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Illinois · Northern Illinois · #432
DeKalb County, Illinois
DeKalb County invented barbed wire, and that unglamorous fact - a patent filed in 1874 by Joseph Glidden that changed the American West forever - says something true about a county that has always found practical solutions to large problems, including the problem of building a genuine university town on the Illinois prairie.
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Office: DeKalb County Sheriff’s Office – Sycamore, IL. Confirm current phone via dekalbcounty.org. DeKalb County Sheriff’s Police coordinates with City of DeKalb Police, Illinois State Police, and Northern Illinois University Police via shared radio communications.
Notes: For an active emergency, call 911.
Roads & Utilities
ROADS & TRANSPORTATION
Roads: I-88 and I-39 serve Sycamore, the county seat, roughly 63 miles west of Chicago; the city of DeKalb is the county’s largest population center, about 65 miles from downtown Chicago.
Notes: DeKalb County was formed March 4, 1837, from Kane County, named for Johann de Kalb, a German (Bavarian) hero of the American Revolutionary War. The railroad’s arrival spurred major growth and industrial development in the mid-1800s.
Business & Permits
BUILDING & PERMITS
Office: DeKalb County Courthouse – Sycamore, IL.
Notes: DeKalb County is genuinely the birthplace of modern barbed wire, a world-changing agricultural innovation. Joseph Glidden, a DeKalb farmer, received the 1874 patent for the double-strand barbed wire design still in common use today, earning an estimated $1,000,000 in royalties before his patent expired in 1892 and becoming one of the richest men in America. In a delightful local detail, Glidden himself served as DeKalb County Sheriff from 1852 to 1854, years before his invention. He partnered with businessman Isaac L. Ellwood to found the Barb Fence Company; a third local competitor, German immigrant carpenter Jacob Haish, also pioneered his own barbed wire design in DeKalb around the same period. Glidden and Ellwood later played a substantial role in founding the state teachers college that became Northern Illinois University (established 1895 as Northern Illinois State Normal School, renamed NIU in 1957), donating land for the campus. DeKalb also played a leading national role in developing commercial hybrid corn beginning in 1934, and the DeKalb Municipal Band, founded 1854, claims to be Illinois’s oldest continuously operating city band. DeKalb is the hometown of supermodel Cindy Crawford.
Veterans Services
VETERANS SERVICES
Office: DeKalb County Veterans Assistance Commission – confirm current contact via dekalbcounty.org.
Libraries
LIBRARIES
Sycamore Public Library / DeKalb Public Library (Sycamore/DeKalb) – confirm current addresses/phones via the county library system.
Parks & Recreation
PARKS & RECREATION
Key Assets: The Northern Illinois University campus, sites connected to barbed wire history (including the Ellwood House Museum in DeKalb), and downtown Sycamore’s historic square are the county’s premier heritage and cultural attractions.
Notes: The genuine, world-changing invention of barbed wire in DeKalb – by a man who happened to also serve as county sheriff – is among the most distinctive local facts covered anywhere in this project.
GIS & Maps
GIS & MAPS
Appraisal/Parcel Search: DeKalb County Assessor’s Office – confirm current contact via dekalbcounty.org.
Animal Services
ANIMAL SERVICES
Confirm current dedicated shelter contact via dekalbcounty.org; DeKalb County Sheriff’s Office for animal control arrangements.
Environmental & Waste
ENVIRONMENTAL / WASTE MANAGEMENT
Office: DeKalb County Environmental Health – confirm current contact via dekalbcounty.org.
NOTES: DeKalb County is the nineteenth county completed in Illinois’s Round 3 v2 redo, under the A+ sourced standard established for this project. The genuine, world-changing invention of barbed wire in DeKalb – by a man who also served as county sheriff – is among the most distinctive local facts covered anywhere in this project. All contact information above was sourced via web search as of early August 2026 and should be reconfirmed directly with the relevant office before a visit, deadline-sensitive filing, or emergency-adjacent decision.
About DeKalb County
DeKalb County is northern Illinois’s barbed wire invention and university county – Joseph Glidden’s 1874 innovation that fenced the American West and Northern Illinois University’s campus in DeKalb define a county at the edge of the Chicago suburban zone where corn belt agriculture and college-town character coexist with the expanding metropolitan influence of the nation’s third-largest city.
Sycamore (the county seat, population ~18,000) is DeKalb County’s governmental hub, while DeKalb (population ~44,000) serves as the county’s commercial and university center – a northern Illinois community balancing agricultural heritage, higher education, and Chicago exurban growth.
All Services
Browse every category and topic available for this county.
DeKalb County Supervisor of Assessments at 110 E. Sycamore Street, Sycamore, IL 60178, phone 815-895-7120. IL assessed at 33.33% of market value.
Courts & Legal
DeKalb County Circuit Court at 133 W. State Street, Sycamore, IL 60178, phone 815-895-7131, handles probate.
Senior Services
Northwestern Illinois Area Agency on Aging
729 34th Avenue, Rock Island, IL 61201 (regional office)
Phone: (309) 793-6800
Senior transportation, Meals on Wheels, caregiver support, and long-term care options counseling for DeKalb County residents.
Marriage & Vital Records
Marriage licenses, divorce records, and birth & death certificates are handled by the following office(s):
COUNTY CLERK (Records, Vital Records, Elections)
200 N. Main St., Sycamore, IL 60178
(815) 895-7149
CIRCUIT CLERK (Court Records, Marriage Licenses)
133 W. State St., Sycamore, IL 60178
(815) 895-7131
ELECTIONS (County Clerk)
200 N. Main St., Sycamore, IL 60178
(815) 895-7149
Genealogy
County-level record sources
DeKalb County Circuit Clerk (probate/estate case files – see Probate section above).
Northern Illinois University Regional History Center, DeKalb – significant regional research holdings.
Local societies
No dedicated DeKalb 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
DeKalb County Circuit Clerk 133 West State Street, Sycamore, IL 60178 (815) 895-7131
Hours: 8:30 a.m.–4:30 p.m. DeKalb County is home to Northern Illinois University. The 1905 DeKalb County Courthouse (Classical Revival, National Register of Historic Places) still serves as the county’s primary judicial center.
Step 1: figure out which path applies
Illinois has NOT adopted the Uniform Probate Code and is not a community property state – it follows common law property principles. Illinois probate is governed by the Probate Act of 1975 (755 ILCS 5/). Two main paths:
Small Estate Affidavit – for estates where personal property (excluding real estate) is valued at $150,000 or less (raised from $100,000 effective August 15, 2025), with no unresolved debts or claims and no real estate involved. No formal court probate is required.
Formal Probate (Independent or Supervised Administration) – required when the estate doesn’t qualify for the small estate affidavit. Most Illinois probate cases proceed under Independent Administration, letting the estate representative act without prior court approval for most routine actions.
Step 2: filing for formal probate
File the decedent’s original will (if one exists) with the DeKalb County Circuit Clerk, where the decedent resided at death.
Petition the court to open the estate and appoint an executor (if there’s a will) or an administrator (if intestate).
The court issues Letters of Office (Letters Testamentary or Letters of Administration) appointing the representative.
Publish notice to creditors and unknown heirs as required by Illinois law.
Under Independent Administration, the representative marshals assets, pays valid debts and taxes, and distributes the remaining estate without needing court approval for each step.
File a final accounting or closing documents to formally close the estate.
What it costs
Illinois imposes its own state estate tax on estates valued above $4 million, with rates up to 16%. There is no Illinois inheritance tax.
Filing fees vary by county – confirm current amounts with the DeKalb County Circuit Clerk.
Most uncontested probate proceedings in Illinois can be completed within about a year.
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
150 N. Main St., Sycamore, IL 60178
(815) 895-2155
Elections & Voting
Voter registration, polling locations, and elections information are handled by the following office(s):
COUNTY CLERK (Records, Vital Records, Elections)
200 N. Main St., Sycamore, IL 60178
(815) 895-7149
ELECTIONS (County Clerk)
200 N. Main St., Sycamore, IL 60178
(815) 895-7149
Health & Human Services
Offices & Contacts
Health services, social services, and assistance programs are handled by the following office(s):
De Kalb County Health Dept
(815) 748-2400
IL DCFS — De Kalb
(815) 787-5300
IL Medicaid
(800) 843-6154
Northwestern Medicine Kishwaukee Hospital (De Kalb)
nm.org/kishwaukee
Public Health Information
PUBLIC HEALTH
Office: DeKalb County Health Department – confirm current contact via dekalbcounty.org.
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Last verified June 2026
County Facts
County Seat: DeKalb
Population: 105,000
Area: 636 sq mi
Established: 1837
Tier: 3
Public Records
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