Champaign County, Ohio
county in Ohio, United States
Champaign County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 38,714. Its county seat and largest city is Urbana. The county takes its name from the French word for "open level country". Champaign County became the 18th of 88 Ohio counties on March 1, 1805. It was formed from parts of Greene and Franklin counties by legislative action. Champaign County comprises the Urbana, OH Micropolitan Statistical Area, which is also included in the Dayton–Springfield–Sidney, OH Combined Statistical Area.
Geography
According to the U.S. Census Bureau, the county has a total area of 430 square miles (1,100 km2), of which 429 square miles (1,110 km2) is land and 1.2 square miles (3.1 km2) (0.3%) is water.
Adjacent counties
Logan County (north)
Union County (northeast)
Madison County (southeast)
Clark County (south)
Miami County (southwest)
Shelby County (northwest)
Demographics
Racial and ethnic composition
2020 census
As of the 2020 census, the county had a population of 38,714. The median age was 42.6 years, 22.8% of residents were under the age of 18, and 19.3% were 65 years of age or older.
“Champaign County, Ohio” enters the record as county in Ohio, United States. Crown Archives preserves that source wording while asking what Champaign, County and Ohio can confirm, complicate or overturn.
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“Champaign County, Ohio” is worth following because a concise public description often conceals a longer documentary argument. Here, Champaign, County and Ohio provides the most credible route into that argument.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 16, 2026. The linked authority identifier is Q389573. VIAF identifies the subject as 153606504. The Library of Congress control number is n80109357. Authority coordinates are 40.140, -83.770. 5 of 5 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 2020 and 1805.
Architectural summaries often privilege surviving fabric and can understate demolished phases, contested use or displaced communities. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Three-step research path
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This entry incorporates text from “Champaign County, Ohio” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.