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Franklin County, Washington

Explore local resources and participating businesses in Franklin County, Washington.

Franklin County at a Glance

Population102,612 (July 1, 2025 Census estimate)
County SeatPasco
Largest City (2026)Pasco (2026 OFM)
Year Organized1883 (organized; NACo County Explorer)
ZIP Code Examples99301, 99326, 99335
Total Area, Including Water1,264.959 square miles, including water (2020 Census geography)
Major RoutesI-182, US 395, US 12
Local Area Codes509
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Discover Franklin County

Franklin County

Franklin County was organized in 1883 from part of Whitman County and named for Benjamin Franklin. Ainsworth held the earlier seat before railway-related relocation brought county government to Pasco in 1886. Regular airmail service added another transportation chapter in 1926. The courthouse history and local historical society's accounts connect these events with the surrounding river landscape. Together they show how the county's civic location and commercial connections changed with different transport systems rather than developing independently of them.

Begin with Pasco's courthouse history, then use local historical interpretation to follow the earlier Ainsworth connection. Railway and aviation themes can provide separate focuses for a visit. Choose a specific public riverfront destination if adding an outdoor stop, since the Columbia and Snake are large geographic references rather than single attractions. Comparing historical maps with present streets can make the seat's movement easier to understand.

What Shapes Us

Place And Character

Pasco anchors Franklin County in Washington, where the Columbia and Snake rivers connect local history with a wider travel landscape.

The Local Story

Franklin County was organized in 1883 from part of Whitman County and named for Benjamin Franklin. Ainsworth held the earlier seat before railway-related relocation brought county government to Pasco in 1886.

Explore The County

Begin with Pasco's courthouse history, then use local historical interpretation to follow the earlier Ainsworth connection. Railway and aviation themes can provide separate focuses for a visit.

Follow the transport connections that shaped a county's civic center.
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Lonnie Rouse shuffled into a wood-paneled conference room at the Washington state Capitol in March 2018. It had…

Read the Story Oct 26, 2026 • Read at source
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Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.

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County Resources

Find the Right Local Connection

Start with the organization responsible for the service you need. Follow its official link for current requirements, office locations and availability.

Get to Know Franklin County

Useful answers for residents, visitors and anyone planning their next step.

Local Questions

Franklin County Questions, Answered

Explore practical details about the county and the organizations that serve it.

102,612 (July 1, 2025 Census estimate). This is a dated Census Bureau estimate, rather than a live resident count.

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Meet Local Businesses

Support the businesses that help make our communities thrive. From family-owned shops and restaurants to trusted local services, discover businesses worth visiting throughout the county.

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Make Time to Explore

Browse local places by the kind of day you have in mind.

Explore Franklin County

Featured local businesses

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Parks and outdoor places

Sacajawea Historical State Park — Plan a visit using the official park information.

Getting around

Ben Franklin Transit

A New Stop, a Local ConnectionExplore the Listings Below
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