Here is the list of embassies and consulates of 121 countries in New York and links to their official websites in the alphabetical order:
Afghanistan: http://www.embassyofafghanistan.org/page/visa-customs/
Albania: http://www.ambasadat.gov.al/usa/en/new-york-consulate
Algeria: http://www.algeria-cgny.org
Angola: https://www.angolaconsulateny.org
Antigua and Barbuda: https://www.abconsulate.nyc
Argentina: https://cnyor.cancilleria.gob.ar
Australia: https://usa.embassy.gov.au/new-york
Austria: https://www.bmeia.gv.at/en/austrian-consulate-general-new-york/
The Bahamas: http://www.bahamasembdc.org/contact/locations-consulate-information/
Barbados: https://www.passportsandvisas.com/embassy-consulate/barbados
Belarus: http://usa.mfa.gov.by/en/
Belgium: https://unitedstates.diplomatie.belgium.be/language_selection
Bélize: https://www.consulate-info.com/consulate/26956/Belize-in-New-York
Benin: https://www.consulate-info.com/consulate/26957/Benin-in-New-York
Bolivia: https://www.embassypages.com/bolivia-consulategeneral-newyork-unitedstates
Bulgaria: https://mfa.bg/embassies/usagc
Brazil: http://novayork.itamaraty.gov.br/en-us/
Cambodia: https://www.embassyofcambodiadc.org
Canada: https://www.international.gc.ca/country-pays/us-eu/new_york.aspx?lang=eng
Chile: https://chile.gob.cl/nueva-york/en/
China: http://newyork.china-consulate.org/eng/
Congo: https://www.un.int/drcongo/
Costa Rica: http://www.costarica-embassy.org/index.php?q=node/136
Cote d’Ivoire: https://www.consulatci-newyork.org/Site/
Colombia: http://nuevayork.consulado.gov.co
Croatia: https://www.consulate-info.com/consulate/3434/Croatia-in-New-York
Cuba: https://www.consulate-new-york.com/cuba.html
Cyprus: https://www.consulate-info.com/consulate/3480/Cyprus-in-New-York
Czech Republic: https://www.mzv.cz/ny
Denmark: https://usa.um.dk/en/about-us/danish-missions/consulate-general-of-denmark---new-york/
Dominican Republic: http://www.domrep.org/consulates_us.html
Ecuador: https://www.embassypages.com/ecuador-consulategeneral-newyork-unitedstates
Egypt: https://www.egypt-nyc.com
El Salvador: https://www.embassypages.com/elsalvador-consulategeneral-newyork-unitedstates
Equatorial Guinea: https://www.embassypages.com/equatorialguinea-permanentmission-newyork-unitednations
Estonia: https://newyork.mfa.ee
Ethiopia: https://www.embassypages.com/ethiopia-consulate-newyork-unitedstates
Finland: https://finlandabroad.fi/web/usa/frontpage
France: https://newyork.consulfrance.org
Gabon: https://www.embassypages.com/gabon-consulate-newyork-unitedstates
Gambia: https://www.consulate-info.com/consulate/31139/Gambia-in-New-York
Germany: https://www.germany.info/us-en/embassy-consulates/newyork
Georgia: http://www.newyork.mfa.gov.ge/default.aspx?sec_id=437&lang=1
Germany: https://www.germany.info/us-en/embassy-consulates/newyork
Ghana: http://www.ghanaconsulatenewyork.org
Greece: https://www.mfa.gr/usa/en/consulate-general-in-new-york
Grenada: https://grenadaembassyusa.org/relocation-of-government-of-grenada-offices-in-new-york/
Guatemala: https://www.consuladoguatemalanuevayork.org
Guyana: https://www.guyanaconsulatenewyork.org ( temporarily closed)
Haiti: https://www.haiti.org/consular-offices/
Honduras: https://www.embassypages.com/honduras-consulategeneral-newyork-unitedstates
Hungary: https://newyork.mfa.gov.hu/eng
Iceland: https://www.government.is/diplomatic-missions/consulate-general-of-iceland-in-new-york/
India: https://www.indiainnewyork.gov.in
Indonesia: https://kemlu.go.id/newyork/en
Iran: https://www.consulate-new-york.com/iran.html
Ireland: https://www.dfa.ie/irish-consulate/newyork/
Israel: https://embassies.gov.il/new-york/ConsularServices/Pages/consular-department.aspx
Italy: https://consnewyork.esteri.it/consolato_newyork/it/
Jamaica: https://congenjamaica-ny.org
Japan: https://www.ny.us.emb-japan.go.jp
Kazakhstan: https://kazconsulny.org
Kenya: https://kenyaembassydc.org
Korea: http://overseas.mofa.go.kr/us-newyork-ko/index.do
Kosovo: http://ambasada-ks.net/us/?page=2,9
Latvia: https://www.latvia-newyork.org/about-us/
Lebanon: http://nylebcons.org
Liberia: http://liberiaconsulate-ny.com
Liechtenstein: https://www.regierung.li/ministries/ministry-for-foreign-affairs/diplomatic-representations/new-york-usa/current-issues/
Lithuania: http://ny.mfa.lt
Luxembourg: https://newyork-cg.mae.lu/en/The-Luxembourg-House-in-New-York
Malaysia: https://www.kln.gov.my/web/usa_new-york/home
Malta: https://www.consulate-info.com/consulate/5903/Malta-in-New-York
Mexico: https://consulmex.sre.gob.mx/nuevayork/index.php/en/home
Moldova: https://sua.mfa.gov.md/en/content/honorary-consuls
Montenegro: https://www.embassypages.com/montenegro-consulategeneral-newyork-unitedstates
Morocco: http://www.moroccanconsulate.com
The Marshall Islands: https://www.un.int/marshallislands/
Nepal: https://nyc.nepalconsulate.gov.np
Netherlands: https://www.netherlandsworldwide.nl/countries/united-states/about-us/consulate-general-in-new-york
New Zealand: https://www.mfat.govt.nz/en/countries-and-regions/united-nations/permanent-mission-to-the-united-nations-new-york/
Nicaragua: https://www.embassypages.com/nicaragua-consulategeneral-newyork-unitedstates
Nigeria: http://www.nigeriahouse.com
Norway: https://www.norway.no/en/usa/norway-usa/new-york/
Pakistan: http://www.pakistanconsulateny.org
Panama: http://www.nyconsul.com
Paraguay: https://www.mre.gov.py/Sitios/Home/Contenido/consulpar-ny/311
Peru: http://www.consulado.pe/es/nuevayork/Paginas/Inicio.aspx
Philippines: https://newyorkpcg.org/pcgny/
Poland: https://www.gov.pl/web/usa-en/consulate-general-new-york
Portugal: https://novaiorque.consuladoportugal.mne.gov.pt/pt/
Qatar: https://ny.consulate.qa/en
Romania: http://newyork.mae.ro/en
Russian Federation: https://newyork.mid.ru
Saint Lucia: http://saintluciaconsulateny.org
Samoa: https://www.un.int/samoa/
Saudi Arabia: https://www.saudiembassy.net/saudi-offices
Serbia: http://www.newyork.mfa.gov.rs/lat/
Seychelles: https://www.embassypages.com/seychelles-consulategeneral-newyork-unitedstates
Singapore: https://www.mfa.gov.sg/Overseas-Mission/New-York-Consul/Consular-Services
Spain: http://www.exteriores.gob.es/Consulados/NUEVAYORK/en/Consulado/Pages/LocalizacionContacto.aspx
Somalia: https://www.embassypages.com/somalia-permanentmission-newyork-unitednations
South Africa: https://www.southafrica-newyork.net
Sudan: https://www.consulate-new-york.com/sudan.html
Sweden: https://www.swedenabroad.se/en/embassies/usa-new-york/
Switzerland: https://www.eda.admin.ch/newyork
Sri Lanka: https://www.embassypages.com/srilanka-consulategeneral-newyork-unitedstates
Tajikistan: https://www.embassypages.com/tajikistan-permanentmission-newyork-unitednations
Tanzania: https://www.consulate-new-york.com/tanzania.html
Thailand: https://www.thaicgny.com
Trinidad and Tobago: https://foreign.gov.tt/missions-consuls/tt-missions-abroad/diplomatic-missions/consulate-general-new-york-us/
Turkey: http://newyork.bk.mfa.gov.tr/Mission
Uganda: https://newyork.mofa.go.ug/data/smenu/19/Uganda-House.html?option=smenu&id=19
Ukraine: https://ny.mfa.gov.ua
United Arab Emirates: https://newyork.uae-embassy.org
United Kingdom: https://www.gov.uk/world/organisations/british-consulate-general-new-york
Uruguay: https://www.uruguaynewyork.org
Uzbekistan: https://www.embassypages.com/uzbekistan-consulategeneral-newyork-unitedstates
Venezuela: https://www.consulate-info.com/consulate/20473/Venezuela-in-New-York
Vietnam: https://www.vietnamconsulate-ny.org
Zimbabwe: https://www.consulate-new-york.com/zimbabwe.html