Search Illinois Phone Directory
Illinois runs a large network of state, county, and city offices across all 102 counties and more than 1,200 municipalities. Each one has its own phone number, office address, and hours of service. This Illinois phone directory brings all of that contact information into one place so you can find it fast. You can search for phone numbers at every level of government, from the state capitol in Springfield to your local city hall or village office. Use this directory to look up the right number and get the details you need without spending time on hold or clicking through dozens of sites.
Illinois Phone Directory Quick Facts
Illinois State Government Phone Directory
The State of Illinois keeps a searchable employee phone directory online through the Department of Central Management Services. The Illinois Telephone Directory lets you search by last name, first name, phone number, or state agency. It covers all state employees and their office contact details. There is also a Work Unit Listing page that shows phone numbers sorted by department. These tools make it easy to find the right person at any state office in Illinois.
The Illinois state government website is the main hub for all state services and contact information. You can reach the general information line at 217-782-2000. The TTY line is 800-526-0844.
The Illinois Secretary of State office runs several key departments with their own phone lines. Call 217-785-3000 from Springfield or 800-252-8980 toll-free from within Illinois. The public records department has a direct line at 217-558-4072. The index department, which handles business filings and document searches, picks up at 217-782-2284. These are some of the most called numbers in the state phone directory for Illinois.
How to Find Phone Numbers in Illinois
There are a few ways to look up phone numbers for Illinois government offices. The fastest method is to use an online phone directory. The state runs one for its own staff. Most counties post their department contacts on a county website. Cities and villages do the same on their own sites. You can also call a main switchboard number, and the operator will transfer you to the right department or give you a direct line.
If you need a full list of contacts for a specific office, you can file a request under the Illinois Freedom of Information Act. Under 5 ILCS 140, public bodies must give you access to their records. That includes phone directories and staff lists. Most agencies respond within 5 business days. The first 50 pages of any request are typically free. After that, you pay 10 to 15 cents per page. Commercial requests take up to 21 business days. A written request is best for tracking, but many offices in Illinois now take FOIA requests by email too.
Note: Some smaller cities may not have a phone directory posted online, so calling city hall is often the quickest route.
Illinois Phone Directory Records and FOIA
The Illinois Freedom of Information Act gives you the right to access public records from any government body in the state. Phone directories, contact lists, and staff rosters all fall under this law. A public record in Illinois includes any document, report, form, letter, or electronic file that relates to the work of a public agency. That is spelled out in the full text of 5 ILCS 140.
The state keeps a full list of FOIA officers for each agency. You can view that list on the Illinois FOIA contacts page. Key contacts include the Department on Aging at 217-785-3346, the Department of Agriculture at 217-524-6905, and the Department of Corrections at 217-558-2200 ext. 4166. The Governor's Office takes FOIA requests at GOV.FOIA@Illinois.gov. Each county and city in Illinois also has its own FOIA officer who handles local phone directory and contact requests.
Under the Illinois Local Records Act (50 ILCS 205), local governments must keep and preserve their public records. This includes phone directories and department contact lists that residents may request. The Illinois State Records Act (5 ILCS 160) does the same for state agencies and also set up the State Archives.
Key State Agency Phone Numbers
Illinois has dozens of state agencies. Each one has its own phone number and office. The Illinois State Police headquarters is at 801 S. 7th Street, Suite 300-S in Springfield. The main phone number is 217-782-6637. The Illinois State Archives is inside the Margaret Cross Norton Building in the Capitol Complex. Call 217-782-4866 for general info, or 217-782-2647 for the State Records Management Unit. The Local Records Management Unit picks up at 217-782-1080.
The Illinois Department of Labor takes FOIA requests at 312-793-1805. Other key numbers in the state phone directory include the Department of Natural Resources at 217-782-1809, the Environmental Protection Agency at 217-558-5101, and the Commerce Commission at 217-782-7434. The Department of Human Services handles calls at 312-814-6693.
The state phone directory also covers the Illinois courts system. The Illinois Courts website has a full list of circuit courts sorted by county. Each circuit court has its own clerk with a direct phone number. The Illinois Vital Records Act (410 ILCS 535) governs access to birth, death, and marriage records through the Department of Public Health. The Illinois Election Code (10 ILCS 5) covers voter registration records and election information. Both of those agencies have their own phone lines listed in the state directory.
County Phone Directories in Illinois
Illinois has 102 counties. Each one runs its own set of government offices with separate phone numbers. A county phone directory lists the contacts for the county board, circuit clerk, county clerk, sheriff, state's attorney, treasurer, recorder, and other departments. Most counties in Illinois now post this information on a county website.
The largest counties have the most departments and the most phone lines to track. Cook County serves over 5.2 million people and has dozens of offices. Its main phone number is 312-443-5500. DuPage County picks up at 630-407-6400. Lake County answers at 847-377-2000. Will County's main line is 815-722-5515. Even smaller counties in Illinois keep full phone directories for all of their departments. Pick a county below to find its phone directory with all department numbers, office addresses, and hours.
City and Village Phone Directories
Cities, villages, and towns in Illinois run their own government offices, separate from the county. Each city has a main phone number that connects to city hall or the village office. From there you can reach police, fire, public works, the city clerk, and other departments. Chicago uses 311 for city services. Aurora, Elgin, and Schaumburg also have 311 systems.
Illinois has dozens of cities with more than 10,000 residents, and each one listed below has its own phone directory page. Those pages show local department contacts, office hours, and locations specific to that city or town in Illinois.
Browse Illinois Phone Directory by County
Each county in Illinois keeps its own phone directory and department contacts. Pick a county below to get local phone numbers and office information.
Phone Directory for Major Illinois Cities
Residents of Illinois cities can look up local phone numbers on each city page below. Every city page lists department contacts, office hours, and links to the city website.