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County · code 19075

Grundy CountyIowa

Grundy County is a county in Iowa, with its seat in Grundy Center. It was created on January 15, 1851, and named after Felix Grundy.

  • Founded1851
  • County seatGrundy Center
  • Named forFelix Grundy
  • Land area502 sq mi
  • Population12,329 2020 Census
  • Parcels mapped10,574 checked 15 October 2026
Open the free map Click any parcel in Grundy County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ButlerHardinBlack Hawk Grundy Center Census outline · seat marked

Where it is

Grundy on the map of Iowa

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

Adair CountyAdams CountyAllamakee CountyAppanoose CountyAudubon CountyBenton CountyBlack Hawk CountyBoone CountyBremer CountyBuchanan CountyBuena Vista CountyButler CountyCalhoun CountyCarroll CountyCass CountyCedar CountyCerro Gordo CountyCherokee CountyChickasaw CountyClarke CountyClay CountyClayton CountyClinton CountyCrawford CountyDallas CountyDavis CountyDecatur CountyDelaware CountyDes Moines CountyDickinson CountyDubuque CountyEmmet CountyFayette CountyFloyd CountyFranklin CountyFremont CountyGreene CountyGuthrie CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHoward CountyHumboldt CountyIda CountyIowa CountyJackson CountyJasper CountyJefferson CountyJohnson CountyJones CountyKeokuk CountyKossuth CountyLee CountyLinn CountyLouisa CountyLucas CountyLyon CountyMadison CountyMahaska CountyMarion CountyMarshall CountyMills CountyMitchell CountyMonona CountyMonroe CountyMontgomery CountyMuscatine CountyO'Brien CountyOsceola CountyPage CountyPalo Alto CountyPlymouth CountyPocahontas CountyPolk CountyPottawattamie CountyPoweshiek CountyRinggold CountySac CountyScott CountyShelby CountySioux CountyStory CountyTama CountyTaylor CountyUnion CountyVan Buren CountyWapello CountyWarren CountyWashington CountyWayne CountyWebster CountyWinnebago CountyWinneshiek CountyWoodbury CountyWorth CountyWright CountyGrundy County Grundy
Counties of Iowa · Grundy highlighted

History

Formed in 1851 from Delaware County

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

Grundy County was created from Non-County Area 6 attached to Delaware on January 15, 1851, but was not fully organized at that time. It was initially attached to Buchanan County for judicial, elective, and revenue purposes in February 1851, then transferred to Black Hawk County in January 1853. Grundy County was fully organized and detached from Black Hawk on December 25, 1856.

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

  1. 1851
    Grundy County created Grundy created from Non-County Area 6 attached to Delaware; Grundy not fully organized, not attached.
    from Delaware
    · Iowa Acts 1850-1851, ch. 9, sec. 10/p. 29
  2. 1851
    Changed Grundy attached to Buchanan "for judicial, elective, and revenue purposes."
    Buchanan
    · Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227
  3. 1853
    Changed Grundy detached from Buchanan, attached to Black Hawk "for judicial, elective, and revenue purposes" (but Grundy remained indirectly attached to Buchanan, through Black Hawk, until 17 August 1853)
    BuchananBlack Hawk
    · Iowa Acts 1852-1853, ch. 50, sec. 5/pp. 85-86
  4. 1856
    Changed Grundy fully organized, detached from Black Hawk.
    Black Hawk
    · Swisher, "Organization of Counties," 575

Land and parcels

What the maps cover in Grundy

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

Grundy by the Census

Population
12,329 2020 Census count
Housing units
5,465 2020 Census count
Land area
502 square miles
Water area
0 square miles
People per sq mi
25 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.

Zoning and code

  • Zoningfrom grundycountyiowa.gov

County government

See your own lot on these maps

Open Grundy 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 Grundy County

When was Grundy County founded?
Grundy County was founded in 1851, formed from Delaware County, and named after Felix Grundy.
What is the county seat of Grundy County?
The county seat of Grundy County is Grundy Center.
Is there an online parcel map for Grundy County?
Yes. A public source publishes a parcel map of 10,574 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Grundy County's boundary or name changed?
Grundy County was created in 1851 from Delaware County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Black Hawk County and Buchanan County.
Is my lot in a flood zone?
We do not have flood maps for Grundy 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