Other pages about the topic: Population

Local Update of Census Addresses (LUCA)

The Local Update of Census Addresses operation or LUCA, is a voluntary decennial census operation. LUCA is the only opportunity prior to the 2020 Census for tribal, state, and local governments to review and update the U.S. Census Bureau’s residential address list and flag group quarters for their jurisdiction.

Counting people experiencing homelessness during the 2020 Census

The intent of the 2020 Census is to count everyone living in the United States, including people experiencing homelessness or living in transitory locations. General information about how the homeless will be counted and categorized in the 2020 Census results is provided below, as well as references to more detailed explanations.

Hard-to-count population - 2020 Census

Understand the typology of hard-to-count (HTC)

In every census, there are certain socioeconomic and demographic factors that include age, housing status, and language that can influence self-response. The traditional socioeconomic and demographic factors that have tended to correlate with lower levels of self-response have included:

Components of population change


2010 Population  6,724,540
Plus Births  1,041,094
Less Deaths    -671,075
Plus Net Migration     769,841

Population by age, mapped by county

Median Age, 2022

In 2010, the median age of persons living in Washington state was 37.3 years. In 2022 the median age had increased to 38.6 years.

Jefferson County had the highest median age in 2010 at 53.9 years. By 2022, the median age in Jefferson County had reached 60.7 years.

Hispanic population as a percent of total population


In 2020, the highest percentages of Hispanic residents were found in central Washington with Adams (69.2%), Franklin (55.9%), and Yakima (51.9%) counties posting the highest shares.