Why do some places have just police, just sheriffs, or both?

I know how sheriffs and police officers differ in their duties. What I'm curious about is why some towns/counties have JUST police or JUST sheriffs, while others have both.

For example, the county I live in has both. When I went on vacation to Maine over the summer, the county had just sheriffs; any police officers worked for whatever town hired them. Why is that?

STEVEN F2018-10-20T23:26:14Z

In the US, EVERY county has a Sheriff and MOST towns have police. There is NO SUCH THING as a town/city Sheriff or county police.

odd2018-10-20T21:08:05Z

Sheriffs take care of outside of city limits (the county areas). Police are of whatever city is their jurisdiction.

Anonymous2018-10-20T21:02:38Z

The federated nature of the USA means that each state has a LOT of latitude in how it organises its internal affairs.

There's no more reason to expect Maine, California and Alaska to have the same policing structure as there is to expect Ireland, the UK and France to.

Tulip2018-10-20T21:01:01Z

It depends on how law enforcement is structured it differs from state to state

Anonymous2018-10-20T20:59:55Z

Depends on the town

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