When was Washington County founded?

Washington County was founded in 1852, formed from Iron County, and named after George Washington.

What is the county seat of Washington County?

The county seat of Washington County is St. George.

Is there an online parcel map for Washington County?

Yes. Utah Geospatial Resource Center (UGRC), State of Utah publishes a parcel map of 130,793 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Washington County's boundary or name changed?

Washington County was created in 1852 from Iron County. Since then the Atlas of Historical County Boundaries records 15 later changes, chiefly involving Iron County, Kane County and Rio Virgen County.

Is my lot in a flood zone?

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

County · code 49053

Washington CountyUtah

Washington County is a county in southwestern Utah, with its seat in St. George. The county was created on March 3, 1852, and named after George Washington.

Founded1852
County seatSt. George
Named forGeorge Washington
Land area2,427 sq mi + 3 sq mi water
Population180,279 2020 Census
Parcels mapped130,793 checked 14 October 2026

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

Updated 20 October 2026

Census outline · seat marked

History

Formed in 1852 from Iron County

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

Washington County was created by Utah Territory on March 3, 1852, from non-county area and Iron County. Initially not fully organized, it was attached to Iron County for election, revenue, and judicial purposes. Washington County was fully organized and detached from Iron County on February 23, 1856. In 1861, the county lost territory to newly created Colorado Territory and to the defunct territories of Humboldt and St. Mary's.

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

1852
Washington County created Washington created by Utah Territory from non-county area and Iron; included parts of present Utah, Colorado, and Nevada. Washington not fully organized, attached to Iron "for election, revenue, and judicial purposes."
from Iron
3 March 1852 · Utah Terr. Laws 1851, 1st sess., sec. 13/p. 164
1861
Lost territory Washington lost to Humboldt (Utah Territory, extinct) and St. Mary's (Utah Territory, extinct).
to Humboldtto St. Mary's
18 January 1861 · Utah Terr. Laws 1861, 10th sess., p. 19
1861
Washington County created The United States created Colorado Territory from Nebraska, New Mexico, and Utah Territories, and from the former Kansas Territory. Washington lost to Colorado Territory and was eliminated from present Colorado. 28 February 1861 · U.S. Stat., vol. 12, ch. 59[1861]/pp. 172-177; Van Zandt, 141
1862
Gained territory Washington gained from St. Mary's (Utah Territory, extinct), lost to Iron.
from St. Mary'sfrom Iron
17 January 1862 · Utah Terr. Laws 1861, 11th sess., sec. 1/p. 46
1896
Became part of Utah Washington became a county in the state of Utah. 4 January 1896 · U.S. Stat., vol. 28, ch. 138 [1894]/pp. 107-112; U.S. Stat., vol. 29, procl. no. 9, [1896]/pp. 876-877; Van Zandt, 159

Show all 17 changes (12 more)

1852
Washington County created Washington created by Utah Territory from non-county area and Iron; included parts of present Utah, Colorado, and Nevada. Washington not fully organized, attached to Iron "for election, revenue, and judicial purposes."
from Iron
3 March 1852 · Utah Terr. Laws 1851, 1st sess., sec. 13/p. 164
1856
Gained territory Washington gained from Iron all along its northern line when the boundary was shifted slightly from 30 degrees, 30 minutes north latitude to four miles north of Fort Harmony.
from Iron
5 January 1856 · Utah Terr. Laws 1855, 5th sess., sec. 10/p. 7
1856
Changed Washington fully organized, detached from Iron.
Iron
23 February 1856 · Larson, 26
1861
Lost territory Washington lost to Humboldt (Utah Territory, extinct) and St. Mary's (Utah Territory, extinct).
to Humboldtto St. Mary's
18 January 1861 · Utah Terr. Laws 1861, 10th sess., p. 19
1861
Washington County created The United States created Colorado Territory from Nebraska, New Mexico, and Utah Territories, and from the former Kansas Territory. Washington lost to Colorado Territory and was eliminated from present Colorado. 28 February 1861 · U.S. Stat., vol. 12, ch. 59[1861]/pp. 172-177; Van Zandt, 141
1862
Gained territory Washington gained from St. Mary's (Utah Territory, extinct), lost to Iron.
from St. Mary'sfrom Iron
17 January 1862 · Utah Terr. Laws 1861, 11th sess., sec. 1/p. 46
1862
Lost territory Washington lost to Nevada Territory in present Nevada when Nevada Territory gained from Utah Territory. 14 July 1862 · U.S. Stat., vol. 12, ch. 173 [1862], p. 575; Van Zandt, 158-160
1864
Lost territory Washington lost to creation of Kane.
to Kane
16 January 1864 · Utah Terr. Laws 1863, 13th sess., pp. 18-19
1866
Gained territory Washington gained from Iron.
from Iron
10 January 1866 · Utah Terr. Laws 1865, 15th sess., ch. 146, sec. 2/p. 207
1866
Lost territory Washington lost to the state of Nevada when Nevada gained from Utah Territory; Washington eliminated from Nevada. 5 May 1866 · U.S. Stat., vol. 14, ch. 73[1866]/p. 43; Van Zandt, 158-159
1869
Lost territory Washington lost to creation of Rio Virgen (Utah Territory, extinct).
to Rio Virgen
18 February 1869 · Utah Terr. Laws 1869, 18th sess., ch. 10/p. 7; Atlas of Utah, 163-164
1869
Lost territory Washington lost to Kane. Act passed 19 February 1869; took effect 1 August 1869.
to Kane
1 August 1869 · Utah Terr. Laws 1869, 18th sess., ch. 18/p. 17
1872
Gained territory Washington gained all of Rio Virgen (Utah Territory); Rio Virgen eliminated.
from Rio Virgen
16 February 1872 · Utah Terr. Laws 1872, 20th sess., ch. 19, sec. 2/p. 28
1883
Gained territory Washington gained from Kane, exchanged with Iron. Act passed 9 March 1882; took effect 1 January 1883.
from Kane from Iron
1 January 1883 · Utah Terr. Laws 1882, 25th sess., ch. 52, pp. 98-101
1892
Lost territory Washington lost to Iron.
to Iron
10 March 1892 · Utah Terr. Laws 1892, 30th sess., ch. 45, p. 47
1896
Became part of Utah Washington became a county in the state of Utah. 4 January 1896 · U.S. Stat., vol. 28, ch. 138 [1894]/pp. 107-112; U.S. Stat., vol. 29, procl. no. 9, [1896]/pp. 876-877; Van Zandt, 159
1917
Boundary clarified Washington boundaries were clarified (no change).
no change
8 May 1917 · Utah Laws 1917, 12th sess., ch. 78, pp. 226-227

Land and parcels

What the maps cover in Washington

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

Parcels Good enough

Lot lines and tax-map numbers for 130,793 parcels from Utah Geospatial Resource Center (UGRC), State of Utah. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 9 October 2026 · checked 14 October 2026
Address points Missing

No public address points layer found for Washington 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

Washington by the Census

Population

180,279 2020 Census count

Housing units

74,530 2020 Census count

Land area

2,427 square miles

Water area

3 square miles

People per sq mi

74 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

Washington 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 Washington County.
washco.state.ut.us

See your own lot on these maps

Open Washington 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 Washington County

When was Washington County founded?: Washington County was founded in 1852, formed from Iron County, and named after George Washington.
What is the county seat of Washington County?: The county seat of Washington County is St. George.
Is there an online parcel map for Washington County?: Yes. Utah Geospatial Resource Center (UGRC), State of Utah publishes a parcel map of 130,793 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Washington County's boundary or name changed?: Washington County was created in 1852 from Iron County. Since then the Atlas of Historical County Boundaries records 15 later changes, chiefly involving Iron County, Kane County and Rio Virgen County.
Is my lot in a flood zone?: We do not have flood maps for Washington County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby