What is the county seat of Grant County?

The county seat of Grant County is Marion.

Is there an online parcel map for Grant County?

Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 37,808 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Grant County's boundary or name changed?

Grant County was created in 1831 from Madison County, Adams County, Cass County, Delaware County and Allen County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Huntington County, Wabash County and Kosciusko County.

Who issues building permits in Grant County?

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

Is my lot in a flood zone?

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

County · code 18053

Grant CountyIndiana

Grant County is a county in Indiana, formed in 1831 with Marion as its county seat.

Founded1831
County seatMarion
Named forSamuel Grant and Moses Grant
Land area414 sq mi + 0.8 sq mi water
Population66,674 2020 Census
Parcels mapped37,808 checked 15 October 2026

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

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1831 from Madison County, Adams County, Cass County, Delaware County and Allen County

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

Grant County was created on April 1, 1831, from Madison County, from the unattached part of Adams New Purchase, and from parts of Adams New Purchase attached to Cass and Delaware. The county was named after Samuel Grant and Moses Grant. In 1832, Grant lost the Adams New Purchase attachment and part of its non-county area to the creation of Huntington and Wabash counties, though parts of those new counties were temporarily attached to Grant for administrative and judicial purposes. By 1838, Grant had lost territory to Madison County and to Wabash County, settling into its present form.

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

1831
Grant County created Grant created from Madison, from the unattached part of Adams New Purchase, and from parts of Adams New Purchase attached to Cass and Delaware. Non-County Area 15 was attached to Grant. A small piece of unattached Adams New Purchase located between Allen and Cass was attached to Grant. Parts of Adams New Purchase were detached from Allen and Cass, attached to Grant. All attachments were for administrative and judicial purposes.
from Madison from Adams from Cass from Delaware from Allen
1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1832
Lost territory Grant lost Adams New Purchase attachment and part of Non-County Area 15 attachment to creation of Huntington and Wabash; Huntington and Wabash not fully organized, parts attached to Grant for administrative and judicial purposes.
to Adams to Huntington to Wabash
2 February 1832 · Ind. Acts 1831, 16th sess., ch. 119, secs. 1-2/pp. 112-113
1834
Changed Huntington fully organized, detached from Grant.
Huntington
1 February 1834 · Ind. Acts 1833, 18th sess., ch. 29/p. 65
1835
Lost territory Grant lost part of Non-County Area 15 attachment to creation of Kosciusko and Whitley; Kosciusko and Whitley not fully organized, parts attached to Grant for administrative and judicial purposes.
to Kosciusko to Whitley
7 February 1835 · Ind. Acts 1834, 19th sess., gen., ch. 25, sec. 7/p. 45
1838
Lost territory Grant lost to Madison; Grant lost all of Non-County Area 15 attachment to Wabash.
to Madison to Wabash
17 February 1838 · Ind. Acts 1837, 22d sess., loc., ch. 61, secs. 41, 48, 50, 52, 64-66, 70-71, 75-78/pp. 241-266; Pence and Armstrong, 406

Show all 8 changes (3 more)

1831
Grant County created Grant created from Madison, from the unattached part of Adams New Purchase, and from parts of Adams New Purchase attached to Cass and Delaware. Non-County Area 15 was attached to Grant. A small piece of unattached Adams New Purchase located between Allen and Cass was attached to Grant. Parts of Adams New Purchase were detached from Allen and Cass, attached to Grant. All attachments were for administrative and judicial purposes.
from Madison from Adams from Cass from Delaware from Allen
1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1832
Lost territory Grant lost Adams New Purchase attachment and part of Non-County Area 15 attachment to creation of Huntington and Wabash; Huntington and Wabash not fully organized, parts attached to Grant for administrative and judicial purposes.
to Adams to Huntington to Wabash
2 February 1832 · Ind. Acts 1831, 16th sess., ch. 119, secs. 1-2/pp. 112-113
1834
Changed Huntington fully organized, detached from Grant.
Huntington
1 February 1834 · Ind. Acts 1833, 18th sess., ch. 29/p. 65
1835
Lost territory Grant lost part of Non-County Area 15 attachment to creation of Kosciusko and Whitley; Kosciusko and Whitley not fully organized, parts attached to Grant for administrative and judicial purposes.
to Kosciusko to Whitley
7 February 1835 · Ind. Acts 1834, 19th sess., gen., ch. 25, sec. 7/p. 45
1835
Changed Wabash fully organized, detached from Grant.
Wabash
1 March 1835 · Ind. Acts 1834, 19th sess., gen., ch. 23/p. 42
1836
Changed Whitley was detached from Grant and attached to Huntington for administrative and judicial purposes.
Whitley Huntington
6 February 1836 · Ind. Acts 1835, 20th sess., gen., ch. 55/p. 84
1836
Changed Kosciusko fully organized, detached from Grant.
Kosciusko
1 June 1836 · Ind. Acts 1835, 20th sess., gen., ch. 21, sec. 1/p. 55
1838
Lost territory Grant lost to Madison; Grant lost all of Non-County Area 15 attachment to Wabash.
to Madison to Wabash
17 February 1838 · Ind. Acts 1837, 22d sess., loc., ch. 61, secs. 41, 48, 50, 52, 64-66, 70-71, 75-78/pp. 241-266; Pence and Armstrong, 406

Land and parcels

What the maps cover in Grant

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

Parcels Good enough

Lot lines and tax-map numbers for 37,808 parcels from Indiana Geographic Information Office (IndianaMap). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 6 October 2026 · checked 15 October 2026
Address points Official

One point per address, 48,685 in all from Indiana Geographic Information Office (IGIO).
edited 8 March 2026 · checked 13 October 2026
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

Grant by the Census

Population

66,674 2020 Census count

Housing units

29,810 2020 Census count

Land area

414 square miles

Water area

0.8 square miles

People per sq mi

161 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.

Permits

Permit Listfrom areaplan.grantcounty27.us

Zoning and code

Board of Zoning Appeals Rules & Proceduresfrom in.gov

County government

County government
The official website of Grant County.
grantcounty.net

See your own lot on these maps

Open Grant 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 Grant County

When was Grant County founded?: Grant County was founded in 1831, formed from Madison County, Adams County, Cass County, Delaware County and Allen County, and named after Samuel Grant and Moses Grant.
What is the county seat of Grant County?: The county seat of Grant County is Marion.
Is there an online parcel map for Grant County?: Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 37,808 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Grant County's boundary or name changed?: Grant County was created in 1831 from Madison County, Adams County, Cass County, Delaware County and Allen County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Huntington County, Wabash County and Kosciusko County.
Who issues building permits in Grant County?: The county's page on building permits: Permit List. Inside a city or town, ask that city first.
Is my lot in a flood zone?: We do not have flood maps for Grant County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby