Switzerland
noun: Swiss (singular and plural)
adjective: Swiss
Syria
noun: Syrian(s)
adjective: Syrian
Taiwan
noun: Taiwan (singular and plural)
note: example: he or she is from Taiwan; they are from Taiwan
adjective: Taiwan
Tajikistan
noun: Tajikistani(s)
adjective: Tajikistani
Tanzania
noun: Tanzanian(s)
adjective: Tanzanian
Thailand
noun: Thai (singular and plural)
adjective: Thai
Togo
noun: Togolese (singular and plural)
adjective: Togolese
Tokelau
noun: Tokelauan(s)
adjective: Tokelauan
Tonga
noun: Tongan(s)
adjective: Tongan
Trinidad and Tobago
noun: Trinidadian(s), Tobagonian(s)
adjective: Trinidadian, Tobagonian