My Local Guide

Ancient Earthworks and a Rural Southern Landscape

Adams County, Ohio

Adams County is home to Serpent Mound, an Indigenous earthwork that gives the area an important archaeological dimension. West Union serves as the county seat and largest village. The county’s parks and preserves add natural settings alongside a rural township landscape with roots in Ohio’s early territorial period. The U.S. Census Bureau estimated 27,865 residents in Adams County, Ohio, on July 1, 2025.

Adams County at a Glance

Population27,865 (July 1, 2025 Census estimate)
County SeatWest Union
StateOhio
Established1797
ZIP CodesVary by address
Total Area, Including Water586.285 square miles, including water (2020 Census geography)
Road InformationState transportation resources below
Area CodesSee local phone listings
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Adams County photograph
Discover Adams County

Adams County

Adams County was established in 1797 and named for John Adams, the second United States president. Its history as a county is much younger than the Indigenous earthworks preserved at Serpent Mound. West Union serves as the county seat and largest village. These different time scales are central to the area’s identity: early county government forms one chapter, while archaeological landscapes point to societies and cultural traditions that existed long before modern state boundaries.

West Union offers a local civic center, while Serpent Mound provides a specific archaeological destination elsewhere in the county. Parks and preserves add another reason to look beyond the village streets. An effective introduction pairs the county’s smaller communities with a carefully chosen historical or natural site. At an earthwork landscape, allowing time for interpretation helps keep the visit focused on its cultural significance rather than treating it simply as scenery.

What Shapes Us

Local Character

Adams County is home to Serpent Mound, an Indigenous earthwork that gives the area an important archaeological dimension. West Union serves as the county seat and largest village.

Community History

Adams County was established in 1797 and named for John Adams, the second United States president. Its history as a county is much younger than the Indigenous earthworks preserved at Serpent Mound.

Around the County

West Union offers a local civic center, while Serpent Mound provides a specific archaeological destination elsewhere in the county. Parks and preserves add another reason to look beyond the village streets.

Ancient places bring depth to the rural landscape.
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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.

County photographs from Wikimedia Commons; images may be cropped for display.

Ohio statewide resources

Government

Use these official Ohio sources to reach state offices, elected leaders, public records, legislation, and core government services.

  • Ohio.gov — State government services, agencies, forms, and resident information — Official website
  • Governor of Ohio — Executive office news, priorities, appointments, and contact information — Official website
  • Ohio General Assembly — State legislation, lawmakers, committees, sessions, and bill tracking — Official website
  • Ohio Secretary of State — Elections, business filings, records, and statewide administrative services — Official website
  • Auditor of State — Public audits, local government resources, fraud reporting, and financial oversight — Official website
  • Ohio Treasurer of State — State treasury programs, financial education, investments, and public funds information — Official website
  • Supreme Court of Ohio — State judicial information, court resources, opinions, forms, and services — Official website

Get to Know Adams County

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

Local Questions

Adams County Questions, Answered

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

27,865 (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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