Some Fulton County property owners will receive a second assessment notice, after errors were discovered in the first.

The problem affects about 300 homeowners, all of whom will receive a letter telling them to disregard their first notice. All notices posted online are correct.

VIDEO: Previous coverage on this issue

Fulton County could be forced to refund thousands of homeowners millions of property tax dollars after revelations their homes were illegally overvalued.

Jessica Corbitt, a spokesperson for the county, said the errors represent a tenth of a percent of all residential property owners. The errors had to do with sales data and neighborhood designations.

All property owners have until July 6 to appeal their values. The county has so far received 80 appeals.

Last year, residents complained about property values that rose higher than they expected. This year, values continued to increase.