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County · code 19127

Marshall CountyIowa

Marshall County is a county in Iowa, formed in 1846 and seated in Marshalltown. It is named after John Marshall.

  • Founded1846
  • County seatMarshalltown
  • Named forJohn Marshall
  • Land area573 sq mi + 0.7 sq mi water
  • Population40,105 2020 Census
  • Parcels mapped27,086 checked 14 October 2026
Open the free map Click any parcel in Marshall County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

StoryTama Marshalltown Census outline · seat marked

Where it is

Marshall 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 CountyGrundy 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 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 CountyMarshall County Marshall
Counties of Iowa · Marshall highlighted

History

Formed in 1846 from Linn County

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

Marshall County was created from Linn County on January 13, 1846, while Iowa was still a territory. It was initially attached to Jasper County for election, revenue, and judicial purposes before being fully organized and detached on October 1, 1849. When Iowa became a state on December 28, 1846, Marshall County became an official state county.

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

  1. 1846
    Marshall County created Marshall created by Iowa Territory from Non-County Area 7 attached to Linn; Marshall not fully organized, not attached.
    from Linn
    · Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74
  2. 1846
    Changed Marshall attached to Jasper "for election, revenue, and judicial purposes".
    Jasper
    · Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95
  3. 1846
    Became part of Iowa Marshall became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117
  4. 1849
    Changed Marshall fully organized, detached from Jasper.
    Jasper
    · Swisher, "Organization of Counties," 574-575
  5. 1853
    Changed Hardin attached to Marshall for administrative and judicial purposes.
    Hardin
    · Iowa Acts 1852-1853, ch. 12, sec. 1/p. 28
  6. 1853
    Changed Hardin fully organized, detached from Marshall.
    Hardin
    · Swisher, "Organization of Counties," 575

Land and parcels

What the maps cover in Marshall

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

Marshall by the Census

Population
40,105 2020 Census count
Housing units
16,745 2020 Census count
Land area
573 square miles
Water area
0.7 square miles
People per sq mi
70 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

Marshall 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

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Questions

Common questions about Marshall County

When was Marshall County founded?
Marshall County was founded in 1846, formed from Linn County, and named after John Marshall.
What is the county seat of Marshall County?
The county seat of Marshall County is Marshalltown.
Is there an online parcel map for Marshall County?
Yes. Marshall County publishes a parcel map of 27,086 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Marshall County's boundary or name changed?
Marshall County was created in 1846 from Linn County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Hardin County and Jasper County.
Is my lot in a flood zone?
We do not have flood maps for Marshall 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