Washington: Language NOTE: These ACS data are estimates based on a five-year average, meaning that data gathered from 2018, 2019, 2020, 2021, and 2022 are averaged together to come up with the results shown here. There is no problem with comparing these data to census data from 2000. For a technical discussion of the "margins of error" associated with ACS estimates, please see: (https://www.census.gov/programs-surveys/acs/library/handbooks/researchers.html) Source: 2006-2022, Explore Census Data, (https://data.census.gov/cedsci/); (ACS: Table B16005 and B16005I) DATE LAST UPDATED: March 22, 2024.