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County · code 19149

Plymouth CountyIowa

Plymouth County is a county in Iowa, with its seat in Le Mars. It was created on January 15, 1851, from land formerly part of Polk County.

  • Founded1851
  • County seatLe Mars
  • Named forPlymouth, Massachusetts
  • Land area863 sq mi + 0.8 sq mi water
  • Population25,698 2020 Census
  • Parcels mapped29,915 checked 15 October 2026
Open the free map Click any parcel in Plymouth County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

SiouxWoodburyUnion, SDCherokee Le Mars Census outline · seat marked

Where it is

Plymouth 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 CountyMarshall CountyMills CountyMitchell CountyMonona CountyMonroe CountyMontgomery CountyMuscatine CountyO'Brien CountyOsceola CountyPage CountyPalo Alto 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 CountyPlymouth County Plymouth
Counties of Iowa · Plymouth 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.

When Plymouth County was created in 1851, it was not fully organized and was attached to Polk County. In 1853 it was attached to Woodbury County for revenue, election, and judicial purposes, but by 1858 it became fully organized and detached from Woodbury. After being reattached to Woodbury for judicial purposes in 1868, Plymouth County was again fully organized and permanently detached in 1870.

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

  1. 1851
    Plymouth County created Plymouth created from Non-County Area 9 attached to Polk; Plymouth not fully organized, not attached.
    from Polk
    · Iowa Acts 1850-1851, ch. 9, sec. 32/p. 35
  2. 1853
    Changed Plymouth attached to Woodbury "for revenue, election, and judicial purposes".
    Woodbury
    · Iowa Acts 1852-1853, ch. 8, sec. 14/p. 24
  3. 1858
    Changed Plymouth fully organized, detached from Woodbury.
    Woodbury
    · Swisher, "Organization of Counties," 576
  4. 1868
    Changed Plymouth reattached to Woodbury "for judicial purposes."
    Woodbury
    · Iowa Acts 1868, ch. 73, secs. 2, 8/pp. 99-100
  5. 1870
    Changed Plymouth fully organized, detached from Woodbury when judicial attachments of 7 April 1868 were repealed.
    Woodbury
    · Iowa Acts 1870, ch. 2, secs. 3-4/pp. 3-4

Land and parcels

What the maps cover in Plymouth

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

Plymouth by the Census

Population
25,698 2020 Census count
Housing units
10,818 2020 Census count
Land area
863 square miles
Water area
0.8 square miles
People per sq mi
30 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

Plymouth 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 Plymouth 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 Plymouth County

When was Plymouth County founded?
Plymouth County was founded in 1851, formed from Polk County, and named after Plymouth, Massachusetts.
What is the county seat of Plymouth County?
The county seat of Plymouth County is Le Mars.
Is there an online parcel map for Plymouth County?
Yes. Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa) publishes a parcel map of 29,915 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Plymouth County's boundary or name changed?
Plymouth County was created in 1851 from Polk County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Woodbury County.
Is my lot in a flood zone?
We do not have flood maps for Plymouth 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