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County · code 29183

St. Charles CountyMissouri

St. Charles County is a county in Missouri, with its seat in St. Charles. It was created in 1812 as St. Charles District and was named after Charles Borromeo.

  • Founded1812
  • County seatSt. Charles
  • Named forCharles Borromeo
  • Land area561 sq mi + 32 sq mi water
  • Population405,262 2020 Census
  • Parcels mapped172,883 checked 14 October 2026
Open the free map Click any parcel in St. Charles County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

St. LouisCalhoun, ILLincolnJersey, ILWarrenFranklinMadison, IL St. Charles Census outline · seat marked

Where it is

St. Charles on the map of Missouri

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

Adair CountyAndrew CountyAtchison CountyAudrain CountyBarry CountyBarton CountyBates CountyBenton CountyBollinger CountyBoone CountyBuchanan CountyButler CountyCaldwell CountyCallaway CountyCamden CountyCape Girardeau CountyCarroll CountyCarter CountyCass CountyCedar CountyChariton CountyChristian CountyClark CountyClay CountyClinton CountyCole CountyCooper CountyCrawford CountyDade CountyDallas CountyDaviess CountyDeKalb CountyDent CountyDouglas CountyDunklin CountyFranklin CountyGasconade CountyGentry CountyGreene CountyGrundy CountyHarrison CountyHenry CountyHickory CountyHolt CountyHoward CountyHowell CountyIron CountyJackson CountyJasper CountyJefferson CountyJohnson CountyKnox CountyLaclede CountyLafayette CountyLawrence CountyLewis CountyLincoln CountyLinn CountyLivingston CountyMcDonald CountyMacon CountyMadison CountyMaries CountyMarion CountyMercer CountyMiller CountyMississippi CountyMoniteau CountyMonroe CountyMontgomery CountyMorgan CountyNew Madrid CountyNewton CountyNodaway CountyOregon CountyOsage CountyOzark CountyPemiscot CountyPerry CountyPettis CountyPhelps CountyPike CountyPlatte CountyPolk CountyPulaski CountyPutnam CountyRalls CountyRandolph CountyRay CountyReynolds CountyRipley CountySt. Clair CountySte. Genevieve CountySt. Francois CountySt. Louis CountySaline CountySchuyler CountyScotland CountyScott CountyShannon CountyShelby CountyStoddard CountyStone CountySullivan CountyTaney CountyTexas CountyVernon CountyWarren CountyWashington CountyWayne CountyWebster CountyWorth CountyWright CountySt. Louis citySt. Charles County St. Charles
Counties of Missouri · St. Charles highlighted

History

Founded in 1812

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

St. Charles District was created on October 1, 1804, as one of five districts by the District of Louisiana, encompassing a vast area between the Mississippi River and the Rocky Mountains that included all or part of six present states. The District of Louisiana was renamed Louisiana Territory in 1805, and St. Charles District became a district within it; the territory was then renamed Missouri Territory in 1812. By the end of 1813, St. Charles County had lost virtually all its territory to non-county areas in Missouri Territory.

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

  1. 1804
    St. Charles County created St. Charles District (now St. Charles) created within the District of Louisiana. · Terr. Papers U.S., 13: 51-52; U.S. Stat., vol. 2, ch. 38 [1804]/pp. 283-289; Violette, 46-47
  2. 1805
    Renamed The District of Louisiana was renamed Louisiana Territory and was fully organized as a separate territory. St. Charles (Missouri) District became a district (county) in Louisiana Territory; boundaries were unchanged.
    formerly The District of Louisiana Was
    · U.S. Stat., vol. 2, ch. 31 [1805]/pp. 331-332
  3. 1813
    Lost territory St. Charles lost to creation of Non-County Area 2. · Mo. Terr. Laws 1813-1814, ch. 99, sec. 1/pp. 293-295
  4. 1815
    Gained territory St. Charles gained from Non-County Area 2. · Terr. Papers U.S., 15:40-41
  5. 1816
    Lost territory St. Charles lost to creation of Howard.
    to Howard
    · Mo. Terr. Laws 1815-1816, ch. 162, secs. 1, 8/pp. 460-464
Show all 8 changes (3 more)
  1. 1804
    St. Charles County created St. Charles District (now St. Charles) created within the District of Louisiana. · Terr. Papers U.S., 13: 51-52; U.S. Stat., vol. 2, ch. 38 [1804]/pp. 283-289; Violette, 46-47
  2. 1805
    Renamed The District of Louisiana was renamed Louisiana Territory and was fully organized as a separate territory. St. Charles (Missouri) District became a district (county) in Louisiana Territory; boundaries were unchanged.
    formerly The District of Louisiana Was
    · U.S. Stat., vol. 2, ch. 31 [1805]/pp. 331-332
  3. 1812
    Changed St. Charles District became St. Charles County. · Terr. Papers U.S., 14:599-601; U.S. Stat., vol. 2, ch. 95[1812]/pp. 743-747
  4. 1813
    Lost territory St. Charles lost to creation of Non-County Area 2. · Mo. Terr. Laws 1813-1814, ch. 99, sec. 1/pp. 293-295
  5. 1815
    Gained territory St. Charles gained from Non-County Area 2. · Terr. Papers U.S., 15:40-41
  6. 1816
    Lost territory St. Charles lost to creation of Howard.
    to Howard
    · Mo. Terr. Laws 1815-1816, ch. 162, secs. 1, 8/pp. 460-464
  7. 1819
    Lost territory St. Charles lost to creation of Lincoln, Montgomery, and Non-County Area 3.
    to Lincolnto Montgomery
    · Mo. Terr. Laws 1818-1819, chs. 228, 230/pp. 572-576, 580-584
  8. 1819
    Lost territory St. Charles lost to creation of Pike.
    to Pike
    · Mo. Terr. Laws 1818-1819, ch. 231, secs. 1, 8/pp. 585-588

Land and parcels

What the maps cover in St. Charles

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

St. Charles by the Census

Population
405,262 2020 Census count
Housing units
161,144 2020 Census count
Land area
561 square miles
Water area
32 square miles
People per sq mi
723 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

County government

See your own lot on these maps

Open St. Charles 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 St. Charles County

When was St. Charles County founded?
St. Charles County was founded in 1812, and named after Charles Borromeo.
What is the county seat of St. Charles County?
The county seat of St. Charles County is St. Charles.
Is there an online parcel map for St. Charles County?
Yes. A public source publishes a parcel map of 172,883 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has St. Charles County's boundary or name changed?
St. Charles County was created in 1804. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Howard County, Lincoln County and Montgomery County. It was formerly called The District of Louisiana Was.
Who issues building permits in St. Charles County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Who issues septic and well permits in St. Charles County?
The county's page on septic systems and wells: Commission on Environmental Quality.
Is my lot in a flood zone?
We do not have flood maps for St. Charles 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