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County · code 19011

Benton CountyIowa

Benton County is in Iowa and has its county seat in Vinton. The county was created on December 21, 1837, and is named after Thomas Hart Benton.

  • Founded1837
  • County seatVinton
  • Named forThomas Hart Benton
  • Land area716 sq mi + 2.3 sq mi water
  • Population25,575 2020 Census
  • Parcels mapped17,744 checked 15 October 2026
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Updated

IowaBuchananLinnTama Vinton Census outline · seat marked

Where it is

Benton 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 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 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 CountyBenton County Benton
Counties of Iowa · Benton highlighted

History

Formed in 1837 from Dubuque County and Jackson County

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

Benton County was created by Wisconsin Territory from Dubuque County on December 21, 1837, but was not fully organized and was temporarily attached to Jackson County. When Iowa Territory was created from Wisconsin Territory on July 3, 1838, Benton became part of the territory, and was later fully organized on March 1, 1846. Benton became an Iowa county when the state of Iowa was created from Iowa Territory on December 28, 1846.

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

  1. 1837
    Benton County created Benton created by Wisconsin Territory from Dubuque; Benton not fully organized, attached to Jackson "for temporary purposes."
    from Dubuquefrom Jackson
    · Wis. Terr. Laws 1837, no. 6, secs. 10-11/p. 135
  2. 1838
    Became part of Iowa Benton became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. · U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241
  3. 1840
    Changed Benton detached from Jackson, attached to Linn "for judicial, election, and revenue purposes."
    JacksonLinn
    · Iowa Terr. Laws 1840-1841, ch. 3, sec. 1/p. 4
  4. 1843
    Lost territory Benton lost to creation of Tama and Non-County Area 7; Benton remained attached to Linn.
    to Tamato Linn
    · Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 10/pp. 133-134
  5. 1846
    Became part of Iowa Benton became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117
Show all 9 changes (4 more)
  1. 1837
    Benton County created Benton created by Wisconsin Territory from Dubuque; Benton not fully organized, attached to Jackson "for temporary purposes."
    from Dubuquefrom Jackson
    · Wis. Terr. Laws 1837, no. 6, secs. 10-11/p. 135
  2. 1838
    Became part of Iowa Benton became an Iowa Territory county when Iowa Territory was created from Wisconsin Territory. · U.S. Stat., vol. 5, ch. 96[1838]/pp. 235-241
  3. 1840
    Changed Benton detached from Jackson, attached to Linn "for judicial, election, and revenue purposes."
    JacksonLinn
    · Iowa Terr. Laws 1840-1841, ch. 3, sec. 1/p. 4
  4. 1843
    Lost territory Benton lost to creation of Tama and Non-County Area 7; Benton remained attached to Linn.
    to Tamato Linn
    · Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 10/pp. 133-134
  5. 1846
    Changed Benton fully organized, detached from Linn; Black Hawk detached from Delaware, attached to Benton "for election, judicial, and revenue purposes"; Tama detached from Linn, attached to Benton "for election, revenue, and judicial purposes."
    LinnBlack HawkDelawareTama
    · Iowa Terr. Laws 1845-1846, ch. 96, secs. 1, 11, 18/pp. 86-88
  6. 1846
    Became part of Iowa Benton became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117
  7. 1851
    Changed Black Hawk detached from Benton, attached to Buchanan "for judicial, elective, and revenue purposes".
    Black HawkBuchanan
    · Iowa Acts 1850-1851, ch. 95, secs. 1-2/p. 227
  8. 1853
    Changed Tama fully organized, detached from Benton.
    Tama
    · Swisher, "Organization of Counties," 576
  9. 1858
    Changed Boundary between Benton and Tama confirmed (no change).
    Tama
    · Iowa Acts 1858, ch. 123, sec. 1/pp. 240-241

Land and parcels

What the maps cover in Benton

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

Benton by the Census

Population
25,575 2020 Census count
Housing units
11,076 2020 Census count
Land area
716 square miles
Water area
2.3 square miles
People per sq mi
36 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

Benton 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 Benton County

When was Benton County founded?
Benton County was founded in 1837, formed from Dubuque County and Jackson County, and named after Thomas Hart Benton.
What is the county seat of Benton County?
The county seat of Benton County is Vinton.
Is there an online parcel map for Benton County?
Yes. Benton County publishes a parcel map of 17,744 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Benton County's boundary or name changed?
Benton County was created in 1837 from Dubuque County and Jackson County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Linn County, Tama County and Black Hawk County.
Is my lot in a flood zone?
We do not have flood maps for Benton 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