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County · code 39137

Putnam CountyOhio

Putnam County is a county in Ohio, with its seat in Ottawa, formed in 1820.

  • Founded1820
  • County seatOttawa
  • Named forIsrael Putnam
  • Land area483 sq mi + 1.8 sq mi water
  • Population34,451 2020 Census
  • Parcels mapped30,523 checked 14 October 2026
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Updated

AllenHenryDefianceVan Wert Ottawa Census outline · seat marked

Where it is

Putnam on the map of Ohio

Ohio has 88 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Ohio · Putnam highlighted

History

Formed in 1820 from Logan County, Shelby County and Wood County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Putnam County was created in 1820 from parts of Logan and Shelby counties, with additional territory from Non-County Area 7 attached to Shelby, and was named after Israel Putnam. At its creation, Putnam County was not fully organized and was attached to Wood County for administrative and judicial purposes. In 1824, Putnam was detached from Wood and attached to Williams for judicial purposes, then became fully organized and detached from Williams in 1834. In 1848, Putnam gained territory from Van Wert County but lost territory to Allen County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1820
    Putnam County created Putnam created from Non-County Area 9 attached to Logan and Non-County Area 7 attached to Shelby; Putnam not fully organized, attached to Wood for administrative and judicial purposes.
    from Loganfrom Shelbyfrom Wood
    · Ohio Laws 1819, 18th assy., loc., ch. 37, secs. 1-2/pp. 90-91; Chase, 3:ch. 429/pp. 2134-2135
  2. 1824
    Changed Putnam detached from Wood, attached to Williams "for judicial purposes."
    WoodWilliams
    · Ohio Laws 1823, 22d assy., loc., ch. 16/p. 19; Chase, 3:ch. 440/p. 2137
  3. 1834
    Changed Putnam fully organized, detached from Williams.
    Williams
    · Ohio Laws 1833, 32d assy., loc., secs. 1, 13/pp. 19, 21
  4. 1848
    Gained territory Putnam gained from Van Wert, lost to Allen.
    from Van Wertfrom Allen
    · Ohio Laws 1847, 46th assy., loc., secs. 1-4, 7/pp. 128-129

Land and parcels

What the maps cover in Putnam

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Putnam by the Census

Population
34,451 2020 Census count
Housing units
13,824 2020 Census count
Land area
483 square miles
Water area
1.8 square miles
People per sq mi
71 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Putnam County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Putnam County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Putnam County

When was Putnam County founded?
Putnam County was founded in 1820, formed from Logan County, Shelby County and Wood County, and named after Israel Putnam.
What is the county seat of Putnam County?
The county seat of Putnam County is Ottawa.
Is there an online parcel map for Putnam County?
Yes. A public source publishes a parcel map of 30,523 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Putnam County's boundary or name changed?
Putnam County was created in 1820 from Logan County, Shelby County and Wood County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Williams County, Allen County and Van Wert County.
Is my lot in a flood zone?
We do not have flood maps for Putnam County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door