Most county governments have a fixed levy for property tax mills. So if their target is $639 million then as tax appraisal values increase the tax per $1000 of

Most county governments have a fixed levy for property tax mills. So if their target is $639 million then as tax appraisal values increase the tax per $1000 of appraised value will fall so the total property tax collected is constant. Of course as more levies are approved by voters individual property tax bills will creep up that way.