CREATE TABLE table_964 ("IN No." FLOAT, "County Name" TEXT, "Establishment Date  ( SW Indiana )   ( History )   ( Statehood ) " TEXT, "County Seat" TEXT, "Time Zone" TEXT, "Population  ( 2010 )   ( Rank ) " TEXT, "Area sq mi  ( km 2  )   ( Rank ) " TEXT, "Twps" FLOAT, "ZIP code Prefix ( es ) " TEXT, "% of Boundary by water" TEXT)

When the % of boundary by water is 63% what is the overall number of zip code prefix(es)?
SELECT COUNT("ZIP code Prefix(es)") FROM table_964 WHERE "% of Boundary by water" = '63%'
SELECT COUNT("ZIP code Prefix(es)") FROM "table_964" WHERE "% of Boundary by water" = '63%'