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In one of the first season episodes, Kavanaugh made reference to the "200 or more members of the expedition, most of whom were scientists". So I'd go with that number. The number grew when they reconnected with earth and got more people.
Well in "Rising" we see 47 people (46 in the gate room plus McKay). In "The Gift" we are told that there are 200, most of which are scientists. But we're not sure that whether it includes the Athosians.
Presumably many more arrived after "The Siege, Part 3"
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