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County · code 39171

Williams CountyOhio

Williams County is a county in Ohio with its seat in Bryan, formed in 1820.

  • Founded1820
  • County seatBryan
  • Named forDavid Williams
  • Land area421 sq mi + 2.4 sq mi water
  • Population37,102 2020 Census
  • Parcels mapped26,260 checked 14 October 2026
Open the free map Click any parcel in Williams County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Hillsdale, MISteuben, INFulton Bryan Census outline · seat marked

Where it is

Williams on the map of Ohio

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Counties of Ohio · Williams highlighted

History

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

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

Williams County was formed in 1820 from Darke County, Shelby County and Wood County, and named after David Williams. Bryan is the county seat.

Deeds and plats from before 1820 for land now in Williams County may have been recorded in Darke County, Shelby County and Wood County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1820
    Williams County created Williams created from Non-County Area 6 attached to Darke and Non-County Area 7 attached to Shelby; Williams overlapped part of the area disputed with Michigan Territory since 1805 that was actually under Michigan control. Williams not fully organized, attached to Wood for administrative and judicial purposes.
    from Darkefrom Shelbyfrom Wood
    · Ohio Laws 1819, 18th assy., loc., ch. 37, secs. 1-2/pp. 91-92; Chase, 3:ch. 429/pp. 2134-2135
  2. 1824
    Changed Williams fully organized, detached from Wood; Henry, Paulding, and Putnam detached from Wood, attached to Williams "for judicial purposes."
    WoodHenryPauldingPutnam
    · Ohio Laws 1823, 22d assy., loc., ch. 16/p. 19; Chase, 3:ch. 440/p. 2137
  3. 1837
    Williams County created The state of Michigan was created from Michigan Territory. Boundary dispute with Ohio over the strip running from Indiana to Lake Erie was settled in favor of Ohio. Confirmed the jurisdiction of Williams over territory along the Michigan-Ohio line. · U.S. Stat., vol. 5, ch. 99 [1836], secs. 1-2/p. 49; ch. 117 [1836]/pp. 56-57; and ch. 6 [1837]/p.144; Van Zandt, 127
  4. 1845
    Lost territory Williams lost to creation of Defiance.
    to Defiance
    · Ohio Laws 1844, 43d assy., loc., sec. 1/p. 191
  5. 1850
    Lost territory Williams lost to creation of Fulton.
    to Fulton
    · Ohio Laws 1849, 48th assy., loc., p. 682
Show all 9 changes (4 more)
  1. 1820
    Williams County created Williams created from Non-County Area 6 attached to Darke and Non-County Area 7 attached to Shelby; Williams overlapped part of the area disputed with Michigan Territory since 1805 that was actually under Michigan control. Williams not fully organized, attached to Wood for administrative and judicial purposes.
    from Darkefrom Shelbyfrom Wood
    · Ohio Laws 1819, 18th assy., loc., ch. 37, secs. 1-2/pp. 91-92; Chase, 3:ch. 429/pp. 2134-2135
  2. 1824
    Changed Williams fully organized, detached from Wood; Henry, Paulding, and Putnam detached from Wood, attached to Williams "for judicial purposes."
    WoodHenryPauldingPutnam
    · 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.
    Putnam
    · Ohio Laws 1833, 32d assy., loc., secs. 1, 13/pp. 19, 21
  4. 1834
    Changed Henry fully organized, detached from Williams.
    Henry
    · Ohio Laws 1834, 33d assy., loc., p. 11
  5. 1835
    Changed Ohio legislature authorized Williams to gain control of the area disputed with Michigan Territory. · Ohio Laws 1834, 33d assy., loc., secs. 1, 3-5/pp. 92-93
  6. 1837
    Williams County created The state of Michigan was created from Michigan Territory. Boundary dispute with Ohio over the strip running from Indiana to Lake Erie was settled in favor of Ohio. Confirmed the jurisdiction of Williams over territory along the Michigan-Ohio line. · U.S. Stat., vol. 5, ch. 99 [1836], secs. 1-2/p. 49; ch. 117 [1836]/pp. 56-57; and ch. 6 [1837]/p.144; Van Zandt, 127
  7. 1839
    Changed Paulding fully organized, detached from Williams.
    Paulding
    · Ohio Laws 1838, 37th assy., loc., p. 385
  8. 1845
    Lost territory Williams lost to creation of Defiance.
    to Defiance
    · Ohio Laws 1844, 43d assy., loc., sec. 1/p. 191
  9. 1850
    Lost territory Williams lost to creation of Fulton.
    to Fulton
    · Ohio Laws 1849, 48th assy., loc., p. 682

Land and parcels

What the maps cover in Williams

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

Williams by the Census

Population
37,102 2020 Census count
Housing units
16,561 2020 Census count
Land area
421 square miles
Water area
2.4 square miles
People per sq mi
88 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

Williams 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

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Questions

Common questions about Williams County

When was Williams County founded?
Williams County was founded in 1820, formed from Darke County, Shelby County and Wood County, and named after David Williams.
What is the county seat of Williams County?
The county seat of Williams County is Bryan.
Is there an online parcel map for Williams County?
Yes. Ohio Geographically Referenced Information Program (OGRIP, Ohio DAS) statewide compilation of county auditor parcels publishes a parcel map of 26,260 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Williams County's boundary or name changed?
Williams County was created in 1820 from Darke County, Shelby County and Wood County. Since then the Atlas of Historical County Boundaries records 8 later changes, chiefly involving Henry County, Paulding County and Putnam County.
Is my lot in a flood zone?
We do not have flood maps for Williams 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