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