When was Hot Springs County founded?

Hot Springs County was founded in 1911, formed from Big Horn County, Fremont County and Park County, and named after hot spring.

What is the county seat of Hot Springs County?

The county seat of Hot Springs County is Thermopolis.

Is there an online parcel map for Hot Springs County?

Yes. Hot Springs County publishes a parcel map of 3,897 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Hot Springs County's boundary or name changed?

Hot Springs County was created in 1911 from Big Horn County, Fremont County and Park County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Park County, Big Horn County and Fremont County.

Is my lot in a flood zone?

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

County · code 56017

Hot Springs CountyWyoming

Hot Springs County is a Wyoming county with its seat in Thermopolis, formed on February 21, 1911.

Founded1911
County seatThermopolis
Named forhot spring
Land area2,004 sq mi + 2 sq mi water
Population4,621 2020 Census
Parcels mapped3,897 checked 16 October 2026

Open the free map Click any parcel in Hot Springs County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 20 October 2026

Census outline · seat marked

History

Formed in 1911 from Big Horn County, Fremont County and Park County

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

Hot Springs County was created from Big Horn, Fremont, and Park counties, but was not fully organized until January 6, 1913, when it was detached from those three counties for judicial, revenue, and election purposes. The county is named after hot springs in the area.

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

1911
Hot Springs County created Hot Springs created from Big Horn, Fremont, and Park. Hot Springs not fully organized, attached to Big Horn, Fremont, and Park "for judicial, revenue and election purposes." Technically, Hot Springs had been created on 9 February 1911, but the several boundary laws of February 1911 were not passed in the intended sequence and mapping them in strict chronological order is not practical. By treating the law of 21 February as the basic structure that the other laws modify, the mapping reflects the intent of the legislature.
from Big Horn from Fremont from Park
21 February 1911 · Wyo. Laws 1911, 11th leg., ch. 9/pp. 9-11
1913
Changed Hot Springs fully organized, detached from Big Horn, Fremont, and Park.
Big Horn Fremont Park
6 January 1913 · Trenholm, 2:518
1929
Lost territory Hot Springs lost to Park.
to Park
7 February 1929 · Wyo. Laws 1929, 20th leg., ch. 22/pp. 26-27
1931
Gained territory Hot Springs gained from Park.
from Park
5 March 1931 · Wyo. Laws 1931, 21st leg., ch. 96/pp. 167-168

Land and parcels

What the maps cover in Hot Springs

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

Parcels Good enough

Lot lines and tax-map numbers for 3,897 parcels from Hot Springs County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 30 June 2026 · checked 16 October 2026
Address points Missing

No public address points layer found for Hot Springs 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

Hot Springs by the Census

Population

4,621 2020 Census count

Housing units

2,551 2020 Census count

Land area

2,004 square miles

Water area

2 square miles

People per sq mi

2 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

Hot Springs County's official site

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

County government

County government
The official website of Hot Springs County.
hscounty.com

See your own lot on these maps

Open Hot Springs 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 Hot Springs County

When was Hot Springs County founded?: Hot Springs County was founded in 1911, formed from Big Horn County, Fremont County and Park County, and named after hot spring.
What is the county seat of Hot Springs County?: The county seat of Hot Springs County is Thermopolis.
Is there an online parcel map for Hot Springs County?: Yes. Hot Springs County publishes a parcel map of 3,897 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Hot Springs County's boundary or name changed?: Hot Springs County was created in 1911 from Big Horn County, Fremont County and Park County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Park County, Big Horn County and Fremont County.
Is my lot in a flood zone?: We do not have flood maps for Hot Springs County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby