I went through LD 5x09 "Fissure Quest" to try and count/estimate the amount of Kims on the Anaximander.

The most we see on screen together not including Lieutenant Kim is 8 Kims on the Beagle Bridge (6 First Contact Uniforms, 1 Voyager uniform, 1 Delta Flyer uniform):

In the scene immediately after the opening credit, we see two non-Lieutenant Kims with the Voyager uniform:

Combining the 8 Kims seen on the Beagle with the extra Voy Kim on the Anaximander, I estimate there to be at least 9 Kims (besides Lt).

However, there are some inconsistencies.

We only see 6 (non-Lieutenant) Kims in the prison, despite it being somewhat implied the Anaximander is mostly empty besides Garak and Bashir:

In one count the mess hall scene, I counted what was at least 6 and at most 11 Kims.

Overall, I'm sticking with my initial estimate of 9 for now.

I wonder what could account for variations in Kims. Were some actually locked up somewhere on the ship? Did Lieutenant Kim forget one?

Also, assuming there are 9-11 Kims, is 14-16 crew (adding Boimler, T'Pol, Curzon, Garak, and the LMH) enough to run a Defiant-class, which usually has compliment more in the 40s? It could be possible that since it's a Section 31 ship that it's outfitted to run with less agents.

P.S I find it a nice bit of canonical accuracy that most Kims are wearing First Contact uniforms (and likely made it home), as since most timelines are close to Prime, uniform designs shouldn't be that different.