CREATE TABLE table_204_863 (id NUMBER, "state" CLOB, "city/county" CLOB, "population served" NUMBER, "charter type" CLOB, "station name" CLOB, "web site" CLOB)

which has the least number of people served , black jack or jefferson city ?
SELECT "city/county" FROM table_204_863 WHERE "city/county" IN ('black jack', 'jefferson city') ORDER BY "population served" LIMIT 1
SELECT "city/county" FROM "table_204_863" WHERE "city/county" IN ('black jack', 'jefferson city') ORDER BY "population served" FETCH FIRST 1 ROWS ONLY