In 1998, the properties in the Harwinton Historic Districts were awarded placement on the National Register of Historic Places. Among the advantages are possible federal tax benefits for preservation and restoration and some protection against federally funded projects that might impact negatively on the property.

Any owner whose property is listed on the National Register of Historic Places is eligible to display a blue and gold aluminum plaque. The plaque is 4" x 7", is equipped with mounting holes and depicts the Charter Oak. Orders may be sent to the office of the Connecticut Commission of Culture and Tourism, 59 South Prospect Street, Hartford, Connecticut, 06106.

The owner must include the following:

1) The appropriate fee payable to: Treasurer - State of Connecticut
2) The property owner's name
3) The address of the property listed