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County · code 17167

Sangamon CountyIllinois

Sangamon County is a county in Illinois with its seat in Springfield, formed on January 30, 1821. The county was named after the Sangamon River.

  • Founded1821
  • County seatSpringfield
  • Named forSangamon River, Illinois
  • Land area868 sq mi + 8.8 sq mi water
  • Population196,343 2020 Census
  • Parcels mapped105,623 checked 16 October 2026
Open the free map Click any parcel in Sangamon County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MenardChristianLoganMorganCassMacon Springfield Census outline · seat marked

Where it is

Sangamon on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCarroll CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountySangamon County Sangamon
Counties of Illinois · Sangamon highlighted

History

Formed in 1821 from Bond County and Madison County

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

Sangamon County was created from Bond and Madison counties in 1821. Over the following decades, Sangamon lost territory to the creation of Morgan, Christian, Logan, Menard, and Macon counties.

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

  1. 1821
    Sangamon County created Sangamon created from Bond and Madison.
    from Bondfrom Madison
    · Ill. Laws 1820-1821, pp. 45-46
  2. 1823
    Lost territory Sangamon lost to creation of Morgan.
    to Morgan
    · Ill. Laws 1822-1823, pp. 108-109; Ill. Laws 1834-1835, pp. 62-63
  3. 1824
    Lost territory Sangamon lost to creation of Non-County Area 6. · Ill. Laws 1824-1825, pp. 20-22
  4. 1839
    Lost territory Sangamon lost to creation of Dane (now Christian), Logan, and Menard.
    to Daneto Christianto Loganto Menard
    · Ill. Laws 1838-1839, pp. 104-107
  5. 1839
    Lost territory Sangamon lost to Macon.
    to Macon
    · Ill. Laws 1838-1839, p. 265
Show all 9 changes (4 more)
  1. 1821
    Sangamon County created Sangamon created from Bond and Madison.
    from Bondfrom Madison
    · Ill. Laws 1820-1821, pp. 45-46
  2. 1823
    Lost territory Sangamon lost to creation of Morgan.
    to Morgan
    · Ill. Laws 1822-1823, pp. 108-109; Ill. Laws 1834-1835, pp. 62-63
  3. 1824
    Lost territory Sangamon lost to creation of Non-County Area 6. · Ill. Laws 1824-1825, pp. 20-22
  4. 1839
    Lost territory Sangamon lost to creation of Dane (now Christian), Logan, and Menard.
    to Daneto Christianto Loganto Menard
    · Ill. Laws 1838-1839, pp. 104-107
  5. 1839
    Lost territory Sangamon lost to Macon.
    to Macon
    · Ill. Laws 1838-1839, p. 265
  6. 1841
    Changed Legislature authorized creation of Allen (proposed) from Sangamon, Macoupin, and Morgan, dependent on local referendum that failed (no change).
    AllenMacoupinMorgan
    · Ill. Laws 1840-1841, pp. 87-90
  7. 1843
    Lost territory Sangamon lost to Menard.
    to Menard
    · Ill. Laws 1842-1843, p. 94
  8. 1847
    Lost territory Sangamon lost to Menard.
    to Menard
    · Ill. Laws 1846-1847, priv. and spec., p. 39
  9. 1851
    Changed Legislature authorized creation of Oregon (proposed) from Sangamon, Macoupin, and Morgan, dependent on local referendum that failed (no change).
    OregonMacoupinMorgan
    · Ill. Laws 1851, gen., pp. 131-134

Land and parcels

What the maps cover in Sangamon

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

Sangamon by the Census

Population
196,343 2020 Census count
Housing units
92,982 2020 Census count
Land area
868 square miles
Water area
8.8 square miles
People per sq mi
226 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.

Permits

Zoning and code

County government

See your own lot on these maps

Open Sangamon 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 Sangamon County

When was Sangamon County founded?
Sangamon County was founded in 1821, formed from Bond County and Madison County, and named after Sangamon River, Illinois.
What is the county seat of Sangamon County?
The county seat of Sangamon County is Springfield.
Is there an online parcel map for Sangamon County?
Yes. Sangamon County publishes a parcel map of 105,623 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Sangamon County's boundary or name changed?
Sangamon County was created in 1821 from Bond County and Madison County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Menard County, Christian County and Dane County.
Who issues building permits in Sangamon County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Sangamon 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