When was Sheridan County founded?

Sheridan County was founded in 1888, formed from Johnson County, and named after Philip Sheridan.

What is the county seat of Sheridan County?

The county seat of Sheridan County is Sheridan.

Is there an online parcel map for Sheridan County?

Yes. Sheridan County publishes a parcel map of 19,137 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Sheridan County's boundary or name changed?

Sheridan County was created in 1888 from Johnson County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Big Horn County and Johnson County.

Is my lot in a flood zone?

We do not have flood maps for Sheridan County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Sheridan County, Wyoming: parcels, history and offices

Where it is

Sheridan on the map of Wyoming

Wyoming has 23 counties and county equivalents, each with its own records office. Shapes with a page are links.

History

Formed in 1888 from Johnson County

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

Sheridan County was created on March 9, 1888 by Wyoming Territory from Johnson County. The county was named after Philip Sheridan. Sheridan lost territory to Big Horn County in 1890, and lost more territory to Crook County in 1911 when the boundary was adjusted to run on federal land survey lines.

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

1888
Sheridan County created Sheridan created by Wyoming Territory from Johnson; Sheridan not fully organized, attached to Johnson for administrative and judicial purposes.
from Johnson
9 March 1888 · Wyo. Terr. Laws 1888, 10th leg., ch. 90, sec. 62/p. 218; "Crook County v. Sheridan County," in Wyoming Rpts., 17:424-467
1888
Changed Sheridan fully organized, detached from Johnson.
Johnson
11 May 1888 · Trenholm, 1:331
1890
Lost territory Sheridan lost to creation of Big Horn; Big Horn not fully organized, part attached to Sheridan "for judicial, revenue and election purposes."
to Big Horn
12 March 1890 · Wyo. Terr. Laws 1890, 11th leg., ch. 48/pp. 80-83
1890
Became part of Wyoming Sheridan became a county in the state of Wyoming. 10 July 1890 · Wyoming Constitution 1889, art. 12 in Swindler, 10:493; U.S. Stat., vol. 26, ch. 664[1890]/pp. 222-226; Van Zandt, 145
1897
Changed Big Horn fully organized, detached from Sheridan.
Big Horn
4 January 1897 · Trenholm, 1:331
1911
Lost territory Sheridan lost territory along former boundary with Crook when boundary was adjusted to run on federal land survey lines. Southern boundary of Sheridan was clarified (no change).
to Crook
21 February 1911 · Wyo. Laws 1911, 11th leg., ch. 77, secs. 5, 7, 11/pp. 106-108, 111
1929
Boundary clarified Boundary between Sheridan and Johnson clarified (no change).
with Johnsonno change
7 February 1929 · Wyo. Laws 1929, 20th leg., ch. 18/pp. 23-24

Land and parcels

What the maps cover in Sheridan

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

Parcels Good enough

Lot lines and tax-map numbers for 19,137 parcels from Sheridan County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 16 October 2026
Address points Missing

No public address points layer found for Sheridan County yet.
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

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

Sheridan by the Census

Population

30,921 2020 Census count

Housing units

14,884 2020 Census count

Land area

2,523 square miles

Water area

3.1 square miles

People per sq mi

12 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Zoning and code

Planning and Zoning Commissionfrom sheridancountywy.gov

County government

County government
The official website of Sheridan County.
sheridancounty.com

See your own lot on these maps

Open Sheridan 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.

Open the free map no sign-in Pro early access

Questions

Common questions about Sheridan County

When was Sheridan County founded?: Sheridan County was founded in 1888, formed from Johnson County, and named after Philip Sheridan.
What is the county seat of Sheridan County?: The county seat of Sheridan County is Sheridan.
Is there an online parcel map for Sheridan County?: Yes. Sheridan County publishes a parcel map of 19,137 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Sheridan County's boundary or name changed?: Sheridan County was created in 1888 from Johnson County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Big Horn County and Johnson County.
Is my lot in a flood zone?: We do not have flood maps for Sheridan County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Sheridan CountyWyoming