CREATE TABLE "counties" (
  "in_no" real,
  "county_name" text,
  "county_seat" text,
  "time_zone" text,
  "population_2010_rank" text,
  "area_sq_mi_km_2_rank" text,
  "twps" real,
  "zip_code_prefix_es" text,
  "pct_of_boundary_by_water" text
);

Question: what is the zip code of boonville
SQL: SELECT "zip_code_prefix_es" FROM "counties" WHERE "county_seat"='boonville';