When was Warren County founded?

Warren County was founded in 1827, formed from Wabash County and Fountain County, and named after Joseph Warren.

What is the county seat of Warren County?

The county seat of Warren County is Williamsport.

Is there an online parcel map for Warren County?

Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 10,811 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Warren County's boundary or name changed?

Warren County was created in 1827 from Wabash County and Fountain County. Since then the Atlas of Historical County Boundaries records 8 later changes, chiefly involving Wabash County, White County and Jasper County.

Who issues septic and well permits in Warren County?

The county's page on septic systems and wells: Health and Wellness List.

Is my lot in a flood zone?

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

County · code 18171

Warren CountyIndiana

Warren County is a county in Indiana with its seat in Williamsport, formed in 1827.

Founded1827
County seatWilliamsport
Named forJoseph Warren
Land area365 sq mi + 1.7 sq mi water
Population8,440 2020 Census
Parcels mapped10,811 checked 15 October 2026

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

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1827 from Wabash County and Fountain County

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

Warren County was created in 1827 from parts of Wabash and Fountain Counties. The county was named after Joseph Warren. Jasper County was created from Warren in 1835, and Newton County was eliminated in 1839, both affecting Warren's boundaries.

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

1827
Warren County created Warren created from part of Wabash New Purchase attached to Fountain.
from Wabash from Fountain
1 March 1827 · Ind. Acts 1826, 11th sess., ch. 11/p. 14
1834
Lost territory Warren lost part of Non-County Area 4 attachment to creation of Non-County Area 17, which was attached to White. Part of Wabash New Purchase was detached from Warren, attached to White. All attachments were for administrative and judicial purposes.
to White to Wabash
1 April 1834 · Ind. Acts 1833, 18th sess., ch. 30/p. 67
1834
Lost territory Warren lost part of Non-County Area 4 attachment to Non-County Area 17 attached to White for administrative and judicial purposes.
to White
24 December 1834 · Ind. Acts 1834, 19th sess., gen., ch. 57/p. 77
1835
Gained territory Non-County Area 4 attached to Warren gained from Non-County Area 17 attached to White. Part of Wabash New Purchase was detached from White and attached to Warren for administrative and judicial purposes.
from White from Wabash
31 January 1835 · Ind. Acts 1834, 19th sess., gen., ch. 69/p. 86
1835
Lost territory Warren lost part of Wabash New Purchase attachment to creation of Jasper; Warren lost all of Non-County Area 4 attachment to creation of Jasper and Newton; Jasper and Newton not fully organized, parts attached to Warren for administrative and judicial purposes.
to Wabash to Jasper to Newton
7 February 1835 · Ind. Acts 1834, 19th sess., gen., ch. 25, secs. 12, 13/p. 46

Show all 10 changes (5 more)

1827
Warren County created Warren created from part of Wabash New Purchase attached to Fountain.
from Wabash from Fountain
1 March 1827 · Ind. Acts 1826, 11th sess., ch. 11/p. 14
1830
Changed Wabash New Purchase was detached from Fountain and attached to Warren for administrative and judicial purposes.
Wabash Fountain
31 July 1830 · Ind. Acts 1829, 14th sess., ch. 21/p. 26
1831
Changed Non-County Area 4 was attached to Warren for administrative and judicial purposes. 1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1833
Boundary clarified Boundary between Warren and Vermillion was clarified (no change).
with Vermillionno change
15 January 1833 · Ind. Acts 1832, 17th sess., ch. 10/p. 13; Pence and Armstrong, 59-61
1834
Lost territory Warren lost part of Non-County Area 4 attachment to creation of Non-County Area 17, which was attached to White. Part of Wabash New Purchase was detached from Warren, attached to White. All attachments were for administrative and judicial purposes.
to White to Wabash
1 April 1834 · Ind. Acts 1833, 18th sess., ch. 30/p. 67
1834
Lost territory Warren lost part of Non-County Area 4 attachment to Non-County Area 17 attached to White for administrative and judicial purposes.
to White
24 December 1834 · Ind. Acts 1834, 19th sess., gen., ch. 57/p. 77
1835
Gained territory Non-County Area 4 attached to Warren gained from Non-County Area 17 attached to White. Part of Wabash New Purchase was detached from White and attached to Warren for administrative and judicial purposes.
from White from Wabash
31 January 1835 · Ind. Acts 1834, 19th sess., gen., ch. 69/p. 86
1835
Lost territory Warren lost part of Wabash New Purchase attachment to creation of Jasper; Warren lost all of Non-County Area 4 attachment to creation of Jasper and Newton; Jasper and Newton not fully organized, parts attached to Warren for administrative and judicial purposes.
to Wabash to Jasper to Newton
7 February 1835 · Ind. Acts 1834, 19th sess., gen., ch. 25, secs. 12, 13/p. 46
1838
Changed Jasper fully organized, detached from Warren..
Jasper
15 March 1838 · Ind. Acts 1837, 22d sess., loc., ch. 64/p. 268
1839
Lost territory Warren lost Newton attachment when Newton was eliminated.
to Newton
3 June 1839 · Ind. Acts 1838, 23d sess., gen., ch. 74/p. 83; Pence and Armstrong, 474

Land and parcels

What the maps cover in Warren

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

Parcels Good enough

Lot lines and tax-map numbers for 10,811 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, 4,615 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

Warren by the Census

Population

8,440 2020 Census count

Housing units

3,659 2020 Census count

Land area

365 square miles

Water area

1.7 square miles

People per sq mi

23 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 recordsfrom warrencounty.in.gov · checked 13 October 2026
Clerk of court: deeds and platsfrom warrencounty.in.gov · checked 13 October 2026

Permits

Health department: septic and well
Hospital/Health Care
from warrencounty.in.gov · checked 13 October 2026

Zoning and code

Planning and zoningfrom warrencounty.in.gov · checked 13 October 2026
Warren County Area Plan & Zoning Officefrom warrencounty.in.gov
Zoning ordinancefrom warrencounty.in.gov

County government

County government
The official website of Warren County.
warrencounty.in.gov

See your own lot on these maps

Open Warren 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 Warren County

When was Warren County founded?: Warren County was founded in 1827, formed from Wabash County and Fountain County, and named after Joseph Warren.
What is the county seat of Warren County?: The county seat of Warren County is Williamsport.
Is there an online parcel map for Warren County?: Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 10,811 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Warren County's boundary or name changed?: Warren County was created in 1827 from Wabash County and Fountain County. Since then the Atlas of Historical County Boundaries records 8 later changes, chiefly involving Wabash County, White County and Jasper County.
Who issues septic and well permits in Warren County?: The county's page on septic systems and wells: Health and Wellness List.
Is my lot in a flood zone?: We do not have flood maps for Warren County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby