Formed March 1, 1807 from Montgomery County — named for the Miami people of the Great Miami River valley · county seat Troy. Repository addresses, online record links, and a free printable record checklist below.
Short episodes that walk through Miami County's records, one record type at a time.
Formation · Settlers & Migration · Probate · Land · Tax · Churches · Newspapers · Where to Look
Watch on YouTube201 W. Main St., Troy, OH 45373 · (937) 440-6050
Estates, guardianships, and trusts from 1807 to present. Marriage records 1807–present (Ohio probate courts hold marriage records on an ongoing basis, not just historically). Also holds birth records 1853–1908 and death records 1867–1908.
201 W. Main St., Troy, OH 45373 (Safety Building) · (937) 440-6040
Deeds, mortgages, and liens.
201 W. Main Street, 3rd Floor, Safety Building, Troy, OH 45373 · (937) 440-6010
co.miami.oh.us/117/Clerk-of-Courts
Divorces, civil suits (including partition suits that divide land among heirs), and Common Pleas journals. Before 1852, this court also handled wills and estates.
201 W. Main Street, Troy, OH 45373 · (937) 440-5925
Current tax lists and property transfer records. Early tax duplicates are on FamilySearch and at the Ohio History Connection.
510 W. Water St., Suite 210, Troy, OH 45373 (Hobart Government Center)
Books, maps, manuscripts, wills, land records, and microfilm/fiche for marriage, census, birth, and death records, plus in-library Ancestry, Fold3, HeritageQuest, and Ohio Memory access. As of 2025 shares this location with the Troy Historical Society.
This center moved in 2025 — older directory listings still show its former address on W. Main St. Use the address above.
PO Box 808, Piqua, OH 45356
Active OGS chapter. Founded 1950 as the Miami County Historical Society, renamed in 1987 when it became the OGS chapter, combining both roles under one organization. Meets bi-monthly (3rd Tuesday), February through October, partnering with the Piqua Public Library's Local History Department.
Museum of Troy History: 124 E. Water St., Troy, OH 45373
A separate, city-specific organization (est. 1965) from MCHGS above — Troy's own local history society, distinct from the countywide genealogical society. MCHGS notes there are nine historical/genealogical societies across Miami County's various communities, each with a different local focus. Call ahead to confirm current hours.
County-level research goes through MCHGS; Troy-specific history goes through this society.
510 W. Water St., Suite 130, Troy, OH 45373 · (937) 573-3500
miamicountyhealth.net/birth--death-certificates
Births and deaths from December 20, 1908 forward. Earlier records (birth 1853–1908, death 1867–1908) are at the Probate Court above.
Find A Grave — Miami County, Interment.net, and OhioGravestones.org.
Not sure which office has what? See Which County Office Holds What.
Many Miami County record books are filmed and free to view at FamilySearch (free account required).
In Full-Text Search, add Miami County, Ohio as the place to find names inside handwritten deeds, wills, and court books. How to use it.
Miami County was formed in 1807 from Montgomery County. For records made before then, search the parent county:
Most of Miami County's land was federal Congress Lands, surveyed in townships and sections and first sold through U.S. land offices. The first buyer of each tract received a federal patent.
Titles that covered Miami County, historic and current, with where to search each one. Not every historic title has been digitized — several survive only on microfilm.
| Title | Years | Where to Search |
|---|---|---|
| Piqua Gazette | 1820-1826 | Chronicling America (Library of Congress) |
| Miami Valley Register / Piqua Register | 1841-1849 | Chronicling America (Library of Congress) |
| Miami County Democrat (Piqua) | 1860-1861 | Chronicling America (Library of Congress) |
| Piqua Daily Call | 1883-2007 | Ohio Memory (partial); microfilm — Piqua Public Library |
| Troy Daily News / Miami Valley Today | 1909-present | Ohio Memory (partial); microfilm — Troy-Miami County Public Library |
| Troy Times | 1850s-1900s | Microfilm only — Troy-Miami County Public Library Local History & Genealogy Center |
Fill in what you're looking for, print it, and take it with you to the courthouse or library.
Brick Walls & Buckeyes
brickwallsbuckeyes.com · Miami County, Ohio
Addresses and links last checked October 2026.
County guides, record walkthroughs, and brick wall breakthroughs. Subscribe on YouTube and tap the bell so new episodes find you.
Subscribe on YouTube