The best way to acquire unarmed civilians is to get armed civilians and cut off their weapons.
The Perry Brothers make a wonderful line of generic civilians
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Redoubt Boxer civilians offer much conversion potential.
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I have used Redoubt civil war artillery as civilians (see spare heads for variety)
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Many Dixon ACW figures lend themselves to civilians, down load the catalog to see figures with easily removable weapons and artillery tools
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WW2 Civilians
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Old West
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Artizan Thrilling Tales is packed with civilian figures, or armed types that just need a snip here or there, change a head and there you go
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I mostly look for civilian figures in order to arm them for militia.
I just found this new range from Artisan. Lots of good convertible civilians, either way.
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Pulp Figures is a vast mine of civilians
pulpfigures.com/products
Also check out "gangster" ranges.
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Most of the women in this picture were unarmed, and I added weapons. Redoubt, Artizan, Brigade,
Here is my collection of armed and unarmed civilian pairs.
Both of above painted by Fernando
Here is a cleric (right), father Sweeny from Thrilling Tales, with crucifix
removed :) You could just leave hand empty
Also, check out various ranges of Boers. Often horse holders or figs on guard can be converted. Too bad most have bandoliers.
This should get you started, with the other suggestions. There are many civilians out there.