List of Storefront IDs (http://www.apple.com/itunes/affiliates/resources/documentation/linking-to-the-itunes-music-store.html#appendix) is not complete. Here's the full list of all 155 countries (2014-02-11) along with ids. Everything wrapped in tasty python dictionary. List produced with API from https://appfigures.com.

storefronts.py

appStores = {
    "Albania": 143575,
    "Algeria": 143563,
    "Angola": 143564,
    "Anguilla": 143538,
    "Antigua And Barbuda": 143540,
    "Argentina": 143505,
    "Armenia": 143524,
    "Australia": 143460,
    "Austria": 143445,
    "Azerbaijan": 143568,
    "Bahamas": 143539,
    "Bahrain": 143559,
    "Barbados": 143541,
    "Belarus": 143565,
    "Belgium": 143446,
    "Belize": 143555,
    "Benin": 143576,
    "Bermuda": 143542,
    "Bhutan": 143577,
    "Bolivia": 143556,
    "Botswana": 143525,
    "Brazil": 143503,
    "British Virgin Islands": 143543,
    "Brunei Darussalam": 143560,
    "Bulgaria": 143526,
    "Burkina Faso": 143578,
    "Cambodia": 143579,
    "Canada": 143455,
    "Cape Verde": 143580,
    "Cayman Islands": 143544,
    "Chad": 143581,
    "Chile": 143483,
    "China": 143465,
    "Colombia": 143501,
    "Congo": 143582,
    "Costa Rica": 143495,
    "Croatia": 143494,
    "Cyprus": 143557,
    "Czech Republic": 143489,
    "Denmark": 143458,
    "Dominica": 143545,
    "Dominican Republic": 143508,
    "Ecuador": 143509,
    "Egypt": 143516,
    "El Salvador": 143506,
    "Estonia": 143518,
    "Fiji": 143583,
    "Finland": 143447,
    "France": 143442,
    "Gambia": 143584,
    "Germany": 143443,
    "Ghana": 143573,
    "Greece": 143448,
    "Grenada": 143546,
    "Guatemala": 143504,
    "Guinea-bissau": 143585,
    "Guyana": 143553,
    "Honduras": 143510,
    "Hong Kong": 143463,
    "Hungary": 143482,
    "Iceland": 143558,
    "India": 143467,
    "Indonesia": 143476,
    "Ireland": 143449,
    "Israel": 143491,
    "Italy": 143450,
    "Jamaica": 143511,
    "Japan": 143462,
    "Jordan": 143528,
    "Kazakhstan": 143517,
    "Kenya": 143529,
    "Kuwait": 143493,
    "Kyrgyzstan": 143586,
    "Lao Peoples Democratic Republic": 143587,
    "Latvia": 143519,
    "Lebanon": 143497,
    "Liberia": 143588,
    "Lithuania": 143520,
    "Luxembourg": 143451,
    "Macao": 143515,
    "Macedonia": 143530,
    "Madagascar": 143531,
    "Malawi": 143589,
    "Malaysia": 143473,
    "Mali": 143532,
    "Malta": 143521,
    "Mauritania": 143590,
    "Mauritius": 143533,
    "Mexico": 143468,
    "Micronesia": 143591,
    "Moldova": 143523,
    "Mongolia": 143592,
    "Montserrat": 143547,
    "Mozambique": 143593,
    "Namibia": 143594,
    "Nepal": 143484,
    "Netherlands": 143452,
    "New Zealand": 143461,
    "Nicaragua": 143512,
    "Niger": 143534,
    "Nigeria": 143561,
    "Norway": 143457,
    "Oman": 143562,
    "Pakistan": 143477,
    "Palau": 143595,
    "Panama": 143485,
    "Papua New Guinea": 143597,
    "Paraguay": 143513,
    "Peru": 143507,
    "Philippines": 143474,
    "Poland": 143478,
    "Portugal": 143453,
    "Qatar": 143498,
    "Romania": 143487,
    "Russia": 143469,
    "Sao Tome & Principe": 143598,
    "Saudi Arabia": 143479,
    "Senegal": 143535,
    "Seychelles": 143599,
    "Sierra Leone": 143600,
    "Singapore": 143464,
    "Slovakia": 143496,
    "Slovenia": 143499,
    "Solomon Islands": 143601,
    "South Africa": 143472,
    "South Korea": 143466,
    "Spain": 143454,
    "Sri Lanka": 143486,
    "St. Kitts and Nevis": 143548,
    "St. Lucia": 143549,
    "St. Vincent & The Grenadines": 143550,
    "Suriname": 143554,
    "Swaziland": 143602,
    "Sweden": 143456,
    "Switzerland": 143459,
    "Taiwan": 143470,
    "Tajikistan": 143603,
    "Tanzania": 143572,
    "Thailand": 143475,
    "Trinidad and Tobago": 143551,
    "Tunisia": 143536,
    "Turkey": 143480,
    "Turkmenistan": 143604,
    "Turks and Caicos": 143552,
    "UAE": 143481,
    "Uganda": 143537,
    "Ukraine": 143492,
    "United Kingdom": 143444,
    "United States": 143441,
    "Uruguay": 143514,
    "Uzbekistan": 143566,
    "Venezuela": 143502,
    "Vietnam": 143471,
    "Yemen": 143571,
    "Zimbabwe": 143605
}

I merged it with my list, you were missing a few items. https://gist.github.com/teebu/3422f921644118dc6887