This is an old article, but Iowa just complied.

Also, they marked the states blue if they complied and red if they were sued for not complying. Strange choice.

  • Alabama
  • Iowa
  • Mississippi
  • Missouri
  • Montana
  • Nebraska
  • South Carolina
  • South Dakota
  • Texas
  • Tennessee
  • Utah
  • Virginia

The article is under a stricter paywall.

Iowa has turned over its voter registration data to the federal government, including sensitive information such as Social Security numbers of the state’s roughly 2 million active voters, according to Secretary of State Paul Pate.

Source