These are elected by either of two methods: (1) at large, when every
voter may vote for the entire number of commissioners; (2) they may be
elected from districts into which the county has been divided. In some
States the members of the county board are called _supervisors_, and
they represent the towns, villages, and wards of cities. Under this
system the county board is generally larger than under the commissioner
system. There is another difference between the two systems: in the
States that have county commissioners, the county government has a
larger number of functions than in the other States. That is, the county
government has almost entire control of such matters as roads and poor
relief, leaving the local governments with little authority in these
directions. On the other hand, where the supervisor system exists, the
towns and villages have chief authority in legislating upon these
matters, and the county assists or takes only such part as it finds
necessary for the general good.

Power of the Board.--The county board holds annual meetings and
makes laws for the county as a whole. It has charge of the county
property, including the court-house, jail, and poorhouse. Since it must
provide for the expense of maintaining these buildings, for the salaries
of county officers, and for other expenses connected with roads, poor,
and other county business, the board must also have the power of levying
taxes.

Superintendent of Schools.--Education is another function of
government which is not managed solely by the local units. There is a
county officer, called the _superintendent of schools_, who has
supervisory powers, and he usually examines teachers and certifies to
their qualifications.