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County · code 29071

Franklin CountyMissouri

Franklin County is a county in Missouri, with its seat in Union. The county was formed in 1819 and named after Benjamin Franklin.

  • Founded1819
  • County seatUnion
  • Named forBenjamin Franklin
  • Land area923 sq mi + 8 sq mi water
  • Population104,682 2020 Census
  • Parcels mapped71,922 checked 16 October 2026
Open the free map Click any parcel in Franklin County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

WarrenGasconadeWashingtonCrawfordSt. CharlesJeffersonSt. Louis Union Census outline · seat marked

Where it is

Franklin 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 · Franklin highlighted

History

Formed in 1819 from St. Louis County

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

Franklin County was created in 1819 from St. Louis County. In 1821, Franklin County lost territory to the creation of Gasconade County. Between 1825 and 1845, Franklin County underwent several boundary changes, losing territory to Washington County and Crawford County.

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

  1. 1819
    Franklin County created Franklin created from St. Louis.
    from St. Louis
    · Mo. Terr. Laws 1818-1819, ch. 225, secs. 1, 8/pp. 562-566
  2. 1821
    Lost territory Franklin lost to creation of Gasconade and Non-County Area 8.
    to Gasconade
    · Mo. Laws 1820-1821, ch. 28, secs. 1-2, 5/pp. 51-52
  3. 1825
    Lost territory Franklin lost to creation of Non-County Area 11; Non-County Area 11 attached to Franklin "for administrative and judicial purposes." · Mo. Laws 1824-1825, pub., ch. 14, sec. 9/pp. 16-19
  4. 1825
    Lost territory Franklin lost to Washington and Non-County Area 11. Non-County Area 11 gained from Washington.
    to Washington
    · Mo. Laws Rev., 1825, ch.1, sec. 9/p. 234
  5. 1831
    Lost territory Franklin lost part of attached Non-County Area 11 to Crawford.
    to Crawford
    · Mo. Laws 1830-1831, pub., ch. 14, sec. 1/p. 21
  6. 1845
    Lost territory Franklin lost attached Non-County Area 11 to Crawford; Non-County Area 11 eliminated.
    to Crawford
    · Mo. Rev. Stat. 1845, secs. 79, 84/pp. 144, 147

Land and parcels

What the maps cover in Franklin

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

Franklin by the Census

Population
104,682 2020 Census count
Housing units
45,275 2020 Census count
Land area
923 square miles
Water area
8 square miles
People per sq mi
113 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

County government

See your own lot on these maps

Open Franklin 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 Franklin County

When was Franklin County founded?
Franklin County was founded in 1819, formed from St. Louis County, and named after Benjamin Franklin.
What is the county seat of Franklin County?
The county seat of Franklin County is Union.
Is there an online parcel map for Franklin County?
Yes. Franklin County publishes a parcel map of 71,922 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Franklin County's boundary or name changed?
Franklin County was created in 1819 from St. Louis County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Crawford County, Gasconade County and Washington County.
Is my lot in a flood zone?
We do not have flood maps for Franklin 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