Well, even if they shouldn't ask, they probably will, small town employers generally want to know if you are married and/or have kids. Sometimes they even want to know if you have roommates.
They generally want to know these things so they can figure out how much they can get away with paying you. A married woman without kids would work at a place where her salary doesn't have to cover all of the expenses of the household. It is a subtle form of discrimination and part of the reason men get paid more for equal work, since a married man is assumed to support his wife at least partially.
If it comes up and you feel that saying "it's none of your business" would make you seem unfriendly just don't volunteer information. For example when work asked me if i were married I just said yes. I didn't mention names, gender, if we were together, separated,etc.
If you give really short answers devoid of content people know not to push, but don't feel put out as they would if you refused to talk to them.