Pay property taxes on time. Property Tax Statements are mailed out in October, and are due upon receipt.The mission of the Collin Central Appraisal District is to appraise all property in the Collin County Appraisal District at market value equally and uniformly. At the death of the donor, Collin. College Foundation may use the property or sell it for cash. To apply for an exemption, call the Collin County Appraisal District at (469) 742-9200 or Denton County Appraisal District at (940) 349-3800. For more information on the applicable tax rates for Trinity Falls subdivision, please refer to the Collin County Appraisal District tax rates page. Official website of the National Institutes of Health (NIH). NIH is one of the world's foremost medical research centers. Filled for at least one year.