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County · code 19015

Boone CountyIowa

Boone County is a county in Iowa, founded in 1846, with its seat at Boone.

  • Founded1846
  • County seatBoone
  • Named forNathan Boone
  • Land area570 sq mi + 3.1 sq mi water
  • Population26,715 2020 Census
  • Parcels mapped24,449 checked 16 October 2026
Open the free map Click any parcel in Boone County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Story Boone Census outline · seat marked

Where it is

Boone 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 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 CountyBoone County Boone
Counties of Iowa · Boone 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.

Boone County was created on January 13, 1846, from Linn County, but remained unorganized and attached to Polk County for administrative purposes. The county became fully organized on October 1, 1849, when it detached from Polk County. Between 1853 and 1855, several surrounding counties were temporarily attached to Boone for administrative and judicial purposes before being detached as they became organized.

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

  1. 1846
    Boone County created Boone created by Iowa Territory from Non-County Area 7 attached to Linn; Boone not fully organized, not attached.
    from Linn
    · Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74
  2. 1846
    Changed Boone attached to Polk "for election, revenue, and judicial purposes".
    Polk
    · Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95
  3. 1846
    Became part of Iowa Boone 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. 1853
    Renamed Bancroft, Emmet, Fox (renamed Calhoun), Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas, Winnebago, Webster and Wright attached to Boone for administrative and judicial purposes. Story detached from Polk, attached to Boone for administrative and judicial purposes.
    formerly Bancroftformerly Emmetformerly Foxformerly Calhounformerly Hancockformerly Humboldtformerly Kossuthformerly Palo Altoformerly Pocahontasformerly Winnebagoformerly Websterformerly Wrightformerly Storyformerly Polk
    · Iowa Acts 1852-1853, ch. 12, secs. 1, 4/p. 28; ch 52, sec. 1/pp. 87-88
  5. 1855
    Eliminated Calhoun detached from Boone, attached to Greene; Emmet, Hancock, Kossuth, Palo Alto, Pocahontas, Winnebago, and Wright detached from Boone, attached to Webster. All attachments were "for election, judicial, and revenue purposes." Bancroft and Humboldt eliminated this date; ending their attachments to Boone.
    into Calhouninto Greeneinto Emmetinto Hancockinto Kossuthinto Palo Altointo Pocahontasinto Winnebagointo Wrightinto Websterinto Bancroftinto Humboldt
    · Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211
Show all 9 changes (4 more)
  1. 1846
    Boone County created Boone created by Iowa Territory from Non-County Area 7 attached to Linn; Boone not fully organized, not attached.
    from Linn
    · Iowa Terr. Laws 1845-1846, ch. 82, secs. 5, 7-8/p. 74
  2. 1846
    Changed Boone attached to Polk "for election, revenue, and judicial purposes".
    Polk
    · Iowa Terr. Laws 1845-1846, ch. 101, secs. 1, 11-12/pp. 92-95
  3. 1846
    Became part of Iowa Boone 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 Boone fully organized, detached from Polk.
    Polk
    · Swisher, "Organization of Counties," 574-575
  5. 1853
    Renamed Bancroft, Emmet, Fox (renamed Calhoun), Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas, Winnebago, Webster and Wright attached to Boone for administrative and judicial purposes. Story detached from Polk, attached to Boone for administrative and judicial purposes.
    formerly Bancroftformerly Emmetformerly Foxformerly Calhounformerly Hancockformerly Humboldtformerly Kossuthformerly Palo Altoformerly Pocahontasformerly Winnebagoformerly Websterformerly Wrightformerly Storyformerly Polk
    · Iowa Acts 1852-1853, ch. 12, secs. 1, 4/p. 28; ch 52, sec. 1/pp. 87-88
  6. 1853
    Changed Story fully organized, detached from Boone.
    Story
    · Swisher, "Organization of Counties," 576
  7. 1853
    Changed Webster fully organized, detached from Boone.
    Webster
    · Swisher, "Organization of Counties," 576
  8. 1855
    Eliminated Calhoun detached from Boone, attached to Greene; Emmet, Hancock, Kossuth, Palo Alto, Pocahontas, Winnebago, and Wright detached from Boone, attached to Webster. All attachments were "for election, judicial, and revenue purposes." Bancroft and Humboldt eliminated this date; ending their attachments to Boone.
    into Calhouninto Greeneinto Emmetinto Hancockinto Kossuthinto Palo Altointo Pocahontasinto Winnebagointo Wrightinto Websterinto Bancroftinto Humboldt
    · Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211
  9. 1880
    Changed Story authorized to gain the parts of the town of Sheldahl located in Boone and Polk, dependent upon local referendum that failed (no change).
    StoryPolk
    · Garver, "Establishment of Counties," 434; Iowa Acts 1880, ch. 197, secs. 1-3/pp. 191-192

Land and parcels

What the maps cover in Boone

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

Boone by the Census

Population
26,715 2020 Census count
Housing units
11,921 2020 Census count
Land area
570 square miles
Water area
3.1 square miles
People per sq mi
47 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.

Records

Permits

Zoning and code

GIS and maps

County government

See your own lot on these maps

Open Boone 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 Boone County

When was Boone County founded?
Boone County was founded in 1846, formed from Linn County, and named after Nathan Boone.
What is the county seat of Boone County?
The county seat of Boone County is Boone.
Is there an online parcel map for Boone County?
Yes. A public source publishes a parcel map of 24,449 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Boone County's boundary or name changed?
Boone County was created in 1846 from Linn County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Polk County, Webster County and Bancroft County.
Who issues building permits in Boone County?
The county's page on building permits: Applications and Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Boone 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