The following are standard abbreviations employed to identify the United States and Canadian Provinces by their respective postal services. The other country and regional codes have been selected from the very useful and detailed Roots Surname List of Abbreviations.

This shorter list has been developed to be a key to the geographies that tend to be the focus of Members' Genealogical Research Interests page.

Country Codes (with links to regional codes)

AUS	Australia	AUT	Austria	BEL	Belgium	BMU	Bermuda
CAN	Canada	CHI	Channel Islands	CHN	China	CZE	Czech Republic
CSK	Czechoslovakia	DNK	Denmark	ENG	England	FIN	Finland
FRA	France	DEU	Germany	GBR	Great Britain	HOL	Holland
HUN	Hungary	IRL	Ireland	ITA	Italy	KEN	Kenya
LUX	Luxenburg	LTU	Lithuania	MDA	Moldavia	NLD	Netherlands
NIR	Northern Ireland	NZL	New Zealand	NOR	Norway	PHL	Philippines
POL	Poland	ROM	Romania	RUS	Russia	SCT	Scotland
ZAF	South Africa	SWE	Sweden	CHE	Switzerland	UKR	Ukraine
UK	United Kingdom	UEL	United Empire Loyalist	USA	United States	VEN	Venezuela
WLS	Wales	WW	Worldwide

Australia

ACT	Australian Capital Territory	NSW	New South Wales	NT	Northern Territory	QLD	Queensland
SA	South Australia	TAS	Tasmania	VIC	Victoria	WA	Western Australia

Canada

AB	Alberta	BC	British Columbia	MB	Manitoba	NB	New Brunswick
NF	Newfoundland	NS	Nova Scotia	NT	Northwest Territories	ON	Ontario
QC	Quebec	PE	Prince Edward Island	SK	Saskatchewan	YK	Yukon
AC	Acadia

Channel Islands

ALD

Alderney

GSY

Guernsey

JSY

Jersey

SRK

Sark

England

AVN	Avon	BDF	Bedfordshire	BRK	Berkshire	BKM	Buckinghamshire
CAM	Cambridgeshire	CHS	Cheshire	CLV	Cleveland	CON	Cornwall
CUL	Cumberland	CMA	Cumbria	DBY	Derbyshire	DEV	Devon or Devonshire
DOR	Dorset	DUR	Durham	EAG	East Anglia	ERY	East Riding
SXE	East Sussex	ESS	Essex	GLS	Gloucestershire	HAM	Hampshire/ Hantshaving
HWR	Hereford and Worcester	HEF	Herefordshire	HRT	Hertfordshire	HUM	Humberside
HUN	Huntingdonshire	IOW	Isle of Wight	KEN	Kent	LAN	Lancashire
LEI	Leicestershire	LIN	Lincolnshire	LND	London	GTM	Manchester, Greater
MCA	Mercia	MSY	Merseyside	MDX	Middlesex	MID	Midlands
NFK	Norfolk	NRY	North Riding	NYK	North Yorkshire	NTH	Northampton
NBL	Northumberland	NTT	Nottinghamshire	OXF	Oxfordshire/ Oxon	RUT	Rutland
SAL	Shropshire/Salop	SOM	Somerset	SYK	South Yorkshire	STS	Staffordshire
SFK	Suffolk	SRY	Surrey	SSX	Sussex	T&W	Tyne & Wear
WAR	Warwickshire	WSX	Wessex	WMD	West Midlands	WRY	West Riding
SXW	West Sussex	WYK	West Yorkshire	WES	Westmoreland	WIL	Wiltshire
WOR	Worcestershire	YKS	Yorkshire

Germany

ELS	Alsace/Elsaß	ELS-LOT	Alsace-Lorraine/ Elsasz-Lothringen	ANH	Anhalt	ANB-ANH	Anhalt-Bernburg
AND-ANH	Anhalt-Dessau	ANK-ANH	Anhalt-Köthen	BAD	Baden	BAD-WUE	Baden-Württenberg
BAY	Bavaria/Bayern	BER	Berlin (Land in Bundesrepublik)	BER-PRU	Berlin, Stadt (city)	BRG	Brandenburg
BRU	Braunschweig/ Brunswick	BRS-BAD	Breisgau	BRE	Bremen	OPRU	East Prussia/ Ostpreußen
FRN-BAY	Franconia/Franken	FRK	Frankfurt-Main	HAM	Hamburg	HAN	Hannover/Hanover
HES	Hesse/Hessen	HD-HES	Hesse-Darmstadt/ Hessen-Darmstadt	HK-HES	Hesse-Kassel/ Hessen-Kassel/ Electorate of Hesse/Kurhessen	HOM-HES	Hessen-Homburg
HOH	Hohenzollern	HOS-SCN	Holstein	LAU	Laünberg	LPD	Lippe-Detmold
LOT	Lorraine/Lothringen	NSAC	Lower Saxony/Niedersachsen	LUB	Lübeck	MST-MEC	Meckenlenburg- Strelitz
MEC	Mecklenburg	MEC- VPOM	Mecklenburg-Hither (Western) Pomerania/ Mecklenbury- Vorpommern	MSC-MEC	Mecklenburg- Schwerin	MST-MEC	Mecklenburg- Strelitz
NAS	Nassau	NRHE-WFA	Nordrhein-Westfalen/ North Rhine- Westphalia	OBP-BAY	Oberpfalz/ Upper Palatinate	OLD	Oldenburg
PFA-BAY	Palatinate/Pfalz	POM-PRU	Pomerania/Pommern	POS-PRU	Posen/Pozna'n	PRU	Preußen/Prussia
AL-RES	Reuß altere Linie/Reuß Greiz	JL-RES	Reuß jüngere Linie (Reuß-Ebersdorf, Lobenstein, and -Schleiz)	RES	Reuß	RHE-PRU	Rheinland/ Rhineland
RHE-PFA	Rheinland-Pfalz/ Rhineland-Palatinate	SAA	Saarland	SXM-THE	Sachsen-Meiningen/ Saxe-Meiningen	SAC-PRU	Sachsen (Provinz)/ Saxony (Prussian Province)
SAC	Sachsen (Kgr. /Land in Bundesrepublik)/ Saxony (Kingdom/State)	SXW-THE	Sachsen-Weimar/ Saxe-Weimar	SXG-THE	Sachsen-Gotha- Altenburg/ Saxe-Gotha- Altenburg	SXC-THE	Sachsen-Coburg und Gotha/ Sachsen-Coburg- Saalfeld
SXA-THE	Sachsen-Altenburg/ Saxe-Altenburg	SAC-ANH	Sachsen-Anhalt/ Saxony-Anhalt	SXH-THE	Sachsen-Hildburghausen/ Saxe- Hildburghausen	SLP	Schaumburg-Lippe
SCI-PRU	Schlesien/Silesia	SCL-SCN	Schleswig	SCN	Schleswig-Holstein	SCH	Schwarzburg
RUD-SCH	Schwarzburg- Rudolstadt	SON-SCH	Schwarzburg- Sondershausen	SUD	Sudetenland	THE	Thüringen/Thuringia
WAL	Waldeck/Waldeck und Pyrmont	WPRU	West Prussia/ Westpreußen	WFA-PRU	Westfalen/ Westphalia	WUE	Wùrttemberg/ Wurttemberg

Ireland

CAR	Carlow	CAV	Cavan	CLA	Clare	CNN	Connaught
COR	Cork	DON	Donegal	DUB	Dublin	GAL	Galway
KER	Kerry	KID	Kildare	KIK	Kilkenny	OFF	Kings/Offaly
LEX	Laois/Laoighis	LEN	Leinster	LET	Leitrim	LEX	Leix/Queens
LIM	Limerick	LOG	Longford	LOU	Louth	MAY	Mayo
MEA	Meath	MOG	Monaghan	MUN	Munster	MEA	Navan
ROS	Roscommon	SLI	Sligo	TIP	Tipperary	UIE	Ulster
WAT	Waterford	WEM	Westmeath	WEX	Wexford	WIC	Wicklow

Italy

Note that these are informal abbreviations until I find the official ones (Rootsweb hasn't posted any official ones)!
AB	Abruzzo	BA	Bascilicata	CA	Campania	EM	Emilia-Romagna
FR	Fruili-Venezia Guilia	LA	Lazio	LI	Liguria	LO	Lombardia
MA	Marche	MO	Molise	PU	Pugilia	SA	Sardegna
SI	Sicilia	TO	Toscana	TR	Trentino-Alto Adige	UM	Umbria
VA	Valle D'Aosta	VE	Veneto

Northern Ireland

ARM	Antrim	LDY	Derry/Londonderry	DOW	Down	FER	Fermanagh
TYR	Tyrone	UGB	Ulster

Scotland

ABD	Aberdeenshire	ANS	Angus	ARL	Argyllshire	AYR	Ayshire
BAN	Banffshire	BEW	Berwickshire	BOR	Borders	BUT	Bute
CAI	Caithness	CEN	Central (Scotland)	CLK	Clackmannanshire	DFS	Dumfriesshire
DGY	Dumfries and Galloway	DNB	Dunbartonshire	ELN	East Lothian	FIF	Fifeshire
ANS	Forfarshire	GMP	Grampian	HLD	Highland	INV	Inverness-shire
KCD	Kincardineshire	KRS	Kinrossshire	KKD	Kirkcudbrightshire	LKS	Lanarkshire
LTN	Lothian	MLN	Midlothian	MOR	Moray	NAI	Nairnshire
OKI	Orkney Isles	PEE	Peebleshire	PER	Perthshire	RFW	Renfrewshire
ROC	Ross & Cromarty	ROX	Roxburghshire	SEL	Selkirkshire	SHI	Shetland Isles
STI	Stirlingshire	STD	Strathclyde	SUT	Sutherland	TAY	Tayside
WLN	West Lothian	WIS	Western Isles	WIG	Wigtownshire and Canadia

United States

AL	Alabama	AK	Alaska	AS	American Samoa	AZ	Arizona
AR	Arkansas	CA	California	CO	Colorado	CT	Connecticut
DE	Delaware	DC	District of Columbia	FM	Federated States of Micronesia	FL	Florida
GA	Georgia	GU	Guam	HI	Hawaii	ID	Idaho
IL	Illinois	IT	Indian Territory, Oklahoma	IN	Indiana	IA	Iowa
KS	Kansas	KY	Kentucky	LA	Louisiana	ME	Maine
MH	Marshall Islands	MD	Maryland	MA	Massachusetts	MI	Michigan
MN	Minnesota	MS	Mississippi	MO	Missouri	MT	Montana
NE	Nebraska	NV	Nevada	NH	New Hampshire	NJ	New Jersey
NM	New Mexico	NY	New York	NC	North Carolina	ND	North Dakota
MP	Northern Mariana Is.	OH	Ohio	OK	Oklahoma	OR	Oregon
PA	Pennsylvania	PR	Puerto Rico	RI	Rhode Island	SC	South Carolina
SD	South Dakota	TN	Tennessee	TX	Texas	UT	Utah
VT	Vermont	VI	Virgin Islands	VA	Virginia	WA	Washington
WV	West Virginia	WI	Wisconsin	WY	Wyoming