Non-identifying information is information that may be obtained in most states from the agency or county that handled the adoption. Most agencies and counties require the request be made in writing.
The information that may be provided will vary from agency to agency, court to court, and from state to state. Non identifying information that is usually provided is:

Information in regards to Natural Parents:
Age of the natural parents at the time or birth or surrender
Place of Birth
Physical description of natural parents
Religion
Education
Hobbies
Family history and some information on the natural parents family
Reason for surrender

Information in regards to the adopters:
Ages of parents
Place of birth
Physical Description of parents
Length of marriage
Religion
Education
Hobbies
Composition of family-if there are other children
Reason for adoption

The information in the adoption file that pertains to the child is usually limited if a private adoption or if the child was placed at birth. If the family adopted another child, there may be some notes about the prior adoption ad the progress of the first child.

Non identifying information usually does not include names but there have been instances that first names have been provided. I have even experienced adoptees learning the dates of birth for their natural parents.

Non identifying information may be received in a narrative or outline format. Each agency and court has their own format.

Some agencies and courts charge a fee for this information. Adoptees should always request non identifying information when embarking on a search even if they have some data from when they were adopted. Many agencies and courts will provide more than what was given at the time of the adoption. I also suggest requesting non identifying information a second time if originally requested in the past and a lot of time has passed. If the post adoption worker who conducts searches for the agency and court changes, you should also request non identifying information again. The information you obtain the second time may be more than what you received the first time.