According to the Human Rights Campaign, 12 states and the District of Columbia prohibit discrimination based on sexual orientation and gender identity.
California (1992, 2003)
District of Columbia (1977, 2006)
New Jersey (1992, 2007)
New Mexico (2003)
Oregon (Jan. 2008)
Rhode Island (1995, 2001)
Vermont (1991, 2007)
In addition, state courts, commissions, agencies, or attorney general have interpreted the existing law to include some protection against discrimination against transgender individuals in Connecticut, Florida, Hawaii, Massachusetts and New York.
There are 20 states, plus the District of Columbia, that prohibit discrimination based on sexual orientation.
In addition to the same states above, they are: Connecticut (1991), Hawaii (1991), Maryland (2001), Massachusetts (1989), Nevada (1999), New Hampshire (1998), New York (2003), and Wisconsin (1982).
More information is available at the nonprofit organization's Web site.