Certainly you can look to the tax records for the appraised value placed on your home but it should only be used as a reference not as a true value for sales purposes. Establish a market value before determining how to price your home for sale.
While appraised values are assigned for taxation purposes, actual market values are established by a licensed Appraiser. When you obtain a mortgage, the lender sends an appraiser to obtain a true value by visiting the property to check the condition and upgrades against similar homes sold in the area in the last 12 months.
There is almost always a discrepancy between the actual market value of a home and the tax appraised value because the tax assessor cannot perform in-person appraisals. Secondly, many homeowners leave appraisal increases undisputed which can create an overvaluation. Some homeowners protest these increases, or hire a company to do so, based upon the lowest sales in the area. This can create an undervaluation.
Ask your Realtor to help properly determine a listing price by providing the sales data not available to the general public. Or, you can hire an independent Appraisal of your property.