouri	MO	1821	Dinas Jefferson	1826	27.3	Na	43,079	149,807
Montana	MT	1889	Helena	1875	14.0	Na	28,190	74,801
Nebraska	NE	1867	Lincoln	1867	74.6	Na	258,379	302,157
Nevada	NV	1864	Carson City	1861	143.4	Na	55,274
New Hampshire	NH	1788	Concord	1808	64.3	Na	42,695
New Jersey	NJ	1787	Trenton	1784	7.66	Na	84,913	366,513
Ohio	OH	1803	Columbus	1816	210.3	Ie	787,033	1,836,536
Oklahoma	OK	1907	Dinas Oklahoma	1910	607.0	Ie	580,000	1,252,987
Oregon	OR	1859	Salem	1855	45.7	Na	154,637	390,738
Pennsylvania	PA	1787	Harrisburg	1812	8.11	Na	49,528	647,390
Rhode Island	RI	1790	Providence	1900	18.5	Ie	178,042	1,630,956
Tennessee	TN	1796	Nashville	1826	473.3	Na	635,710	1,582,264
Texas	TX	1845	Austin	1839	251.5	Na	790,390	1,716,291
Utah	UT	1896	Salt Lake City	1858	109.1	Ie	186,440	1,124,197
Vermont	VT	1791	Montpelier	1805	10.2	Na	7,855
Virginia	VA	1788	Richmond	1780	60.1	Na	204,214	1,231,675
Washington ! Washington	WA	1889	Olympia	1853	16.7	Na	46,478	234,670
Wisconsin	WI	1848	Madison	1838	68.7	Na	233,209	561,505
Wyoming	WY	1890	Cheyenne	1869	21.1	Ie	59,466	91,738