When was Millard County founded?

Millard County was founded in 1851, and named after Millard Fillmore.

What is the county seat of Millard County?

The county seat of Millard County is Fillmore.

Is there an online parcel map for Millard County?

Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.

Has Millard County's boundary or name changed?

Millard County was created in 1851. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Juab County, Carson County and Sanpete County.

Is my lot in a flood zone?

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

County · code 49027

Millard CountyUtah

Millard County in Utah, with its seat in Fillmore, was created in 1851 by Utah Territory from non-county area in the Pavant Valley. The county is named after Millard Fillmore.

Founded1851
County seatFillmore
Named forMillard Fillmore
Land area6,786 sq mi + 51 sq mi water
Population12,975 2020 Census

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

Updated 20 October 2026

Census outline · seat marked

History

Founded in 1851

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

Millard County was created on October 4, 1851, by Utah Territory from non-county area in the Pavant Valley. Beginning in 1854, Millard County underwent significant boundary changes: it lost territory to the creation of Carson County, then later to Humboldt County and St. Mary's County in 1861, and to Nevada Territory in 1862, while also gaining some land from St. Mary's and Juab counties.

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

1851
Millard County created Millard created by Utah Territory from non-county area in the Pavant Valley. 4 October 1851 · Utah Terr. Laws 1851, 1st sess., pp. 161-162
1854
Lost territory Millard lost to creation of Carson (Utah Territory, extinct); Carson not fully organized, attached to Millard "for election, revenue, and judicial purposes."
to Carson
17 January 1854 · Utah Terr. Laws 1853, 3rd sess., p. 19
1861
Lost territory Millard 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
1862
Gained territory Millard gained from St. Mary's (Utah Territory, extinct), exchanged with Juab, lost to Beaver and Sanpete.
from St. Mary's from Juab from Beaverfrom Sanpete
17 January 1862 · Utah Terr. Laws 1861, 11th sess., sec. 4/p. 47
1896
Became part of Utah Millard 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 13 changes (8 more)

1851
Millard County created Millard created by Utah Territory from non-county area in the Pavant Valley. 4 October 1851 · Utah Terr. Laws 1851, 1st sess., pp. 161-162
1852
Boundary clarified Millard boundaries redefined by Utah Territory. Millard gained from Sanpete and non-county area; Millard included parts of present Utah and Nevada.
with Sanpeteno change
3 March 1852 · Utah Terr. Laws 1851, 1st sess., sec. 10/pp. 163-164
1854
Lost territory Millard lost to creation of Carson (Utah Territory, extinct); Carson not fully organized, attached to Millard "for election, revenue, and judicial purposes."
to Carson
17 January 1854 · Utah Terr. Laws 1853, 3rd sess., p. 19
1855
Changed Carson (Utah Territory, extinct) fully organized; detached from Millard.
Carson
2 October 1855 · History of Nevada, 38
1861
Lost territory Millard 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
1862
Gained territory Millard gained from St. Mary's (Utah Territory, extinct), exchanged with Juab, lost to Beaver and Sanpete.
from St. Mary's from Juab from Beaverfrom Sanpete
17 January 1862 · Utah Terr. Laws 1861, 11th sess., sec. 4/p. 47
1862
Lost territory Millard 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
Gained territory Millard gained from Juab.
from Juab
10 January 1866 · Utah Terr. Laws 1865, 15th sess., ch. 146, sec. 6/p. 208
1866
Lost territory Millard lost to the state of Nevada when Nevada gained from Utah Territory; Millard eliminated from Nevada. 5 May 1866 · U.S. Stat., vol. 14, ch. 73[1866]/p. 43; Van Zandt, 158-159
1888
Lost territory Millard lost to Juab.
to Juab
6 March 1888 · Utah Terr. Laws 1888, 28th sess., ch. 29, pp. 44-46
1896
Became part of Utah Millard 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
1919
Gained territory Millard gained from Juab, exchanged with Sanpete when boundaries were placed on public land survey lines. Boundary with Juab west of the Sevier River was adjusted to run on public land survey lines (no change).
from Juab from Sanpete
8 March 1919 · Utah Laws 1919, 13th sess., ch. 27, p. 49
1921
Exchanged territory Millard exchanged with Sevier.
with Sevier
10 March 1921 · Utah Laws 1921, 14th sess., ch. 33, pp. 104-106

Land and parcels

What the maps cover in Millard

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

Parcels Missing

No public parcel map found for Millard County yet. Lot lines and owners of record are kept by the county (millardcounty.org).
Address points Missing

No public address points layer found for Millard 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

Millard by the Census

Population

12,975 2020 Census count

Housing units

4,907 2020 Census count

Land area

6,786 square miles

Water area

51 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

Millard 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 Millard County.
millardcounty.org

See your own lot on these maps

Open Millard 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.

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Questions

Common questions about Millard County

When was Millard County founded?: Millard County was founded in 1851, and named after Millard Fillmore.
What is the county seat of Millard County?: The county seat of Millard County is Fillmore.
Is there an online parcel map for Millard County?: Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Millard County's boundary or name changed?: Millard County was created in 1851. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Juab County, Carson County and Sanpete County.
Is my lot in a flood zone?: We do not have flood maps for Millard County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby