CREATE TABLE table_14253123_1 (zip_code_prefix_es_ VARCHAR(255), _percentage_of_boundary_by_water VARCHAR(255))
When the % of boundary by water is 63% what is the overall number of zip code prefix(es)?
    
SQL: SELECT COUNT(zip_code_prefix_es_) FROM table_14253123_1 WHERE _percentage_of_boundary_by_water = "63%"