I really don't like license plates having the county on them. Knowing that someone is from a different county can encourage certain undesirable behaviors towards them. In states that use county codes as part of the plate number, this is unavoidable, but for states that write out the county, you should be able to leave it off. One of the reasons I have a specialty design on my vehicle is because it excludes the county (plus the extra money the design costs goes towards wildlife conservation).