In total, the collection holds 700 million records from 54 collections — 18 federal census collections and 36 state or country census collections. They date from 1790 to 1940.
To find out more about the collection and the value of census records, click the image, right.
Free access is now open at MyHeritage/research and will remain so until Sunday 12 April.
Update 5 April: End date was originally 5 April but MyHeritage decided to extend it so this blogpost has been amended.