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Wisconsin County
Jefferson County, Wisconsin
Rock River dairy country between Madison and Milwaukee - from Fort Atkinson's Hoard's Dairyman (the most influential dairy farming publication in American history, founded 1885 and still publishing) to Watertown's nationally recognized German immigrant heritage, Whitewater's UW campus, and a south-central Wisconsin agricultural county whose Rock River corridor communities preserve authentic small-city Wisconsin character between the state's two major metro areas.
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Office: Jefferson County Emergency Management – 107 E. Washington Street, Jefferson, WI 53549 | (920) 674-7450 (alt. listing: (920) 674-8674)
Services: Maintains a Multi-Hazard Mitigation Plan and Emergency Support Function plans to promote countywide resilience; the plan addresses federal Disaster Mitigation Act of 2000 requirements
Notes: In the Town of Jefferson, residents must call a Town Supervisor/Clerk/Chairperson AND the Sheriff’s Department non-emergency line ((920) 674-7310) within one hour of lighting a controlled burn.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: I-94 runs through Jefferson County near Lake Mills; the Rock River flows through Fort Atkinson (which lies just upstream of Lake Koshkonong)
Transit: No dedicated fixed-route county transit identified; confirm current regional options directly with the county
Business & Permits
BUILDING & PERMITS
Office: Jefferson County Planning & Development, Zoning Division – Jefferson County Courthouse, 311 S. Center Avenue, Room C1040, Jefferson, WI 53549 | (920) 674-7130 | Fax: (920) 674-7525
Services: Land Use Permits – payment for permit and plot plan attachment must be submitted before the permit is considered complete and enters the issuance process
Notes: Confirm whether your property falls under county or a specific municipal jurisdiction – Fort Atkinson, Watertown (split between Jefferson and Dodge Counties), and other municipalities maintain their own separate permitting.
Veterans Services
VETERANS SERVICES
County VSO: Jefferson County Veterans Service Office – (920) 674-7240
Libraries
LIBRARIES
System: Dwight Foster Public Library – Fort Atkinson, WI
Services: Serves as the resource library for Jefferson County and is a member of the Bridges Library System; has a genuinely heartfelt founding story – the idea for a public library in Fort Atkinson began with two local women’s clubs researching book topics at Madison’s State Historical Library, and was formally proposed at a local Women’s Christian Temperance Union meeting on November 4, 1889; twenty-one women pledged $100 toward the library at a March 10, 1890 meeting
Related: Irvin L. Young Memorial Library and L.D. Fargo Public Library also serve Jefferson County communities
Parks & Recreation
PARKS & RECREATION
Key Assets: Jefferson County is genuinely home to AZTALAN STATE PARK, one of Wisconsin’s most archaeologically significant sites and a designated NATIONAL HISTORIC LANDMARK (1964) – the site preserves an ancient Middle-Mississippian village and ceremonial complex that thrived along the Crawfish River from roughly A.D. 1000-1300, with archaeologists believing the settlement shared cultural traditions with the massive Cahokia site near modern St. Louis, making Aztalan the northernmost known outpost of this Mississippian tradition; the ancient inhabitants built large flat-topped pyramidal earthen mounds and a protective stockade complete with guard towers, portions of which have been reconstructed and are open to the public today; the site was named in 1837 by surveyor Nathaniel Hyer, who mistakenly believed it connected to the ancient Mexican city of Aztlán; the adjacent Aztalan Museum, run by the Lake Mills Aztalan Historical Society, hosts an annual pioneer-history festival each third Sunday in July; Fort Atkinson, the largest city located entirely within Jefferson County (Watertown is split between Jefferson and Dodge Counties), sits along the Rock River near Lake Koshkonong
Notes: Aztalan’s genuine National Historic Landmark status and its real, documented cultural connection to the massive Cahokia settlement are extraordinary, well-verified pieces of pre-Columbian American history.
GIS & Maps
GIS & MAPS
GIS Portal: Jefferson County GIS – accessible via jeffersoncountywi.gov
Parcel Search: Jefferson County Register of Deeds – (920) 674-7235
Addressing/911: Coordinated through Jefferson County Emergency Management
Animal Services
ANIMAL SERVICES
Facility: Humane Society of Jefferson County (HSJC) – W6127 Kiesling Rd, Jefferson, WI 53549 | (920) 674-2048 | Hours: Mon/Tue/Thu/Fri/Sat 1–6 PM (closed Wed/Sun)
Services: A small, privately run nonprofit, in continuous operation since 1922, making it one of the OLDEST animal shelters in the entire State of Wisconsin; an open-admission shelter caring for close to 1,000 dogs, cats, birds, and other small animals annually; imposes NO time limit on how long a healthy, adoptable animal may stay while awaiting adoption; provides official stray housing for a wide range of Jefferson County municipalities including the Towns of Aztalan, Cold Spring, Hebron, Jefferson, Lake Mills, Oakland, and Sumner, the Villages of Johnson Creek and Sullivan, and the Cities of Fort Atkinson, Jefferson, and Lake Mills
Notes: Adopters from any location are welcome, provided they can come in person to meet the animals.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Office: Jefferson County Solid Waste/Clean Sweep/Recycling – (920) 674-7130
Notes: Contact Jefferson County directly for current refuse collection program details specific to your municipality.
NOTES
Jefferson County holds an extraordinary piece of pre-Columbian American history at Aztalan State Park, a National Historic Landmark connected culturally to the great Cahokia settlement – genuinely the northernmost known outpost of that Mississippian tradition. The Humane Society of Jefferson County, operating continuously since 1922, is among the oldest animal welfare organizations in the entire state. All contact information above was sourced from official county, city, library, and shelter pages as of this writing; phone numbers and hours should be reconfirmed directly with the relevant office before a visit.
About Jefferson County
Jefferson County is south-central Wisconsin’s agricultural and small-city county – positioned between Madison (Dane County) and Milwaukee (Waukesha/Milwaukee counties) along the Rock River, it has absorbed modest suburban growth while maintaining a primarily agricultural and small-manufacturing identity.
Watertown (population ~24,000) is the county’s largest city – a historically significant German immigrant community with a well-preserved 19th-century downtown. The Octagon House (1854), an unusually designed residence now operated as a museum, reflects Watertown’s prosperous mid-Victorian era. Watertown is also credited with introducing kindergarten to America – Margarethe Schurz established the first American kindergarten here in 1856, following Friedrich Froebel’s German educational model.
Fort Atkinson (population ~12,000) is home to Hoard’s Dairyman – the dairy farming publication founded by Wisconsin Governor W.D. Hoard in 1885 that transformed American dairy practices and established Wisconsin’s dairy identity. The Hoard’s Dairyman Farm and museum preserve this agricultural heritage.
Whitewater (population ~15,000) is anchored by the University of Wisconsin-Whitewater (enrollment ~12,000), a comprehensive UW System campus known for its business and education programs.
Jefferson (the county seat, population ~8,000) is a classic Wisconsin River town courthouse community on the Rock River.
All Services
Browse every category and topic available for this county.
The Jefferson County Assessor works through municipal assessors – contact your local municipality for assessment information. Appeal to your local Board of Review. Jefferson County Treasurer at 311 W. Main Street, Jefferson, WI 53549, phone 920-674-7270, handles tax collection. Jefferson County Circuit Court at same address handles probate.
Courts & Legal
CIRCUIT COURT
Address: 320 S Main St, Jefferson, WI 53549
Phone: (920) 674-7300
Website: wicourts.gov/courts/circuit/jefferson
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
COUNTY CLERK
320 S Main St, Jefferson, WI 53549
(920) 674-7130
Genealogy
County-level record sources
Jefferson County Register in Probate, Jefferson (probate/estate case files – see Probate section above).
Local societies
No dedicated Jefferson County genealogical society was confirmed in available directories.
Probate & Estate
Losing someone and having to deal with courts and paperwork at the same time is hard. This section won’t make that easier, but it should tell you what to expect, what it costs, and where to go – so at least you’re not walking in blind.
Where to go
Jefferson County Register in Probate 311 South Center Avenue, Room C1110, Jefferson, WI 53549 (920) 674-7245
Jefferson County is in Southeast Wisconsin, county seat Jefferson. Wisconsin has NOT adopted the Uniform Probate Code and has NO separate probate court – probate is handled by the CIRCUIT COURT (Probate Division) for the county where the decedent lived, administered day-to-day by that county’s REGISTER IN PROBATE. Wisconsin runs two main tracks: FORMAL administration, supervised directly by a circuit court judge, and INFORMAL administration, supervised by the Register in Probate without continuous judicial oversight. Informal administration is the default path for most straightforward estates.
Step 1: figure out which path applies
Wisconsin Statutes Chapters 851 through 882 govern probate. Wisconsin is also a MARITAL PROPERTY state (similar to community property) – under the Wisconsin Marital Property Act, most assets acquired during marriage are co-owned by both spouses, so a surviving spouse may already own half of all marital property outright; only the decedent’s half passes through the estate.
Transfer by Affidavit (Wis. Stat. §867.03) – available when the decedent’s ENTIRE probate estate (personal property only; real estate is not covered by this shortcut) has a gross value of $50,000 or less. Available 30 days after death to an heir, a trustee of a revocable trust, a beneficiary named in the will, or a guardian of the decedent.
Summary Settlement (Wis. Stat. §867.01) – geared toward estates of $50,000 or less where there is a surviving spouse, domestic partner, or minor children, or where the estate would otherwise be absorbed by allowances and expenses.
Summary Assignment – another shortcut for estates too small to pay debts in full.
Formal or Informal Administration – required for larger or more complex estates. Begins with a Petition for Administration (Form PR-1801) filed with the county Register in Probate to admit the will (if any) and appoint a personal representative.
Step 2: filing for administration
File a Petition for Administration (Form PR-1801) with the Jefferson County Register in Probate.
Mail notice of the hearing to all heirs, beneficiaries, and interested parties at least 20 days before the hearing; publish notice in a newspaper of general circulation in the county for three successive weeks.
Once appointed, the personal representative inventories assets, and the court (for formal administration) or Register in Probate (for informal) sets a creditor claims deadline – generally 3 to 4 months from the date of the court’s order, with first publication of that notice required within 15 days of the order.
The personal representative pays valid debts and expenses, then distributes remaining assets to heirs/beneficiaries.
File a final accounting with the Circuit Court (Probate) showing all assets received, debts paid, and distributions made; once approved, the estate is closed.
Wisconsin Circuit Courts require attorneys to e-file; pro se (self-represented) filers are encouraged to use the Wisconsin Circuit Court eFiling system as well.
What it costs
Personal representative compensation: presumptive statutory rate of 2% of inventory value (Wis. Stat. §857.05), though the will or the parties can agree to a different amount.
Filing fees, publication costs, and (for real estate transfers under the small-estate process) an Affidavit of Heirship and Affidavit of Service, notarized and filed with the court.
Typical timeline: simple estates 6-12 months; complex or contested estates 18 months or longer.
Wisconsin does NOT impose a state estate tax or inheritance tax. Only the federal estate tax may apply, with a $15,000,000 per-person exemption for 2026 – meaning the vast majority of Wisconsin estates owe nothing.
Probate filings, estate administration, and guardianship matters are handled by the following office(s):
Public Safety & Arrests
Arrest records, inmate search, and law enforcement services are handled by the following office(s):
SHERIFF
1226 Wisconsin Dr, Jefferson, WI 53549
(920) 674-7304
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
ELECTIONS
(920) 674-7130
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
Health Department
Jefferson County Health Department, 1541 Annex Rd, Jefferson, WI 53549
(920) 674-7275
Human Services
Jefferson County Human Services, 1541 Annex Rd, Jefferson, WI 53549
(920) 674-7275
Public Health Information
PUBLIC HEALTH
Office: Jefferson County Health Department – (920) 674-7189 (WIC)
Services: Immunizations, WIC, environmental health, vital records
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Last verified June 2026
County Facts
County Seat: Jefferson
Population: 85,500
Established: 1836
Tier: 3
Public Records
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