At the end of the war, the US had 27 aircraft carriers.
I know. We kicked tail.
By my informal count the US produced for WWII:
Light carriers, such as the USS San Jacinto (CVL-30) which participated in the Battle of the Philippine Sea, also included a young pilot named George Bush who was later shot down doing ground attacks over Chichijima.
Even smaller escort carriers were capable of combat, for example: providing air support for ground troops at Leyte Gulf.
An escort carrier task group also defeated a Japanese force of battle ships & cruisers off Samar.
Depending on how you count, other reports vary and this source says:
That would make 29 CVs & CVLs built, which would not seem to include the seven (or eight) already in service on December 7, 1941.