Ada, Ohio
village in Hardin County, Ohio, United States
Ada ( AY-də) is a village in Hardin County, Ohio, United States, located about 69 miles (111 km) southwest of Toledo. As of the 2020 census, its population was 5,334. It is the home of Ohio Northern University.
History
Following the 1817 Treaty of Fort Meigs, the Shawnee Indians held reservation land at Hog Creek near Ada. Ada itself was originally called Johnstown, platted in 1853 by S. M. Johnson when the railroad was extended to that point. When a post office was established it was called Ada Post Office, named after the postmaster's daughter, Ada. The post office has been in operation since 1854.
The growth of the village is due in large part to the founding of the Ohio Normal School, now known as Ohio Northern University. The university was founded in 1871 by Henry Solomon Lehr, just eighteen years after Ada was first settled. Today, Ada is the second largest incorporated community in Hardin County.
“Ada, Ohio” enters the record as village in Hardin County, Ohio, United States. Crown Archives preserves that source wording while asking what Ohio, village and Hardin can confirm, complicate or overturn.
Why this record matters
“Ada, Ohio” is worth following because a concise public description often conceals a longer documentary argument. Here, Ohio, village and Hardin provides the most credible route into that argument.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q1934356. VIAF identifies the subject as 151292341. The Library of Congress control number is n82077287. Authority coordinates are 40.769, -83.822. 3 of 6 selected statements include explicit references; 2 carry qualifiers and 1 use preferred rank. The first chronological checks are 2020, 1817, 1853 and 1854.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. 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.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Ada, Ohio”, its source revision and the description used here.
- Expand the search: follow Ada, Ohio primary sources, Ada, Ohio archive and Ohio research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Ada, Ohio”?
- What physical evidence or contemporary plan supports the description?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Ada, 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.