The bill has support from Attorney General Bob Ferguson.
The march, which is timed to the anniversary of Roe v Wade, took place as legislators considered bills that would broaden access to abortion services.
The hearing attracted passionate testimony from both sides of the issue.
One Senate bill would prohibit internet service providers from exercising “deceptive” tactics and impairing or blocking legal web content.
Democratic lawmakers are hopeful that this is the year for the Reproductive Parity Act.
