Trying to dissecting a property tax bill

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I recently got my property tax bill for this year, and as usual, we have to pay the school district tax; state tax; county general; and the fire department tax. One item I see there though, it is county bond, which amounted to be over $10. I just wondering, if that is a county bond, is that mean I also holding a county bond year by year involuntarily? Would this item has a mature date which I will get my principal and the interest back over all these years I pay for it. I just didn't understand it completely, since it said "county bond". Isn't it "bond" mean the local government borrow money from us to build bridge; construct road; and agree to pay us back?