What should I do if I don't think the assessed value given to my property is accurate?

Call your township assessor to talk over the matter with him or her.  Your assessor's phone number is displayed on the front of your tax bill, at the bottom of the box titled "Formula for Tax Calculation," on the left hand side of the bill.  A list of the names and phone numbers of the township assessors can be viewed online here. Your assessor's phone number is also located in the pink box of your Assessment Change notice.