Australian Population in Columbia County, WA by City : 2025 Ranking & Insights

U.S. Census data shows zero Australian residents in Columbia County, WA. The only incorporated city included in this analysis*, Dayton, also reports no Australian presence. While neither city nor county records any Australian population, the section below explores demographic patterns in Washington and beyond.

Top 5 cities with the largest Australian population in Columbia County

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  • 1
    Dayton
    Australian population in Dayton is 0
    - of Dayton population is Australian

Overview of Australian population in Columbia County

  • Population Count and Percentage: American Community Survey data documents Columbia County with zero Australian residents among its 3,996 total population (0.0%), placing the county at the lowest percentile nationally and within Washington, where state demographic data shows 0.059% of residents are Americans who have Australian ancestry.
  • Comparison to State and National Averages: Census Bureau's ACS records document Columbia County with zero Australian residents, contrasting with Washington's statewide Australian demographic representation of 0.059%, and the national average of 0.029%.
  • Share of Total State Population: Official American Community Survey data shows Columbia County with zero Australian residents, while Washington maintains over 4,579 Australian Americans statewide, placing the county among few jurisdictions without representation of this significant state demographic group.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey data documents Columbia County with zero Australian residents per square mile, placing the county among jurisdictions without Australian demographic communities, while Washington's state averages maintain 0.069 residents per square mile.
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Australian Population in Columbia County — Dayton

View Methodology
American Community Survey data [1] indicate Dayton — the only incorporated city in Columbia County included in this analysis* — recorded zero residents that are Americans who have Australian ancestry. The table below provides broader statistics, including total population figures, density measures, and demographic distributions for Dayton, based on current ACS data.
cities in Columbia County, WA ranked by Australian population count
Rank by Australian Population
City
Australian Population
% of Total City Population
% of Total Columbia County Australian Population
5 Year Rank Trend
1 Dayton 0 - -
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Methodology

This ranking list is based on data from the American Community Survey (ACS) 5-Year Estimates, conducted by the U.S. Census Bureau. The ACS is one of the most reliable sources for understanding population trends across different locations, and it provides estimates for various racial and ethnic groups at city, county, state and all geography levels down to the Census block group.
This list ranks city in Columbia County, WA by their Australian population, using the most recent ACS data available.

How the Census defines Australian population

The U.S. Census Bureau allows people to self-identify their ancestry, meaning individuals can write upto ancestries when responding to the survey. In this ranking, we include everyone who identifies as having Australian ancestry, whether alone or in combination with another ancestry.
Here are a few important things to know about how ancestry is reported:
  • Some people identify as Australian alone, while others identify as Australian along with another race (such as Australian and German).
  • We’ve used the “Australian alone or in any combination” category unless noted otherwise, which gives a broader picture of the Australian population in each area.

How We Ranked the Data

This ranking is based on the total number of people who identified as Australian alone or in combination in city. To provide additional context, we’ve also included two key percentages:
  1. % of Total City Population – This shows what percentage of the total state population identifies as Australian .
  2. % of Total Columbia County Australian Population – This tells us how much of the entire U.S. Australian population lives in that state.
To keep things simple, all population numbers have been rounded to the nearest whole number, and percentages are rounded to one decimal place. Because of rounding, some percentages may not add up to exactly 100%.

Things to Keep in Mind

Like all survey-based data, ACS estimates come with some limitations. Here are a few things to be aware of:
  • In places with very small Australian populations, the numbers may not be reported at all due to privacy protections or sampling variability in the survey.
  • Since the ACS is based on a sample, the numbers are estimates, not exact counts. That means they may slightly differ from other sources like the decennial U.S. Census.
  • City that don’t have any reported Australian population are not included in the ranking but are listed separately below for reference.
This ranking is meant to provide a clear, data-driven look at where Australian populations are most concentrated while keeping the numbers easy to understand.

Sources

  1. 2019-2023 5-Year Estimates.
  2. 2023.