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County · code 29093

Iron CountyMissouri

Iron County is a county in Missouri, formed in 1857 with its seat in Ironton.

  • Founded1857
  • County seatIronton
  • Named foriron ore
  • Land area550 sq mi + 1.8 sq mi water
  • Population9,537 2020 Census
  • Parcels mapped11,604 checked 14 October 2026
Open the free map Click any parcel in Iron County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ReynoldsSt. FrancoisWashingtonMadisonWayneCrawfordDent Ironton Census outline · seat marked

Where it is

Iron on the map of Missouri

Missouri has 115 counties and county equivalents, each with its own records office. Shapes with a page are links.

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Counties of Missouri · Iron highlighted

History

Formed in 1857 from Madison County, Reynolds County, St. Francois County, Washington County and Wayne County

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

Iron County was created on February 17, 1857, from parts of Madison, Reynolds, St. Francois, Washington, and Wayne counties. The county was named after iron ore, a natural resource found in the area. Iron County experienced multiple boundary changes over the following decades, gaining and losing territory to neighboring counties including Crawford, Dent, and Reynolds between 1857 and 1879.

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

  1. 1857
    Iron County created Iron created from Madison, Reynolds, St. Francois, Washington, and Wayne.
    from Madisonfrom Reynoldsfrom St. Francoisfrom Washingtonfrom Wayne
    · Mo. Laws 1856-1857, gen., pp. 52-55
  2. 1857
    Gained territory Iron gained from Crawford, Dent, and Washington.
    from Crawfordfrom Dentfrom Washington
    · Mo. Laws 1856-1857, gen., p. 55
  3. 1857
    Lost territory Iron lost to Crawford.
    to Crawford
    · Mo. Laws 1857, adj. sess., loc., pp. 406-407
  4. 1868
    Gained territory Iron gained from Crawford.
    from Crawford
    · Mo. Laws 1868, adj. sess., gen., pp. 16-23
  5. 1868
    Lost territory Iron lost to Reynolds.
    to Reynolds
    · Mo. Laws 1868, adj. sess., gen., pp. 24-25
Show all 8 changes (3 more)
  1. 1857
    Iron County created Iron created from Madison, Reynolds, St. Francois, Washington, and Wayne.
    from Madisonfrom Reynoldsfrom St. Francoisfrom Washingtonfrom Wayne
    · Mo. Laws 1856-1857, gen., pp. 52-55
  2. 1857
    Gained territory Iron gained from Crawford, Dent, and Washington.
    from Crawfordfrom Dentfrom Washington
    · Mo. Laws 1856-1857, gen., p. 55
  3. 1857
    Lost territory Iron lost to Crawford.
    to Crawford
    · Mo. Laws 1857, adj. sess., loc., pp. 406-407
  4. 1868
    Gained territory Iron gained from Crawford.
    from Crawford
    · Mo. Laws 1868, adj. sess., gen., pp. 16-23
  5. 1868
    Lost territory Iron lost to Reynolds.
    to Reynolds
    · Mo. Laws 1868, adj. sess., gen., pp. 24-25
  6. 1869
    Lost territory Iron lost to Crawford.
    to Crawford
    · Mo. Laws 1869, gen., pp. 9-10
  7. 1872
    Gained territory Iron gained from Reynolds.
    from Reynolds
    · Mo. Laws 1871-1872, adj. sess., gen., pp. 25-26
  8. 1879
    Gained territory Iron gained from Crawford (the area gained by Iron was incorrectly included as part of Crawford in the state's Revised Statutes until 1929).
    from Crawford
    · Mo. Rev. Stat. 1879, pp. 1015-1044

Land and parcels

What the maps cover in Iron

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

Iron by the Census

Population
9,537 2020 Census count
Housing units
4,688 2020 Census count
Land area
550 square miles
Water area
1.8 square miles
People per sq mi
17 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.

Records

County government

See your own lot on these maps

Open Iron 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 Iron County

When was Iron County founded?
Iron County was founded in 1857, formed from Madison County, Reynolds County, St. Francois County, Washington County and Wayne County, and named after iron ore.
What is the county seat of Iron County?
The county seat of Iron County is Ironton.
Is there an online parcel map for Iron County?
Yes. Iron County publishes a parcel map of 11,604 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Iron County's boundary or name changed?
Iron County was created in 1857 from Madison County, Reynolds County, St. Francois County, Washington County and Wayne County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Crawford County, Reynolds County and Dent County.
Is my lot in a flood zone?
We do not have flood maps for Iron 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