How many crewmembers are usually in a Star Trek TV show on the enterprise or any other ship they use?

Answer 1

If you're referring to the fictional crew that serves aboard the ships, it depends on the class.

Enterprise NX-01 (Star Trek Enterprise [Archer]) held 83

USS Enterprise NCC-1701 (Star Trek [Kirk]) held 907 + their families

USS Enterprise NCC-1701-A (Star Trek [Kirk]) held 100 + room for 850 more

USS Enterprise NCC-1701-D (Star Trek TNG [Picard]) 1000-6000

USS Enterprise NCC-1701-E (Star Trek TNG [Picard]) 1000-6000

USS Enterprise NCC-1701 (Star Trek Movies [Kirk]) held 907

Terok Nor (Star Trek DSN [Sisko]) held 300 to 2,000 but room for 7,000

Voyager NCC-74656 (Star Trek Voyager [Janeway]) 200 crew members