These are links to give you information on how to marry in the countries listed below, each country has different regulations. Below are links for marriage instructions in other countries:
A – H
Afghanistan http://kabul.usembassy.gov/mar.html
Albania http://tirana.usembassy.gov/marriage.html
Armenia http://armenia.usembassy.gov/marriage.html
Austria http://austria.usembassy.gov/marr-div.html#marriage
Azerbaijan http://azerbaijan.usembassy.gov/marriage.html
Belarus http://minsk.usembassy.gov/marriage.html
Belgium http://belgium.usembassy.gov/marriage-in-belgium.html
Belize http://belize.usembassy.gov/information_for_travelers/marrying-in-belize.html
Bosnia & Herzegovina http://sarajevo.usembassy.gov/marriage.html
Brazil http://brazil.usembassy.gov/marriage-info.html
Bulgaria http://bulgaria.usembassy.gov/married5.html
Cambodia http://cambodia.usembassy.gov/getting_married_in_cambodia.html
China http://chengdu.usembassy-china.org.cn/marriage_in_china2.html
Colombia http://bogota.usembassy.gov/marriage.html
Costa Rica http://www.worldheadquarters.com/cr/weddings/
Cuba http://havana.usint.gov/marriageprocess.html
Cyprus http://cyprus.usembassy.gov/uscitizen/marrage.html
Czech Republic http://prague.usembassy.gov/getting_married_in_the_czech_republic.html
Denmark http://denmark.usembassy.gov/getting–maried.html
Dominican Republic http://santodomingo.usembassy.gov/marriage_dr-e.html
Ecuador http://ecuador.usembassy.gov/service/living-in-ecuador/marriage-information.html
Egypt http://egypt.usembassy.gov/consular/acs12.html
El Salvador http://sansalvador.usembassy.gov/marriages.html
Estonia http://estonia.usembassy.gov/marriage_est.html
Finland http://finland.usembassy.gov/marriage.html
Germany http://germany.usembassy.gov/acs/getting_married/
Greece http://athens.usembassy.gov/marriage.html
Guatemala http://guatemala.usembassy.gov/acs_marriage_guatemala.html
Guinea http://conakry.usembassy.gov/marriage2.html
Haiti http://haiti.usembassy.gov/service/useful-information/marriage–divorce-in-haiti.html
Holy See: Getting married in the Vatican http://vatican.usembassy.gov/vatican/married.html
Hong Kong http://hongkong.usconsulate.gov/acs_marriage.html
Hungary http://hungary.usembassy.gov/marriage.html
I – N
India http://chennai.usconsulate.gov/marriageinindia.html
Indonesia http://jakarta.usembassy.gov/us-service/marriage.html
Iraq http://iraq.usembassy.gov/consular/us/birthadoptionmarriage/marriage.html
Israel http://israel.usembassy.gov/consular/acs/marriage.html
Italy http://italy.usembassy.gov/marriage-info.html
Jamaica http://kingston.usembassy.gov/family_issues2.html
Japan http://japan.usembassy.gov/e/acs/tacs-7114.html
Jordan http://jordan.usembassy.gov/acs_marriage_jordan.html
Kazakhstan http://kazakhstan.usembassy.gov/married.html
Kenya http://nairobi.usembassy.gov/marriage_in_kenya.html
Korea http://seoul.usembassy.gov/acs_getting_married.html
Kosovo http://pristina.usembassy.gov/kosinfo_5.html
Kuwait http://kuwait.usembassy.gov/civil_marriage_information.html
Kyrgyz http://bishkek.usembassy.gov/marriage.html
Laos http://laos.usembassy.gov/marriage_in_laos.html
Latvia http://riga.usembassy.gov/marryinlatvia.html
Lebanon http://lebanon.usembassy.gov/marriage.html
Lithuania http://vilnius.usembassy.gov/marriage.html
Luxemburg http://luxembourg.usembassy.gov/marriage.html
Macedonia http://macedonia.usembassy.gov/getting_married.html
Malaysia http://malaysia.usembassy.gov/marriage.html
Mexico http://monterrey.usconsulate.gov/marriage_in_mexico.html
Moldova http://moldova.usembassy.gov/marriages.html
Mongolia http://mongolia.usembassy.gov/getting_married.html
Montenegro http://podgorica.usembassy.gov/marriage_in_montenegro.html
Morocco http://morocco.usembassy.gov/service/professional-services/marriage-information.html
Netherlands http://amsterdam.usconsulate.gov/getting_married2.html
Nicaragua http://nicaragua.usembassy.gov/marriage_in_nicaragua.html
Niger http://niamey.usembassy.gov/marriageinniger.html
O – Z
Panama http://panama.usembassy.gov/marriage_in_panama2.html
Paraguay http://paraguay.usembassy.gov/citizen_information/marriage-in-paraguay.html
Peru http://lima.usembassy.gov/residentinfo/marriage-in-peru.html
Philippines http://manila.usembassy.gov/marriage.html
Poland http://poland.usembassy.gov/poland/marriage_poland.html
Portugal http://azores.usconsulate.gov/marriage-info.html
Qatar http://qatar.usembassy.gov/citizen-services/marriage-in-qatar.html
Romania http://romania.usembassy.gov/acs/marriages.html
Russia http://vladivostok.usconsulate.gov/acsmarryrus.html
Serbia http://serbia.usembassy.gov/marriage.html
Singapore http://singapore.usembassy.gov/marriage-in-singapore.html
Slovenia http://slovenia.usembassy.gov/getting_married.html
Spain http://madrid.usembassy.gov/citizen-services/professional-services/non-emergency-services.html
Sri Lanka & Maldives http://srilanka.usembassy.gov/service/marriage-in-sri-lanka3.html
Sudan http://sudan.usembassy.gov/getting_married.html
Switzerland http://bern.usembassy.gov/marriage_in_switzerland.html
Tajikistan http://dushanbe.usembassy.gov/marriage.html
Thailand http://bangkok.usembassy.gov/service/marriage.html
Togo http://togo.usembassy.gov/marriage.html
Trinidad & Tobago http://trinidad.usembassy.gov/getting_married_in_tt.html
Tunisia http://tunisia.usembassy.gov/marriage-tunisia.html
Turkey http://turkey.usembassy.gov/marriage_divorce.html
Turkmenistan http://turkmenistan.usembassy.gov/marriage.html
Ukraine http://ukraine.usembassy.gov/ukrainian-issues.html
Dubai http://dubai.usconsulate.gov/dubai_marriage.html
United Kingdom http://london.usembassy.gov/cons_new/acs/scs/marriage_and_civil_partners.html
Uzbekistan http://uzbekistan.usembassy.gov/marriage_registration4.html
Vietnam http://hochiminh.usconsulate.gov/marriage_in_vietnam.html
Zimbabwe http://harare.usembassy.gov/marriage_zimbabwe2.html