Oregon Voluntary Acknowledgment of Parentage Affidavit (45-21)
Official state formParentage and paternityForm 45-21Free downloadLast verified November 10, 2026
Establishes legal parentage for a child who has no second parent on the Oregon birth record. Both parents sign before a notary and mail the original to the Center for Health Statistics. It can also change the child's last name.
Who can use this form
- The parent who gave birth and the alleged genetic parent, signing together before a notary
- Not for use if the birth parent was married at conception or birth, or within 300 days before the birth
- Not for use if a second parent is already listed on the birth record
What to send with it
- The original notarized affidavit
- The $35 filing fee, unless it is postmarked within 14 days of the child's birth
- A certified marriage record or the Oregon county of marriage, if Section 4 is used
- The office's web page also asks for the Amend a Birth Record Order Form (45-17A) and ID
Where to send it
- Mail to
- Center for Health Statistics PO Box 14050 Portland, OR 97293-0050
- State fee
- $35 filing fee. No fee if postmarked within 14 days from the child's date of birth.
- Typical processing
- Voluntary acknowledgment affidavits: 4 weeks, per the office's processing times page (updated 11/4/2026).
- Form revision
- 01/26
- Source
- Official government page