When was Tooele County founded?

Tooele County was founded in 1850, formed from Great Salt Lake County and Salt Lake County.

What is the county seat of Tooele County?

The county seat of Tooele County is Tooele.

Is there an online parcel map for Tooele County?

Yes. Utah Geospatial Resource Center (UGRC), State of Utah publishes a parcel map of 36,651 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Tooele County's boundary or name changed?

Tooele County was created in 1850 from Great Salt Lake County and Salt Lake County. Since then the Atlas of Historical County Boundaries records 14 later changes, chiefly involving St. Mary's County, Juab County and Salt Lake County.

Who issues building permits in Tooele County?

The county's page on building permits: Building Permit. Inside a city or town, ask that city first.

Is my lot in a flood zone?

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

County · code 49045

Tooele CountyUtah

Tooele County is a county in Utah with its seat in Tooele. It was created on January 31, 1850, from the territory of Great Salt Lake County.

Founded1850
County seatTooele
Land area6,942 sq mi + 344 sq mi water
Population72,698 2020 Census
Parcels mapped36,651 checked 14 October 2026

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

Updated 20 October 2026

Census outline · seat marked

History

Formed in 1850 from Great Salt Lake County and Salt Lake County

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

Originally spelled Tuilla, Tooele County was created in 1850 by the state of Deseret but was not fully organized until 1851, when it was detached from Great Salt Lake County. Over the following decades, the county lost territory to the creation of Carson, Humboldt, St. Mary's, Shambip, and Box Elder counties, while later gaining territory from St. Mary's and other counties.

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

1850
Tooele County created Tooele (spelled Tuilla here) created by the state of Deseret to cover the Tuilla/Tooele Valley; Tuilla not fully organized, attached to Great Salt Lake (now Salt Lake) "for judicial, revenue, and election purposes."
from Great Salt Lakefrom Salt Lake
31 January 1850 · Morgan, 47-48, 145
1851
Eliminated The state of Deseret was dissolved by its General Assembly, upon recommendation of Brigham Young. State of Deseret counties, including Tooele, continued to operate. 5 April 1851 · Brown, Cannon, and Jackson, 90; Powell, 139
1854
Lost territory Tooele lost to creation of Carson (Utah Territory, extinct).
to Carson
17 January 1854 · Utah Terr. Laws 1853, 3rd sess., p. 19
1856
Lost territory Tooele lost to creation of Humboldt (Utah Territory, extinct) and St. Mary's (Utah Territory, extinct); Tooele eliminated from present Nevada. Humboldt and St. Mary's not fully organized, both attached to Tooele "for election, revenue, and judicial purposes."
to Humboldtto St. Mary's
5 January 1856 · Utah Terr. Laws 1855, 5th sess., secs. 2-3/pp. 5-6 and p. 8
1896
Became part of Utah Tooele 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)

1850
Tooele County created Tooele (spelled Tuilla here) created by the state of Deseret to cover the Tuilla/Tooele Valley; Tuilla not fully organized, attached to Great Salt Lake (now Salt Lake) "for judicial, revenue, and election purposes."
from Great Salt Lakefrom Salt Lake
31 January 1850 · Morgan, 47-48, 145
1851
Eliminated The state of Deseret was dissolved by its General Assembly, upon recommendation of Brigham Young. State of Deseret counties, including Tooele, continued to operate. 5 April 1851 · Brown, Cannon, and Jackson, 90; Powell, 139
1851
Changed Tooele (originally Tuilla) fully organized; detached from Great Salt Lake (now Salt Lake).
TuillaGreat Salt LakeSalt Lake
10 June 1851 · Tooele County Daughters of Utah Pioneers, 24
1852
Boundary clarified Tooele boundaries were redefined by Utah Territory. Tooele gained non-county area, lost to Desert (Utah Territory, extinct), Great Salt Lake (now Salt Lake), and Utah; Tooele included parts of present Utah and Nevada.
with Desert with Great Salt Lakewith Salt Lakewith Utahno change
3 March 1852 · Utah Terr. Acts 1851, 1st sess., sec. 8/p. 163
1854
Lost territory Tooele lost to creation of Carson (Utah Territory, extinct).
to Carson
17 January 1854 · Utah Terr. Laws 1853, 3rd sess., p. 19
1856
Lost territory Tooele lost to creation of Humboldt (Utah Territory, extinct) and St. Mary's (Utah Territory, extinct); Tooele eliminated from present Nevada. Humboldt and St. Mary's not fully organized, both attached to Tooele "for election, revenue, and judicial purposes."
to Humboldtto St. Mary's
5 January 1856 · Utah Terr. Laws 1855, 5th sess., secs. 2-3/pp. 5-6 and p. 8
1856
Lost territory Tooele lost to creation of Shambip (Utah Territory, extinct).
to Shambip
12 January 1856 · Utah Terr. Laws 1855, 5th sess., pp. 7-8
1859
Changed Humboldt (Utah Territory, extinct) and St. Mary's (Utah Territory, extinct) detached from Tooele, both attached to Carson (Utah Territory, extinct) "for election, revenue and judicial purposes."
HumboldtSt. Mary'sCarson
17 January 1859 · Utah Terr. Laws 1858, 8th sess., ch. 11/pp. 19-20
1861
Gained territory Tooele gained from St. Mary's (Utah Territory, extinct); Tooele included territory in present Utah and Nevada.
from St. Mary's
18 January 1861 · Utah Terr. Laws 1861, 10th sess., p. 19
1862
Gained territory Tooele gained from Cedar (Utah Territory, extinct), Desert (Utah Territory, extinct), Great Salt Lake (now Salt Lake), Juab, Shambip (Utah Territory, extinct), and St. Mary's (Utah Territory, extinct); lost to Box Elder.
from Cedar from Desert from Great Salt Lakefrom Salt Lakefrom Juabfrom Shambipfrom St. Mary'sfrom Box Elder
17 January 1862 · Utah Terr. Laws 1861, 11th sess., sec. 13/p. 49
1862
Lost territory Tooele 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
1866
Boundary clarified Tooele boundaries were redefined (no change).
no change
10 January 1866 · Utah Terr. Laws 1865, 15th sess., ch. 146, sec. 17/p. 209
1866
Lost territory Tooele lost to the state of Nevada when Nevada gained from Utah Territory; Tooele eliminated from Nevada. 5 May 1866 · U.S. Stat., vol. 14, ch. 73[1866]/p. 43; Van Zandt, 158-159
1870
Lost territory Tooele lost to Juab.
to Juab
18 February 1870 · Utah Terr. Laws 1870, 19th sess., p. 127
1880
Gained territory Tooele gained part of the islands and waters of Great Salt Lake that had previously been attached to Salt Lake.
from Salt Lake
18 February 1880 · Utah Terr. Laws 1880, 24th sess., ch. 14, sec. 5/p. 17
1894
Changed Boundary between Tooele and Juab was adjusted to run on the second standard parallel south (no change).
Juab
8 March 1894 · Utah Terr. Laws 1894, 31st sess., ch. 35, pp. 31-32
1896
Became part of Utah Tooele 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

Land and parcels

What the maps cover in Tooele

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

Parcels Good enough

Lot lines and tax-map numbers for 36,651 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 Tooele 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

Tooele by the Census

Population

72,698 2020 Census count

Housing units

23,002 2020 Census count

Land area

6,942 square miles

Water area

344 square miles

People per sq mi

10 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.

Records

Assessor and property records 435-843-3102from tooeleco.gov · checked 13 October 2026

Permits

Building Permitfrom tooelecountypermitrequest.portal.iworq.net

Zoning and code

Planning and zoning 435-843-3204from tooeleco.gov · checked 13 October 2026
Data Center Ordinance - Draft Onlyfrom tooeleco.gov

GIS and maps

County GIS and maps 435-843-3453from tooeleco.gov · checked 13 October 2026

County government

County government
The official website of Tooele County.
tooeleco.gov

See your own lot on these maps

Open Tooele 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 Tooele County

When was Tooele County founded?: Tooele County was founded in 1850, formed from Great Salt Lake County and Salt Lake County.
What is the county seat of Tooele County?: The county seat of Tooele County is Tooele.
Is there an online parcel map for Tooele County?: Yes. Utah Geospatial Resource Center (UGRC), State of Utah publishes a parcel map of 36,651 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Tooele County's boundary or name changed?: Tooele County was created in 1850 from Great Salt Lake County and Salt Lake County. Since then the Atlas of Historical County Boundaries records 14 later changes, chiefly involving St. Mary's County, Juab County and Salt Lake County.
Who issues building permits in Tooele County?: The county's page on building permits: Building Permit. Inside a city or town, ask that city first.
Is my lot in a flood zone?: We do not have flood maps for Tooele County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby