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County · code 29079

Grundy CountyMissouri

Grundy County is a county in Missouri, with its seat in Trenton. It was established in 1839 and named after Felix Grundy.

  • Founded1839
  • County seatTrenton
  • Named forFelix Grundy
  • Land area435 sq mi + 2.8 sq mi water
  • Population9,808 2020 Census
  • Parcels mapped9,613 checked 14 October 2026
Open the free map Click any parcel in Grundy County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MercerLivingstonDaviess Trenton Census outline · seat marked

Where it is

Grundy 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 · Grundy highlighted

History

Formed in 1839 from Livingston County

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

Grundy County was created from Non-County Area 18 on February 12, 1839, and initially attached to Livingston County for civil, judicial, and military purposes. The county was fully organized and detached from Livingston County on January 29, 1841. In 1843, Grundy County lost its attached territory to the creation of Mercer County, though Mercer remained attached to Grundy for civil and military purposes until its own full organization in 1845.

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

  1. 1839
    Grundy County created Grundy created from Non-County Area 18; Grundy not fully organized, attached to Livingston "for all civil, judicial, and military purposes."
    from Livingston
    · Mo. Laws 1838-1839, pub., p. 22
  2. 1841
    Changed Grundy fully organized, detached from Livingston.
    Livingston
    · Mo. Laws 1840-1841, pub., sec. 13/p. 34
  3. 1841
    Changed Non-County Area 18 detached from Livingston, attached to Grundy "for civil and military purposes."
    Livingston
    · Mo. Laws 1840-1841, pub., p. 39
  4. 1843
    Lost territory Grundy lost attached Non-County Area 18 to creation of Mercer; Non-County Area 18 eliminated. Mercer not fully organized, attached to Grundy "for civil and military purposes."
    to Mercer
    · Mo. Laws 1842-1843, pub., p. 37
  5. 1845
    Changed Mercer fully organized, detached from Grundy.
    Mercer
    · Mo. Laws 1844-1845, secs. 21, 41/pp. 33-34, 36

Land and parcels

What the maps cover in Grundy

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

Grundy by the Census

Population
9,808 2020 Census count
Housing units
4,844 2020 Census count
Land area
435 square miles
Water area
2.8 square miles
People per sq mi
23 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.

Zoning and code

GIS and maps

County government

See your own lot on these maps

Open Grundy 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 Grundy County

When was Grundy County founded?
Grundy County was founded in 1839, formed from Livingston County, and named after Felix Grundy.
What is the county seat of Grundy County?
The county seat of Grundy County is Trenton.
Is there an online parcel map for Grundy County?
Yes. Grundy County publishes a parcel map of 9,613 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Grundy County's boundary or name changed?
Grundy County was created in 1839 from Livingston County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Livingston County and Mercer County.
Is my lot in a flood zone?
We do not have flood maps for Grundy 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