Thanks. The list at the link shown in dated to February 2013, so there have been a number of other women depicted on stamps since then, most recently Maya Angelou.
Although it's quite dated today, in 2003 the US Postal Service actually issued a brochure (Publication 512) entitled "Women on Stamps" with images of many of the stamps referenced:
https://about.usps.com/publications/pub512.pdfIn 2008, the APS actually published a "free" stamp album covering the subject "Women on U.S. Stamps" for the 50 year period 1958-2008, intended as an attempt to bring young girls into the stamp collecting hobby:
http://stamps.org/userfiles/file/albums/Women2.pdf