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Welcome to Washington County ...

Time Zone: Washington County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Potosi is the Seat for Washington County.

Washington County was founded in 1813 and was created by taking area from Sainte Genevieve County.

From the Census Estimates for 2019, <1> Washington had a population of 24,730 people. This is a decrease of 1.87% since the last Census (which gave a population of 25,201 people in 2010).

At the time of the 2010 Census, Washington represented 0.42% of the total population of Missouri.

Below are some of the communities located in Washington County:

  • Caledonia
    (13 miles [20.9 km] to the south)
  • Irondale
    (12 miles [19.3 km] to the southeast)
    • Irondale is located in Washington County (MO)
    • Jump to our Gazetteer entry for Irondale
    • Population from the 2020 Census: 438 people
    • Jump to TripAdvisor's Tourism page for Irondale <2>
  • Mineral Point
    (5 miles [8 km] to the east)
    • Mineral Point is located in Washington County (MO)
    • Jump to our Gazetteer entry for Mineral Point
    • Population from the 2020 Census: 353 people
  • Potosi
    (2 miles [3.2 km] to the southeast)
    • Potosi is located in Washington County (MO)
    • Jump to our Gazetteer entry for Potosi
    • Population from the 2020 Census: 2,548 people
    • Jump to TripAdvisor's Tourism page for Potosi <2>

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.