When was Allen County founded?

Allen County was founded in 1824, formed from Delaware County and Adams County, and named after John Allen.

What is the county seat of Allen County?

The county seat of Allen County is Fort Wayne.

Is there an online parcel map for Allen County?

Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 164,126 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Allen County's boundary or name changed?

Allen County was created in 1824 from Delaware County and Adams County. Since then the Atlas of Historical County Boundaries records 13 later changes, chiefly involving Adams County, Huntington County and De Kalb County.

Is my lot in a flood zone?

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

County · code 18003

Allen CountyIndiana

Allen County is in Indiana and has its seat in Fort Wayne. The county was formed in 1824 from Delaware and Adams counties.

Founded1824
County seatFort Wayne
Named forJohn Allen
Land area657 sq mi + 2.7 sq mi water
Population385,410 2020 Census
Parcels mapped164,126 checked 15 October 2026

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

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1824 from Delaware County and Adams County

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

Allen County was created on April 1, 1824, from Delaware and Adams counties and non-county areas. From 1828 to 1836, Allen County lost territory to the creation of Carroll, Cass, Elkhart, Grant, Huntington, Lagrange, Wells, De Kalb, Whitley, and Noble counties.

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

1824
Allen County created Allen created from Delaware New Purchase (later Adams New Purchase) and from Non-County Area 4. Non-County Areas 8 and 9, and part of Delaware New Purchase were attached to Allen for administrative and judicial purposes.
from Delaware from Adams
1 April 1824 · Ind. Rev. Laws 1824, ch. 18, secs. 1, 8/pp. 109-110
1828
Gained territory Non-County Area 8 gained from Non-County Area 4 and remained attached to Allen for administrative and judicial purposes. 24 January 1828 · Ind. Acts 1827, 12th sess., ch. 10/p. 13
1828
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Non-County Area 11, which was attached to Carroll for administrative and judicial purposes.
to Carroll
1 April 1828 · Ind. Acts 1827, 12th sess., ch. 16/p. 21 and ch. 10, secs. 3, 6/p. 14
1829
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Non-County Area 12, which was attached to Cass for administrative and judicial purposes.
to Cass
14 April 1829 · Ind. Acts 1828, 13th sess., ch. 19/p. 26 and ch. 20/p. 28
1830
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Elkhart and to creation of Non-County Area 13, which was attached to Elkhart for administrative and judicial purposes.
to Elkhart
1 April 1830 · Ind. Acts 1829, 14th sess., ch. 23, secs. 1-2, 7-9, 14/pp. 28-31

Show all 14 changes (9 more)

1824
Allen County created Allen created from Delaware New Purchase (later Adams New Purchase) and from Non-County Area 4. Non-County Areas 8 and 9, and part of Delaware New Purchase were attached to Allen for administrative and judicial purposes.
from Delaware from Adams
1 April 1824 · Ind. Rev. Laws 1824, ch. 18, secs. 1, 8/pp. 109-110
1828
Gained territory Non-County Area 8 gained from Non-County Area 4 and remained attached to Allen for administrative and judicial purposes. 24 January 1828 · Ind. Acts 1827, 12th sess., ch. 10/p. 13
1828
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Non-County Area 11, which was attached to Carroll for administrative and judicial purposes.
to Carroll
1 April 1828 · Ind. Acts 1827, 12th sess., ch. 16/p. 21 and ch. 10, secs. 3, 6/p. 14
1829
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Non-County Area 12, which was attached to Cass for administrative and judicial purposes.
to Cass
14 April 1829 · Ind. Acts 1828, 13th sess., ch. 19/p. 26 and ch. 20/p. 28
1830
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Elkhart and to creation of Non-County Area 13, which was attached to Elkhart for administrative and judicial purposes.
to Elkhart
1 April 1830 · Ind. Acts 1829, 14th sess., ch. 23, secs. 1-2, 7-9, 14/pp. 28-31
1831
Exchanged territory Part of Adams New Purchase was detached from Allen and attached to Grant. Non-County Area 8 attached to Allen exchanged with Non-County Area 13 attached to Elkhart, lost to creation of Non-County Area 15 attached to Grant.
with Adams with Grant with Elkhart
1 April 1831 · Ind. Acts 1830, 15th sess., spec., ch. 12, secs. 1-2, 7-8/pp. 16-18
1832
Lost territory Allen lost part of Adams New Purchase attachment and part of Non-County Area 8 attachment to creation of Huntington; Huntington not fully organized, part attached to Allen for administrative and judicial purposes.
to Adams to Huntington
2 February 1832 · Ind. Acts 1831, 16th sess., ch. 119, secs. 1-2/pp. 112-113
1832
Lost territory Allen lost part of Non-County Area 8 attachment to creation of Lagrange and to creation of Non-County Area 16 attached to Lagrange.
to Lagrange
1 April 1832 · Ind. Acts 1831, 16th sess., ch. 117, secs. 1-2, 7/pp. 110-111
1834
Changed Huntington fully organized, detached from Allen.
Huntington
1 February 1834 · Ind. Acts 1833, 18th sess., ch. 29/p. 65
1835
Lost territory Allen lost part of Adams New Purchase attachment and all of Non-County Area 9 attachment to creation of Adams. Allen lost remaining Adams New Purchase attachment to creation of Wells; Allen lost part of Non-County Area 8 attachment to creation of De Kalb and Whitley. New counties not fully organized, parts attached to Allen for administrative and judicial purposes.
to Adams to Wells to De Kalbto Whitley
7 February 1835 · Ind. Acts 1834, 19th sess., gen., ch. 25, secs. 1, 2, 4,6/pp. 44-45
1835
Lost territory Allen lost all of Non-County Area 8 attachment to creation of Noble; Noble not fully organized, part attached to Allen for administrative and judicial purposes.
to Noble
1 June 1835 · Ind. Acts 1834, 19th sess., gen., ch. 24/p. 43
1836
Changed Whitley was detached from Allen 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 Adams and Noble fully organized, detached from Allen.
Adams Noble
1 March 1836 · Ind. Acts 1835, 20th sess., gen., ch. 14, 20/pp. 46, 54
1837
Changed De Kalb and Wells fully organized, detached from Allen.
De KalbWells
1 May 1837 · Ind. Acts 1836, 21st sess., gen., ch. 5, 6/pp. 57, 59

Land and parcels

What the maps cover in Allen

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

Parcels Good enough

Lot lines and tax-map numbers for 164,126 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, 184,338 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

Allen by the Census

Population

385,410 2020 Census count

Housing units

162,431 2020 Census count

Land area

657 square miles

Water area

2.7 square miles

People per sq mi

586 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

Allen 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 Allen County.
co.allen.in.us

See your own lot on these maps

Open Allen 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 Allen County

When was Allen County founded?: Allen County was founded in 1824, formed from Delaware County and Adams County, and named after John Allen.
What is the county seat of Allen County?: The county seat of Allen County is Fort Wayne.
Is there an online parcel map for Allen County?: Yes. Indiana Geographic Information Office (IndianaMap) publishes a parcel map of 164,126 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Allen County's boundary or name changed?: Allen County was created in 1824 from Delaware County and Adams County. Since then the Atlas of Historical County Boundaries records 13 later changes, chiefly involving Adams County, Huntington County and De Kalb County.
Is my lot in a flood zone?: We do not have flood maps for Allen County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby