CREATE TABLE table_203_212 (id NUMBER, "#" NUMBER, "district" CLOB, "land area  ( km2 ) " NUMBER, "population\ ( 2010 census ) " NUMBER, "density  ( persons/km2 ) " NUMBER)

which other districts besides castries has a population that is more than 20,000 ?
SELECT "district" FROM table_203_212 WHERE "district" <> 'castries' AND "population\n(2010 census)" > 20000
SELECT "district" FROM "table_203_212" WHERE "district" <> 'castries' AND "population\n(2010 census)" > 20000