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County · code 19189

Winnebago CountyIowa

Winnebago County is a county in Iowa with its seat in Forest City. It was created in 1851 from Polk County and named after the Ho-Chunk people.

  • Founded1851
  • County seatForest City
  • Named forHo-Chunk
  • Land area400 sq mi + 1.2 sq mi water
  • Population10,679 2020 Census
  • Parcels mapped12,416 checked 16 October 2026
Open the free map Click any parcel in Winnebago County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Kossuth Forest City Census outline · seat marked

Where it is

Winnebago on the map of Iowa

Iowa has 99 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Iowa · Winnebago highlighted

History

Formed in 1851 from Polk County

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

Winnebago County was created from Non-County Area 9 and initially attached to Polk County, but was not fully organized. In 1853 it was attached to Boone County for administrative and judicial purposes, then in 1855 detached from Boone and attached to Webster County for election, judicial, and revenue purposes. Winnebago County was fully organized and detached from Webster County on November 1, 1857.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1851
    Winnebago County created Winnebago created from Non-County Area 9 attached to Polk; Winnebago not fully organized, not attached.
    from Polk
    · Iowa Acts 1850-1851, ch. 9, sec. 45/p. 37
  2. 1853
    Changed Winnebago attached to Boone for administrative and judicial purposes.
    Boone
    · Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28
  3. 1855
    Changed Winnebago detached from Boone, attached to Webster "for election, judicial, and revenue purposes."
    BooneWebster
    · Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211
  4. 1857
    Changed Winnebago fully organized, detached from Webster.
    Webster
    · Swisher, "Organization of Counties," 559-560, 576

Land and parcels

What the maps cover in Winnebago

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

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

Winnebago by the Census

Population
10,679 2020 Census count
Housing units
5,077 2020 Census count
Land area
400 square miles
Water area
1.2 square miles
People per sq mi
27 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

Winnebago County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Winnebago 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 Winnebago County

When was Winnebago County founded?
Winnebago County was founded in 1851, formed from Polk County, and named after Ho-Chunk.
What is the county seat of Winnebago County?
The county seat of Winnebago County is Forest City.
Is there an online parcel map for Winnebago County?
Yes. Winnebago County publishes a parcel map of 12,416 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Winnebago County's boundary or name changed?
Winnebago County was created in 1851 from Polk County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Boone County and Webster County.
Is my lot in a flood zone?
We do not have flood maps for Winnebago County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door