What is the county seat of Carroll County?

The county seat of Carroll County is Delphi.

Is there an online parcel map for Carroll County?

Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 21,526 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Carroll County's boundary or name changed?

Carroll County was created in 1828 from Adams County, Hamilton County, Wabash County, Putnam County and Tippecanoe County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Adams County, Howard County and Richardville County.

Is my lot in a flood zone?

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

County · code 18015

Carroll CountyIndiana

Carroll County is a county in Indiana with its seat in Delphi, formed in 1828.

Founded1828
County seatDelphi
Named forCharles Carroll of Carrollton
Land area372 sq mi + 2.8 sq mi water
Population20,306 2020 Census
Parcels mapped21,526 checked 15 October 2026

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

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1828 from Adams County, Hamilton County, Wabash County, Putnam County and Tippecanoe County

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

Carroll County was created on April 1, 1828, from parts of Adams, Hamilton, Wabash, Putnam, and Tippecanoe counties. The county was named after Charles Carroll of Carrollton. Between 1829 and 1845, Carroll County underwent significant boundary adjustments, losing territory to the creation of Cass, St. Joseph, White, and Howard counties.

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

1828
Carroll County created Carroll created from Non-County Area 4, from part of Adams New Purchase attached to Hamilton, and from part of Wabash New Purchase attached to Putnam. Non-County Area 11 attached to Carroll. Part of Adams New Purchase detached from Hamilton, attached to Carroll; and part of Wabash New Purchase detached from Putnam, attached to Carroll. Non-County Area 10 was attached concurrently to Carroll and Tippecanoe. All attachments were for administrative and judicial purposes.
from Adams from Hamilton from Wabash from Putnam from Tippecanoe
1 April 1828 · Ind. Acts 1827, 12th sess., ch. 16/p. 21 and ch. 10, secs. 3, 6/p. 14
1829
Lost territory Carroll lost part of Adams New Purchase attachment, all of Wabash New Purchase attachment, and part of Non-County Area 11 attachment to creation of Cass. Part of Non-County Area 11 was detached from Carroll, became part of Non-County Area 12 attached to Cass. Remaining part of Adams New Purchase was detached from Carroll, attached to Cass. All attachments were for administrative and judical purposes.
to Adams to Wabash to Cass
14 April 1829 · Ind. Acts 1828, 13th sess., ch. 19/p. 26 and ch. 20/p. 28
1830
Lost territory Carroll lost part of Non-County Area 10 (concurrently attached to Carroll and Tippecanoe) to creation of St. Joseph, and to creation of Non-County Area 14, which was attached to St. Joseph for administrative and judicial purposes.
to Tippecanoe to St. Joseph
1 April 1830 · Ind. Acts 1829, 14th sess., ch. 23, secs. 1-2, 7-9, 14/pp. 28-31
1831
Lost territory Carroll lost part of Non-County Area 10 attachment to Non-County Area 14 attached to St. Joseph; remaining Non-County Area 10 was detached from concurrent jurisdiction of Carroll and Tippecanoe and attached to Carroll only. Non-County Area 11 attached to Carroll lost all territory to Non-County Area 10; Non-County Area 11 eliminated.
to St. Joseph to Tippecanoe
1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1834
Lost territory Carroll lost Wabash New Purchase attachment and part of Non-County Area 10 attachment to creation of White.
to Wabash to White
1 April 1834 · Ind. Acts 1833, 18th sess., ch. 30/p. 67

Show all 15 changes (10 more)

1828
Carroll County created Carroll created from Non-County Area 4, from part of Adams New Purchase attached to Hamilton, and from part of Wabash New Purchase attached to Putnam. Non-County Area 11 attached to Carroll. Part of Adams New Purchase detached from Hamilton, attached to Carroll; and part of Wabash New Purchase detached from Putnam, attached to Carroll. Non-County Area 10 was attached concurrently to Carroll and Tippecanoe. All attachments were for administrative and judicial purposes.
from Adams from Hamilton from Wabash from Putnam from Tippecanoe
1 April 1828 · Ind. Acts 1827, 12th sess., ch. 16/p. 21 and ch. 10, secs. 3, 6/p. 14
1829
Lost territory Carroll lost part of Adams New Purchase attachment, all of Wabash New Purchase attachment, and part of Non-County Area 11 attachment to creation of Cass. Part of Non-County Area 11 was detached from Carroll, became part of Non-County Area 12 attached to Cass. Remaining part of Adams New Purchase was detached from Carroll, attached to Cass. All attachments were for administrative and judical purposes.
to Adams to Wabash to Cass
14 April 1829 · Ind. Acts 1828, 13th sess., ch. 19/p. 26 and ch. 20/p. 28
1830
Lost territory Carroll lost part of Non-County Area 10 (concurrently attached to Carroll and Tippecanoe) to creation of St. Joseph, and to creation of Non-County Area 14, which was attached to St. Joseph for administrative and judicial purposes.
to Tippecanoe to St. Joseph
1 April 1830 · Ind. Acts 1829, 14th sess., ch. 23, secs. 1-2, 7-9, 14/pp. 28-31
1830
Changed Wabash New Purchase was detached from Parke and Putnam and attached to Carroll for administrative and judicial purposes.
Wabash Parke Putnam
31 July 1830 · Ind. Acts 1829, 14th sess., ch. 21/p. 26
1831
Lost territory Carroll lost part of Non-County Area 10 attachment to Non-County Area 14 attached to St. Joseph; remaining Non-County Area 10 was detached from concurrent jurisdiction of Carroll and Tippecanoe and attached to Carroll only. Non-County Area 11 attached to Carroll lost all territory to Non-County Area 10; Non-County Area 11 eliminated.
to St. Joseph to Tippecanoe
1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1834
Lost territory Carroll lost Wabash New Purchase attachment and part of Non-County Area 10 attachment to creation of White.
to Wabash to White
1 April 1834 · Ind. Acts 1833, 18th sess., ch. 30/p. 67
1834
Lost territory Carroll lost all of Non-County Area 10 attachment to Non-County Area 17 attached to White; Non-County Area 10 eliminated.
to White
24 December 1834 · Ind. Acts 1834, 19th sess., gen., ch. 57/p. 77
1837
Lost territory Carroll lost to White; mistake in description corrected 14 February 1839.
to White
4 February 1837 · Ind. Acts 1836, 21st sess., loc., ch. 170/p. 379
1839
Boundary clarified Boundary between Carroll and White was redefined, correcting mistake of 4 February 1837 (no change).
with Whiteno change
14 February 1839 · Ind. Acts 1838, 23d sess., gen., ch. 95/p. 93
1839
Changed Part of Adams New Purchase (Great Miami Reservation) was attached to Carroll for administrative and judicial purposes.
Adams
16 February 1839 · Ind. Acts 1838, 23d sess., gen., ch. 63/p. 75
1842
Boundary clarified Carroll boundaries were redefined, creating an overlap with White, but change never took effect; corrected 13 January 1846.
with Whiteno change
5 December 1842 · Ind. Rev. Stat. 1843, ch. 2, secs. 2, 26, 28-31, 36-37, 42-44, 61, 67, 77, 80-82, 85-86/pp. 68, 74-81, 84, 86, 88-89
1844
Lost territory Carroll lost most of Adams New Purchase attachment to creation of Richardville (now Howard); Richardville not fully organized, part attached to Carroll for administrative and judicial purposes. A one-mile-wide remnant of Adams New Purchase between Carroll and Richardville remained attached to Carroll.
to Adams to Richardvilleto Howard
15 January 1844 · Ind. Acts 1843, 28th sess., gen., ch. 3, secs. 1-2, 6/pp. 10-11
1844
Changed Richardville (now Howard) fully organized, detached from Carroll.
RichardvilleHoward
1 May 1844 · Ind. Acts 1843, 28th sess., gen., ch. 3, sec. 6/p. 11
1845
Lost territory Carroll lost Adams New Purchase attachment to Richardville (now Howard), mistakes in description corrected 13 January 1846.
to Adams to Richardvilleto Howard
13 January 1845 · Ind. Acts 1844, 29th sess., loc., ch. 126/p. 151
1846
Boundary clarified Carroll boundaries were redefined, correcting mistake of 5 December 1842 and implicitly clarifying the boundary with White. Boundary between Carroll and Richardville (now Howard) was redefined, correcting mistakes of 13 January 1845 (no change).
with White with Richardvillewith Howardno change
13 January 1846 · Ind. Acts 1845, 30th sess., loc., chs. 237, 246/pp. 260, 264

Land and parcels

What the maps cover in Carroll

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

Parcels Good enough

Lot lines and tax-map numbers for 21,526 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, 11,044 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

Carroll by the Census

Population

20,306 2020 Census count

Housing units

9,483 2020 Census count

Land area

372 square miles

Water area

2.8 square miles

People per sq mi

55 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

Carroll 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 Carroll County.
carrollcountyindiana.com

See your own lot on these maps

Open Carroll 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 Carroll County

When was Carroll County founded?: Carroll County was founded in 1828, formed from Adams County, Hamilton County, Wabash County, Putnam County and Tippecanoe County, and named after Charles Carroll of Carrollton.
What is the county seat of Carroll County?: The county seat of Carroll County is Delphi.
Is there an online parcel map for Carroll County?: Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 21,526 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Carroll County's boundary or name changed?: Carroll County was created in 1828 from Adams County, Hamilton County, Wabash County, Putnam County and Tippecanoe County. Since then the Atlas of Historical County Boundaries records 11 later changes, chiefly involving Adams County, Howard County and Richardville County.
Is my lot in a flood zone?: We do not have flood maps for Carroll County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby