All 184 available Apple iTunes Country Stores as of March 3rd 2023. Please use the two-letter codes. Additional information is just for user convenience.

itunes_country_codes.json

[
	{"alpha_2":"AD","alpha_3":"AND","name":"Andorra"},
	{"alpha_2":"AE","alpha_3":"ARE","name":"United Arab Emirates"},
	{"alpha_2":"AF","alpha_3":"AFG","name":"Afghanistan"},
	{"alpha_2":"AG","alpha_3":"ATG","name":"Antigua and Barbuda"},
	{"alpha_2":"AI","alpha_3":"AIA","name":"Anguilla"},
	{"alpha_2":"AL","alpha_3":"ALB","name":"Albania"},
	{"alpha_2":"AM","alpha_3":"ARM","name":"Armenia"},
	{"alpha_2":"AO","alpha_3":"AGO","name":"Angola"},
	{"alpha_2":"AR","alpha_3":"ARG","name":"Argentina"},
	{"alpha_2":"AT","alpha_3":"AUT","name":"Austria"},
	{"alpha_2":"AU","alpha_3":"AUS","name":"Australia"},
	{"alpha_2":"AZ","alpha_3":"AZE","name":"Azerbaijan"},
	{"alpha_2":"BA","alpha_3":"BIH","name":"Bosnia and Herzegovina"},
	{"alpha_2":"BB","alpha_3":"BRB","name":"Barbados"},
	{"alpha_2":"BD","alpha_3":"BGD","name":"Bangladesh"},
	{"alpha_2":"BE","alpha_3":"BEL","name":"Belgium"},
	{"alpha_2":"BF","alpha_3":"BFA","name":"Burkina Faso"},
	{"alpha_2":"BG","alpha_3":"BGR","name":"Bulgaria"},
	{"alpha_2":"BH","alpha_3":"BHR","name":"Bahrain"},
	{"alpha_2":"BJ","alpha_3":"BEN","name":"Benin"},
	{"alpha_2":"BM","alpha_3":"BMU","name":"Bermuda"},
	{"alpha_2":"BN","alpha_3":"BRN","name":"Brunei Darussalam"},
	{"alpha_2":"BO","alpha_3":"BOL","name":"Bolivia, Plurinational State of"},
	{"alpha_2":"BR","alpha_3":"BRA","name":"Brazil"},
	{"alpha_2":"BS","alpha_3":"BHS","name":"Bahamas"},
	{"alpha_2":"BT","alpha_3":"BTN","name":"Bhutan"},
	{"alpha_2":"BW","alpha_3":"BWA","name":"Botswana"},
	{"alpha_2":"BY","alpha_3":"BLR","name":"Belarus"},
	{"alpha_2":"BZ","alpha_3":"BLZ","name":"Belize"},
	{"alpha_2":"CA","alpha_3":"CAN","name":"Canada"},
	{"alpha_2":"CD","alpha_3":"COD","name":"Congo, The Democratic Republic of the"},
	{"alpha_2":"CF","alpha_3":"CAF","name":"Central African Republic (the)"},
	{"alpha_2":"CG","alpha_3":"COG","name":"Congo"},
	{"alpha_2":"CH","alpha_3":"CHE","name":"Switzerland"},
	{"alpha_2":"CI","alpha_3":"CIV","name":"Côte d'Ivoire"},
	{"alpha_2":"CL","alpha_3":"CHL","name":"Chile"},
	{"alpha_2":"CM","alpha_3":"CMR","name":"Cameroon"},
	{"alpha_2":"CN","alpha_3":"CHN","name":"China"},
	{"alpha_2":"CO","alpha_3":"COL","name":"Colombia"},
	{"alpha_2":"CR","alpha_3":"CRI","name":"Costa Rica"},
	{"alpha_2":"CV","alpha_3":"CPV","name":"Cabo Verde"},
	{"alpha_2":"CY","alpha_3":"CYP","name":"Cyprus"},
	{"alpha_2":"CZ","alpha_3":"CZE","name":"Czechia"},
	{"alpha_2":"DE","alpha_3":"DEU","name":"Germany"},
	{"alpha_2":"DK","alpha_3":"DNK","name":"Denmark"},
	{"alpha_2":"DM","alpha_3":"DMA","name":"Dominica"},
	{"alpha_2":"DO","alpha_3":"DOM","name":"Dominican Republic"},
	{"alpha_2":"DZ","alpha_3":"DZA","name":"Algeria"},
	{"alpha_2":"EC","alpha_3":"ECU","name":"Ecuador"},
	{"alpha_2":"EE","alpha_3":"EST","name":"Estonia"},
	{"alpha_2":"EG","alpha_3":"EGY","name":"Egypt"},
	{"alpha_2":"ES","alpha_3":"ESP","name":"Spain"},
	{"alpha_2":"ET","alpha_3":"ETH","name":"Ethiopia"},
	{"alpha_2":"FI","alpha_3":"FIN","name":"Finland"},
	{"alpha_2":"FJ","alpha_3":"FJI","name":"Fiji"},
	{"alpha_2":"FM","alpha_3":"FSM","name":"Micronesia, Federated States of"},
	{"alpha_2":"FR","alpha_3":"FRA","name":"France"},
	{"alpha_2":"GA","alpha_3":"GAB","name":"Gabon"},
	{"alpha_2":"GB","alpha_3":"GBR","name":"United Kingdom"},
	{"alpha_2":"GD","alpha_3":"GRD","name":"Grenada"},
	{"alpha_2":"GE","alpha_3":"GEO","name":"Georgia"},
	{"alpha_2":"GH","alpha_3":"GHA","name":"Ghana"},
	{"alpha_2":"GM","alpha_3":"GMB","name":"Gambia"},
	{"alpha_2":"GN","alpha_3":"GIN","name":"Guinea"},
	{"alpha_2":"GR","alpha_3":"GRC","name":"Greece"},
	{"alpha_2":"GT","alpha_3":"GTM","name":"Guatemala"},
	{"alpha_2":"GW","alpha_3":"GNB","name":"Guinea-Bissau"},
	{"alpha_2":"GY","alpha_3":"GUY","name":"Guyana"},
	{"alpha_2":"HK","alpha_3":"HKG","name":"Hong Kong"},
	{"alpha_2":"HN","alpha_3":"HND","name":"Honduras"},
	{"alpha_2":"HR","alpha_3":"HRV","name":"Croatia"},
	{"alpha_2":"HU","alpha_3":"HUN","name":"Hungary"},
	{"alpha_2":"ID","alpha_3":"IDN","name":"Indonesia"},
	{"alpha_2":"IE","alpha_3":"IRL","name":"Ireland"},
	{"alpha_2":"IL","alpha_3":"ISR","name":"Israel"},
	{"alpha_2":"IN","alpha_3":"IND","name":"India"},
	{"alpha_2":"IQ","alpha_3":"IRQ","name":"Iraq"},
	{"alpha_2":"IS","alpha_3":"ISL","name":"Iceland"},
	{"alpha_2":"IT","alpha_3":"ITA","name":"Italy"},
	{"alpha_2":"JM","alpha_3":"JAM","name":"Jamaica"},
	{"alpha_2":"JO","alpha_3":"JOR","name":"Jordan"},
	{"alpha_2":"JP","alpha_3":"JPN","name":"Japan"},
	{"alpha_2":"KE","alpha_3":"KEN","name":"Kenya"},
	{"alpha_2":"KG","alpha_3":"KGZ","name":"Kyrgyzstan"},
	{"alpha_2":"KH","alpha_3":"KHM","name":"Cambodia"},
	{"alpha_2":"KN","alpha_3":"KNA","name":"Saint Kitts and Nevis"},
	{"alpha_2":"KR","alpha_3":"KOR","name":"Korea, Republic of"},
	{"alpha_2":"KW","alpha_3":"KWT","name":"Kuwait"},
	{"alpha_2":"KY","alpha_3":"CYM","name":"Cayman Islands"},
	{"alpha_2":"KZ","alpha_3":"KAZ","name":"Kazakhstan"},
	{"alpha_2":"LA","alpha_3":"LAO","name":"Lao People's Democratic Republic"},
	{"alpha_2":"LB","alpha_3":"LBN","name":"Lebanon"},
	{"alpha_2":"LC","alpha_3":"LCA","name":"Saint Lucia"},
	{"alpha_2":"LI","alpha_3":"LIE","name":"Liechtenstein"},
	{"alpha_2":"LK","alpha_3":"LKA","name":"Sri Lanka"},
	{"alpha_2":"LR","alpha_3":"LBR","name":"Liberia"},
	{"alpha_2":"LT","alpha_3":"LTU","name":"Lithuania"},
	{"alpha_2":"LU","alpha_3":"LUX","name":"Luxembourg"},
	{"alpha_2":"LV","alpha_3":"LVA","name":"Latvia"},
	{"alpha_2":"LY","alpha_3":"LBY","name":"Libya"},
	{"alpha_2":"MA","alpha_3":"MAR","name":"Morocco"},
	{"alpha_2":"MC","alpha_3":"MCO","name":"Monaco"},
	{"alpha_2":"MD","alpha_3":"MDA","name":"Moldova, Republic of"},
	{"alpha_2":"ME","alpha_3":"MNE","name":"Montenegro"},
	{"alpha_2":"MG","alpha_3":"MDG","name":"Madagascar"},
	{"alpha_2":"MK","alpha_3":"MKD","name":"North Macedonia"},
	{"alpha_2":"ML","alpha_3":"MLI","name":"Mali"},
	{"alpha_2":"MM","alpha_3":"MMR","name":"Myanmar"},
	{"alpha_2":"MN","alpha_3":"MNG","name":"Mongolia"},
	{"alpha_2":"MO","alpha_3":"MAC","name":"Macao"},
	{"alpha_2":"MR","alpha_3":"MRT","name":"Mauritania"},
	{"alpha_2":"MS","alpha_3":"MSR","name":"Montserrat"},
	{"alpha_2":"MT","alpha_3":"MLT","name":"Malta"},
	{"alpha_2":"MU","alpha_3":"MUS","name":"Mauritius"},
	{"alpha_2":"MV","alpha_3":"MDV","name":"Maldives"},
	{"alpha_2":"MW","alpha_3":"MWI","name":"Malawi"},
	{"alpha_2":"MX","alpha_3":"MEX","name":"Mexico"},
	{"alpha_2":"MY","alpha_3":"MYS","name":"Malaysia"},
	{"alpha_2":"MZ","alpha_3":"MOZ","name":"Mozambique"},
	{"alpha_2":"NA","alpha_3":"NAM","name":"Namibia"},
	{"alpha_2":"NE","alpha_3":"NER","name":"Niger"},
	{"alpha_2":"NG","alpha_3":"NGA","name":"Nigeria"},
	{"alpha_2":"NI","alpha_3":"NIC","name":"Nicaragua"},
	{"alpha_2":"NL","alpha_3":"NLD","name":"Netherlands"},
	{"alpha_2":"NO","alpha_3":"NOR","name":"Norway"},
	{"alpha_2":"NP","alpha_3":"NPL","name":"Nepal"},
	{"alpha_2":"NR","alpha_3":"NRU","name":"Nauru"},
	{"alpha_2":"NZ","alpha_3":"NZL","name":"New Zealand"},
	{"alpha_2":"OM","alpha_3":"OMN","name":"Oman"},
	{"alpha_2":"PA","alpha_3":"PAN","name":"Panama"},
	{"alpha_2":"PE","alpha_3":"PER","name":"Peru"},
	{"alpha_2":"PG","alpha_3":"PNG","name":"Papua New Guinea"},
	{"alpha_2":"PH","alpha_3":"PHL","name":"Philippines"},
	{"alpha_2":"PK","alpha_3":"PAK","name":"Pakistan"},
	{"alpha_2":"PL","alpha_3":"POL","name":"Poland"},
	{"alpha_2":"PS","alpha_3":"PSE","name":"Palestine, State of"},
	{"alpha_2":"PT","alpha_3":"PRT","name":"Portugal"},
	{"alpha_2":"PW","alpha_3":"PLW","name":"Palau"},
	{"alpha_2":"PY","alpha_3":"PRY","name":"Paraguay"},
	{"alpha_2":"QA","alpha_3":"QAT","name":"Qatar"},
	{"alpha_2":"RO","alpha_3":"ROU","name":"Romania"},
	{"alpha_2":"RS","alpha_3":"SRB","name":"Serbia"},
	{"alpha_2":"RU","alpha_3":"RUS","name":"Russian Federation"},
	{"alpha_2":"RW","alpha_3":"RWA","name":"Rwanda"},
	{"alpha_2":"SA","alpha_3":"SAU","name":"Saudi Arabia"},
	{"alpha_2":"SB","alpha_3":"SLB","name":"Solomon Islands"},
	{"alpha_2":"SC","alpha_3":"SYC","name":"Seychelles"},
	{"alpha_2":"SE","alpha_3":"SWE","name":"Sweden"},
	{"alpha_2":"SG","alpha_3":"SGP","name":"Singapore"},
	{"alpha_2":"SI","alpha_3":"SVN","name":"Slovenia"},
	{"alpha_2":"SK","alpha_3":"SVK","name":"Slovakia"},
	{"alpha_2":"SL","alpha_3":"SLE","name":"Sierra Leone"},
	{"alpha_2":"SN","alpha_3":"SEN","name":"Senegal"},
	{"alpha_2":"SR","alpha_3":"SUR","name":"Suriname"},
	{"alpha_2":"ST","alpha_3":"STP","name":"Sao Tome and Principe"},
	{"alpha_2":"SV","alpha_3":"SLV","name":"El Salvador"},
	{"alpha_2":"SZ","alpha_3":"SWZ","name":"Eswatini"},
	{"alpha_2":"TC","alpha_3":"TCA","name":"Turks and Caicos Islands"},
	{"alpha_2":"TD","alpha_3":"TCD","name":"Chad"},
	{"alpha_2":"TH","alpha_3":"THA","name":"Thailand"},
	{"alpha_2":"TJ","alpha_3":"TJK","name":"Tajikistan"},
	{"alpha_2":"TM","alpha_3":"TKM","name":"Turkmenistan"},
	{"alpha_2":"TN","alpha_3":"TUN","name":"Tunisia"},
	{"alpha_2":"TO","alpha_3":"TON","name":"Tonga"},
	{"alpha_2":"TR","alpha_3":"TUR","name":"Turkey"},
	{"alpha_2":"TT","alpha_3":"TTO","name":"Trinidad and Tobago"},
	{"alpha_2":"TW","alpha_3":"TWN","name":"Taiwan, Province of China"},
	{"alpha_2":"TZ","alpha_3":"TZA","name":"Tanzania, United Republic of"},
	{"alpha_2":"UA","alpha_3":"UKR","name":"Ukraine"},
	{"alpha_2":"UG","alpha_3":"UGA","name":"Uganda"},
	{"alpha_2":"US","alpha_3":"USA","name":"United States"},
	{"alpha_2":"UY","alpha_3":"URY","name":"Uruguay"},
	{"alpha_2":"UZ","alpha_3":"UZB","name":"Uzbekistan"},
	{"alpha_2":"VC","alpha_3":"VCT","name":"Saint Vincent and the Grenadines"},
	{"alpha_2":"VE","alpha_3":"VEN","name":"Venezuela, Bolivarian Republic of"},
	{"alpha_2":"VG","alpha_3":"VGB","name":"Virgin Islands, British"},
	{"alpha_2":"VN","alpha_3":"VNM","name":"Viet Nam"},
	{"alpha_2":"VU","alpha_3":"VUT","name":"Vanuatu"},
	{"alpha_2":"WS","alpha_3":"WSM","name":"Samoa"},
	{"alpha_2":"XK","alpha_3":"XXK","name":"Kosovo"},
	{"alpha_2":"YE","alpha_3":"YEM","name":"Yemen"},
	{"alpha_2":"ZA","alpha_3":"ZAF","name":"South Africa"},
	{"alpha_2":"ZM","alpha_3":"ZMB","name":"Zambia"},
	{"alpha_2":"ZW","alpha_3":"ZWE","name":"Zimbabwe"}
]

@jcoester Hey, a suggestion that might save you time and keep the list up-to-date:
Since you mentioned here that you're using a script to generate this list, you could move this to a repo with an automated GitHub Action that runs once a day / a week / whatever time period you prefer, which will run the script and automatically update the list with the results.

I wouldn't mind helping if you need help with that.

Permanently updated iTunes Country codes: https://github.com/jcoester/iTunes-country-codes.
184 supported countries as of March 6, 2023

Thank you @MichaelYochpaz for the great idea!