Sale price is the actual price a buyer pays for a particular property.
An appraisal is a detailed single property valuation, and may be obtained any time throughout the year. Appraisals can have a variety of purposes, e.g. mortgage loan, sale, home equity loan, and estate valuations. The County does not do individual appraisals of this type.
An assessment is a mass appraisal of all property within a locality as of January 1 of the reassessment year for tax purposes. Assessments are based on large numbers of sales that are analyzed to determine values for large groups of similar properties.