Table: indiana_counties
Columns: in_no
county_name
county_seat
time_zone
population_2010_rank
area_sq_mi_km_2_rank
twps
zip_code_prefix_es
of_boundary_by_water

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