List of 40 Zip Codes in Williamson County, Illinois

On this page, we'll list out the 40 Williamson County, Illinois ZIP codes we have, including the land area and county name of each code.

Illinois is the 25th largest state by total land area, with a land area of 57,914 square miles (149,997 square kilometers) and has a total population of 12,716,164 people as of the most recent U.S. Census survey.

Williamson County makes up approximately 3.56% of the total land area for Illinois and we have 40 zip codes for the county in our database, which you can see details of below, with land area information for each zip code.

More Counties in Illinois

If you want to search and find zip codes for different counties in Illinois, the list below contains links to each of the 103 Illinois counties we have data for.

• Adams County
• Alexander County
• Bond County
• Boone County
• Brown County
• Bureau County
• Calhoun County
• Carroll County
• Cass County
• Champaign County
• Christian County
• Clark County
• Clay County
• Clinton County
• Coles County
• Cook County
• Crawford County
• Cumberland County
• De Witt County
• DeKalb County
• Douglas County
• DuPage County
• Edgar County
• Edwards County
• Effingham County
• Fayette County
• Ford County
• Franklin County
• Fulton County
• Gallatin County
• Greene County
• Grundy County
• Hamilton County
• Hancock County
• Hardin County
• Henderson County
• Henry County
• Iroquois County
• Jackson County
• Jasper County
• Jefferson County
• Jersey County
• Jo Daviess County
• Johnson County
• Kane County
• Kankakee County
• Kendall County
• Knox County
• Lake County
• LaSalle County
• Lawrence County
• Lee County
• Livingston County
• Logan County
• Macon County
• Macoupin County
• Madison County
• Marion County
• Marshall County
• Mason County
• Massac County
• McDonough County
• McHenry County
• McLean County
• Menard County
• Mercer County
• Monroe County
• Montgomery County
• Morgan County
• Moultrie County
• Ogle County
• Peoria County
• Perry County
• Piatt County
• Pike County
• Pope County
• Pulaski County
• Putnam County
• Randolph County
• Richland County
• Rock Island County
• Saline County
• Sangamon County
• Schuyler County
• Scott County
• Shelby County
• St. Clair County
• Stark County
• Ste. Genevieve County
• Stephenson County
• Tazewell County
• Union County
• Vermilion County
• Wabash County
• Warren County
• Washington County
• Wayne County
• White County
• Whiteside County
• Will County
• Williamson County
• Winnebago County
• Woodford County

Data Source(s)

All of the zip code data on this page is sourced from the United States Census Bureau geography reference files.

Link To or Reference This Page

We spent a lot of time downloading, cleaning, merging, and formatting the data that is shown on the site.

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