Depends what you mean by civilians… if you mean armed civilians, Minifigs and Peter Pig make clubmen.
If you mean unarmed civilians – QRF(Freikorps) make a good pack of camp followers which includes children, Peter Pig has a few packs (sprinkles pack has a sleeping drunk, plague doctors, and there is a farm pack), Matchlock have a 'characters' section which has a few useful figures (rat catcher, Witchfinder, various clergy, rich lady with a gun).
Transport: Essex make a gentleman's coach, Matchlock produce a mule litter.
You can see pictures of all these here
link
Stuff I don't own, but have an eye on:
Irregular make some generic peasants, a few of which might be suitable.
There's also a camp followers in Minifigs Hussite range, a few of the women might be suitable. Peter Pig pirate range is also worth a look as a few of the civilian packs in there may be of use.
