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County · code 55083

Oconto CountyWisconsin

Oconto County is a county in Wisconsin, with its seat in Oconto. It was created on February 6, 1851, from Brown County and named after the Oconto River.

  • Founded1851
  • County seatOconto
  • Named forOconto River, Wisconsin
  • Land area997 sq mi + 151 sq mi water
  • Population38,965 2020 Census
  • Parcels mapped42,026 checked 16 October 2026
Open the free map Click any parcel in Oconto County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MarinetteMenomineeBrownShawanoForestLanglade Oconto Census outline · seat marked

Where it is

Oconto on the map of Wisconsin

Wisconsin has 72 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAshland CountyBarron CountyBayfield CountyBrown CountyBuffalo CountyBurnett CountyCalumet CountyChippewa CountyClark CountyColumbia CountyCrawford CountyDane CountyDodge CountyDoor CountyDouglas CountyDunn CountyEau Claire CountyFlorence CountyFond du Lac CountyForest CountyGrant CountyGreen CountyGreen Lake CountyIowa CountyIron CountyJackson CountyJefferson CountyJuneau CountyKenosha CountyKewaunee CountyLa Crosse CountyLafayette CountyLanglade CountyLincoln CountyManitowoc CountyMarathon CountyMarinette CountyMarquette CountyMenominee CountyMilwaukee CountyMonroe CountyOneida CountyOutagamie CountyOzaukee CountyPepin CountyPierce CountyPolk CountyPortage CountyPrice CountyRacine CountyRichland CountyRock CountyRusk CountySt. Croix CountySauk CountySawyer CountyShawano CountySheboygan CountyTaylor CountyTrempealeau CountyVernon CountyVilas CountyWalworth CountyWashburn CountyWashington CountyWaukesha CountyWaupaca CountyWaushara CountyWinnebago CountyWood CountyOconto County Oconto
Counties of Wisconsin · Oconto highlighted

History

Formed in 1851 from Brown County

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

Oconto County was created from Brown County on February 6, 1851, but initially remained attached to Brown County for judicial purposes. Over several decades, the county lost territory to the creation of neighboring counties including Shawano in 1853, Marathon in 1860, and Marinette in 1879. In 1882, the county lost additional land to Marinette, with the transferred area becoming part of the newly created Florence County.

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

  1. 1851
    Oconto County created Oconto created from Brown; Oconto not fully organized, attached to Brown "for all judicial purposes."
    from Brown
    · Wis. Laws 1851, ch. 44, sec. 1/pp. 31-32
  2. 1853
    Lost territory Oconto lost to creation of Shawano.
    to Shawano
    · Wis. Laws 1853, gen., ch. 9, sec. 1/pp. 9-10
  3. 1854
    Lost territory Oconto lost to Shawano.
    to Shawano
    · Wis. Laws 1854, gen., ch. 23, secs. 1, 3-4/pp. 31-32
  4. 1856
    Gained territory Oconto gained from Winnebago.
    from Winnebago
    · Wis. Laws 1856, reg. sess., gen., ch. 45, secs. 1-4/p. 48
  5. 1858
    Gained territory Oconto gained from Shawano.
    from Shawano
    · Wis. Rev. Stat. 1858, ch. 2, secs. 6, 35, 46/pp. 61, 68, 71
Show all 15 changes (10 more)
  1. 1851
    Oconto County created Oconto created from Brown; Oconto not fully organized, attached to Brown "for all judicial purposes."
    from Brown
    · Wis. Laws 1851, ch. 44, sec. 1/pp. 31-32
  2. 1853
    Lost territory Oconto lost to creation of Shawano.
    to Shawano
    · Wis. Laws 1853, gen., ch. 9, sec. 1/pp. 9-10
  3. 1854
    Lost territory Oconto lost to Shawano.
    to Shawano
    · Wis. Laws 1854, gen., ch. 23, secs. 1, 3-4/pp. 31-32
  4. 1854
    Changed Oconto fully organized, detached from Brown.
    Brown
    · Wis. Laws 1854, gen., ch. 14, secs. 1, 7/pp. 21-22
  5. 1855
    Changed Oconto re-attached to Brown "for judicial purposes."
    Brown
    · Wis. Laws 1855, gen., ch. 11, sec. 2/p. 14
  6. 1856
    Gained territory Oconto gained from Winnebago.
    from Winnebago
    · Wis. Laws 1856, reg. sess., gen., ch. 45, secs. 1-4/p. 48
  7. 1857
    Changed Oconto fully organized, detached from Brown.
    Brown
    · Wis. Laws 1857, priv. and loc., ch. 309, secs. 1, 4/pp. 805-806
  8. 1858
    Gained territory Oconto gained from Shawano.
    from Shawano
    · Wis. Rev. Stat. 1858, ch. 2, secs. 6, 35, 46/pp. 61, 68, 71
  9. 1860
    Lost territory Oconto lost to Marathon and Shawano.
    to Marathonto Shawano
    · Wis. Laws 1860, gen., ch. 119, secs. 1-3, 6/p. 106 and ch. 120, secs. 1-2/p. 107
  10. 1879
    Lost territory Oconto lost to creation of Marinette and New (now Langlade), exchanged with Shawano.
    to Marinetteto Newto Langladeto Shawano
    · Wis. Laws 1879, ch. 114, secs. 2-3, 12-13, 17/pp. 113-118
  11. 1881
    Lost territory Oconto lost to Shawano.
    to Shawano
    · Wis. Laws 1881, ch. 7, secs. 1-3, 8, 13/pp. 11, 13-14
  12. 1882
    Lost territory Oconto lost to Marinette. The transferred area became part of Florence, which was created this same day.
    to Marinetteto Florence
    · Wis. Laws 1882, ch. 165, secs. 1-3, 13/pp. 488-489, 491
  13. 1886
    Lost territory Oconto lost to Forest.
    to Forest
    · Wis. Laws 1885, ch. 436, secs. 14-15/p. 430
  14. 1919
    Lost territory Oconto lost small area to Brown.
    to Brown
    · Wis. Laws 1919, reg. sess., ch. 96, secs. 1, 6/pp. 104, 106; ch. 617, secs. 1-2/pp. 1085-1086; ch. 702/pp. 1344-1345
  15. 1961
    Lost territory Oconto lost to creation of Menominee.
    to Menominee
    · Wis. Laws 1959, ch. 259, secs. 1, 3, 30, 42/pp. 300-301, 310, 314

Land and parcels

What the maps cover in Oconto

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

Oconto by the Census

Population
38,965 2020 Census count
Housing units
23,754 2020 Census count
Land area
997 square miles
Water area
151 square miles
People per sq mi
39 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

Oconto 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 Oconto County

When was Oconto County founded?
Oconto County was founded in 1851, formed from Brown County, and named after Oconto River, Wisconsin.
What is the county seat of Oconto County?
The county seat of Oconto County is Oconto.
Is there an online parcel map for Oconto County?
Yes. Oconto County publishes a parcel map of 42,026 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Oconto County's boundary or name changed?
Oconto County was created in 1851 from Brown County. Since then the Atlas of Historical County Boundaries records 14 later changes, chiefly involving Shawano County, Brown County and Marinette County.
Is my lot in a flood zone?
We do not have flood maps for Oconto 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