A contract requires consideration, I.e. value, for both parties in order to be valid. Key is - consideration is for you what you consider to he consideration. No one can tell you what consideration is for you. If you think paying property tax isn't consideration for you, you can send the county an affidavit saying so, and dissolve your contract.
Property tax is a contract. Any bills from government or any corporation stems from a contract. Contracts are based on consideration to be valid. You decide what consideration is for you. All government corporations can be found on Dunn & Bradstreet, even United States.
If the county sues you after you notified them of rescission and dissolution of your contract, you win easily because there is no valid contract. County requires a contract to extract money from you - it is voluntary - you agree to it.