The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
(first | last) View (previous 50 | next 50) (20 | 50 | 100 | 250 | 500)- Cityballs of São Pauloball (3 members)
- Cityballs of Taiwanball (8 members)
- Cityballs of Tajikistanball (2 members)
- Cityballs of Tanzaniaball (3 members)
- Cityballs of Tennesseeball (2 members)
- Cityballs of Texasball (12 members)
- Cityballs of Thailandball (2 members)
- Cityballs of Tokelauball (1 member)
- Cityballs of Transnistriaball (1 member)
- Cityballs of Trinidad and Tobagoball (6 members)
- Cityballs of Tunisiaball (2 members)
- Cityballs of Turkeyball (16 members)
- Cityballs of Turkmenistanball (1 member)
- Cityballs of UKball (45 members)
- Cityballs of USAball (131 members)
- Cityballs of Ugandaball (1 member)
- Cityballs of Ukraineball (13 members)
- Cityballs of Utahball (1 member)
- Cityballs of Uzbekistanball (3 members)
- Cityballs of Vanuatuball (2 members)
- Cityballs of Venezuelaball (5 members)
- Cityballs of Vermontball (1 member)
- Cityballs of Vietnamball (6 members)
- Cityballs of Virginiaball (3 members)
- Cityballs of Walesball (4 members)
- Cityballs of Washingtonball (2 members)
- Cityballs of West Virginiaball (1 member)
- Cityballs of Western Saharaball (2 members)
- Cityballs of Wisconsinball (2 members)
- Cityballs of Wyomingball (1 member)
- Cityballs of Yemenball (3 members)
- Cityballs of Zambiaball (1 member)
- Cityballs of Zimbabweball (2 members)
- Citybricks (3 members)
- Citybricks of Kazakhbrick (6 members)
- Citycubes of Israelcube (7 members)
- Civil Wars (17 members)
- Cleanup (71 members)
- Client States (16 members)
- Coat of arms countryball (0 members)
- Cold War (11 members)
- Collapse templates (2 members)
- Colombiaball (78 members)
- Colombian (6 members)
- Colonyballs (331 members)
- Colonyballs of Austrian Empireball (6 members)
- Colonyballs of Belgian Empireball (1 member)
- Colonyballs of Belgiumball (3 members)
- Colonyballs of British Empireball (118 members)
- Colonyballs of Dutch Empireball (20 members)