Pittman, NV ... which like Topaz Lake has no zip code either ... but TCR lists "Pittman". Where do Pittman residents have their mail addressed?

I found other closer towns that use the the Gardnerville zip code, but are they really located in Gardnerville? Esamples; Mottsville, Centerville, Sheridan, Dresslerville. Topaz Lake is 21 miles from Gardnerville!