In 1909, there were 1 recorded legal change made affecting LGBT people. In the previous year, there were changes made and 1 in the following year. A total of 13 legal changes were made in the 1900s.
- January 29Homosexual activity becomes illegal (imprisonment as punishment).Laws of Washington 1909 c 249 § 204 amended the state's sodomy law to include oral sex, added a clause to specifically criminalize voluntarily submitting to 'carnal knowledge', and lowered the penalty to "imprisonment in the state penitentiary for not more than ten years".