SELECT DISTINCT city FROM branch WHERE membership_amount  >=  100
SELECT DISTINCT city FROM branch WHERE membership_amount  >=  100 <table_name> : branch col : Branch_ID | Name | Open_year | Address_road | City | membership_amount row 1 : 1 | Alexandre | 2001 | Valleys Place | London | 112 row 2 : 2 | Popert | 2009 | Oaks Crescent | London | 11 row 3 : 3 | Stanley | 2013 | Abbott Street | London | 6 row 4 : 4 | Zytogorski | 2009 | Abbey Rise | Oxford | 7 row 5 : 5 | Cochrane | 2012 | Brampton Road | London | 1418 row 6 : 6 | Taverner | 2014 | Cecilia Avenue | Oxford | 56 row 7 : 7 | Saint Amant | 2015 | Concord Road | London | 91 row 8 : 8 | Brooke Greville | 2009 | Glebe Street | Oxford | 31
col : City row 1 : London row 2 : Oxford