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County · code 17085

Jo Daviess CountyIllinois

Jo Daviess County is a county in Illinois with its seat in Galena, formed in 1827 and named after Joseph Hamilton Daveiss.

  • Founded1827
  • County seatGalena
  • Named forJoseph Hamilton Daveiss
  • Land area601 sq mi + 18 sq mi water
  • Population22,035 2020 Census
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Updated

Lafayette, WICarrollJackson, IAStephensonDubuque, IAGrant, WI Galena Census outline · seat marked

Where it is

Jo Daviess on the map of Illinois

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

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Counties of Illinois · Jo Daviess highlighted

History

Formed in 1827 from Henry County, Mercer County and Putnam County

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

Jo Daviess County was created on February 17, 1827, from Henry, Mercer, and Putnam Counties. The county lost territory multiple times in the 1830s as new counties were created from its land, including Rock Island in 1831, Ogle, Whiteside, and Winnebago in 1836, Stephenson in 1837, and Carroll in 1839.

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

  1. 1827
    Jo Daviess County created Jo Daviess created from Henry, Mercer, and Putnam.
    from Henryfrom Mercerfrom Putnam
    · Ill. Rev. Code 1826-1827, pp. 117-118
  2. 1831
    Lost territory Jo Daviess lost to Henry and Putnam.
    to Henryto Putnam
    · Ill. Laws 1830-1831, pp. 54-57, 62-63
  3. 1831
    Lost territory Jo Daviess lost to creation of Rock Island; RoCk Island not fully organized, attached to Jo Daviess "for all judicial and other county purposes."
    to Rock Islandto Roto Island
    · Ill. Laws 1830-1831, pp. 52-53
  4. 1836
    Lost territory Jo Daviess lost to creation of Ogle, Whiteside, and Winnebago, and lost to Non-County Area 8; Whiteside not fully organized, attached to Jo Daviess until "organized."
    to Ogleto Whitesideto Winnebago
    · Ill. Laws 1835-1836, pp. 273-278
  5. 1837
    Lost territory Jo Daviess lost to creation of Stephenson.
    to Stephenson
    · Ill. Laws 1836-1837, pp. 96-100
Show all 8 changes (3 more)
  1. 1827
    Jo Daviess County created Jo Daviess created from Henry, Mercer, and Putnam.
    from Henryfrom Mercerfrom Putnam
    · Ill. Rev. Code 1826-1827, pp. 117-118
  2. 1831
    Lost territory Jo Daviess lost to Henry and Putnam.
    to Henryto Putnam
    · Ill. Laws 1830-1831, pp. 54-57, 62-63
  3. 1831
    Lost territory Jo Daviess lost to creation of Rock Island; RoCk Island not fully organized, attached to Jo Daviess "for all judicial and other county purposes."
    to Rock Islandto Roto Island
    · Ill. Laws 1830-1831, pp. 52-53
  4. 1833
    Changed Rock Island fully organized, detached from Jo Daviess.
    Rock Island
    · Ill. Laws 1832-1833, priv., pp. 17-18
  5. 1836
    Lost territory Jo Daviess lost to creation of Ogle, Whiteside, and Winnebago, and lost to Non-County Area 8; Whiteside not fully organized, attached to Jo Daviess until "organized."
    to Ogleto Whitesideto Winnebago
    · Ill. Laws 1835-1836, pp. 273-278
  6. 1836
    Changed Whiteside detached from Jo Daviess, attached to Ogle "for all judicial and county purposes."
    WhitesideOgle
    · History of Ogle, 299-300; Ill. Laws 1835-1836, p. 277
  7. 1837
    Lost territory Jo Daviess lost to creation of Stephenson.
    to Stephenson
    · Ill. Laws 1836-1837, pp. 96-100
  8. 1839
    Lost territory Jo Daviess lost to Ogle and lost to creation of Carroll.
    to Ogleto Carroll
    · Ill. Laws 1838-1839, pp. 160-162

Land and parcels

What the maps cover in Jo Daviess

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

Jo Daviess by the Census

Population
22,035 2020 Census count
Housing units
13,408 2020 Census count
Land area
601 square miles
Water area
18 square miles
People per sq mi
37 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

Jo Daviess 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

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Questions

Common questions about Jo Daviess County

When was Jo Daviess County founded?
Jo Daviess County was founded in 1827, formed from Henry County, Mercer County and Putnam County, and named after Joseph Hamilton Daveiss.
What is the county seat of Jo Daviess County?
The county seat of Jo Daviess County is Galena.
Is there an online parcel map for Jo Daviess 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 Jo Daviess County's boundary or name changed?
Jo Daviess County was created in 1827 from Henry County, Mercer County and Putnam County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Ogle County, Rock Island County and Whiteside County.
Is my lot in a flood zone?
We do not have flood maps for Jo Daviess 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