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County · code 29139

Montgomery CountyMissouri

Montgomery County is a county in Missouri with its seat in Montgomery City. The county was formed in 1819 from St. Charles County and named after Richard Montgomery.

  • Founded1819
  • County seatMontgomery City
  • Named forRichard Montgomery
  • Land area535 sq mi + 5.4 sq mi water
  • Population11,322 2020 Census
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Updated

WarrenAudrainCallawayGasconadeLincolnOsage Montgomery City Census outline · seat marked

Where it is

Montgomery 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 · Montgomery highlighted

History

Formed in 1819 from St. Charles County

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

Montgomery County was created in 1819 from St. Charles County, with an attached Non-County Area for judicial and administrative purposes. In 1821, part of the attached area was lost to the creation of Callaway County, and the remainder was detached from Montgomery and attached to Callaway. The county lost additional territory to the creation of Warren County in 1833 and to Lincoln County in 1849.

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

  1. 1819
    Montgomery County created Montgomery created from St. Charles; Non-County Area 3 attached to Montgomery "for judicial, probate, administration and county purposes."
    from St. Charles
    · Mo. Terr. Laws 1818-1819, ch. 230, secs. 1, 8/pp. 580-584
  2. 1821
    Lost territory Montgomery lost part of attached Non-County Area 3 to creation of Callaway; remainder of Non-County Area 3 detached from Montgomery and attached to Callaway for administrative and judicial purposes.
    to Callaway
    · Mo. Laws 1820-1821, ch. 29, secs. 1, 8/pp. 52-55
  3. 1833
    Lost territory Montgomery lost to creation of Warren.
    to Warren
    · Mo. Laws 1832-1833, pub., ch. 95, sec. 1/pp. 126-128
  4. 1849
    Lost territory Montgomery lost to Lincoln.
    to Lincoln
    · Mo. Laws 1848-1849, pub., p. 34

Land and parcels

What the maps cover in Montgomery

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

Montgomery by the Census

Population
11,322 2020 Census count
Housing units
5,758 2020 Census count
Land area
535 square miles
Water area
5.4 square miles
People per sq mi
21 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

Montgomery 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 Montgomery 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 Montgomery County

When was Montgomery County founded?
Montgomery County was founded in 1819, formed from St. Charles County, and named after Richard Montgomery.
What is the county seat of Montgomery County?
The county seat of Montgomery County is Montgomery City.
Is there an online parcel map for Montgomery County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Montgomery County's boundary or name changed?
Montgomery County was created in 1819 from St. Charles County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Callaway County, Lincoln County and Warren County.
Is my lot in a flood zone?
We do not have flood maps for Montgomery 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