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Illinois County Map

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Illinois County Maps

The state of Illinois has 102 counties. Explore them all in our maps below.

Illinois County Maps

PHYSICAL MAP

Illinois Topographic County Map

Illinois is mostly flat, but with some low river valleys and higher ground near the southern tip. Our Illinois topographic county map is a clear way to see counties and highways across the state.

Illinois Topographic County Map
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SATELLITE IMAGERY

Illinois Satellite County Map

Our satellite map of Illinois shows its farmland, forests, and urban areas. You’ll be able to pick out major cities, river systems, and county borders.

Illinois Satellite County Map
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OUTLINE MAP

Illinois Simple County Map

This clean, simple map shows Illinois divided into its counties with clear lines and labels. Download it and print it with a black and white printer.

Illinois Simple County Map
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Illinois Counties

The most populous county is Cook County, and it’s not even close. With Chicago taking center stage, this urban powerhouse is home to over 5 million folks. That’s nearly half the state’s population crammed into one county. The least populous county is Hardin County with just over 3,800 residents.

Most Populous: Cook County
Least Populous: Hardin County

Illinois Map United States

When it comes to size, things are get a bit weird. Taking into account just land area, McLean County has the largest landmass. But if you include water, then Cook County is largest. Putnam County is just 160 square miles in landmass. This makes it the smallest in size of all counties in Illinois.

Largest Area: McLean County
Smallest Area: Putnam County

Illinois counties have some stories behind their names. Take Effingham County. It’s named after Lord Effingham, a British general. And speaking of history, St. Clair County holds the title of oldest county in the state, established in 1790. That’s older than blue jeans and the light bulb.

Illinois County List

Here’s a complete list of all the counties in Illinois:

FIPS CodeNameLand %Water %Total Area (sq mi)
17-001Adams County98.11.9871.3
17-003Alexander County93.26.8252.6
17-005Bond County99.30.7382.8
17-007Boone County99.50.5282.1
17-009Brown County99.50.5307.3
17-011Bureau County99.50.5873.6
17-013Calhoun County89.510.5283.6
17-015Carroll County95.44.6466.6
17-017Cass County97.92.1383.7
17-019Champaign County99.80.2998.5
17-021Christian County99.10.9715.8
17-023Clark County99.30.7504.8
17-025Clay County99.70.3469.5
17-027Clinton County94.25.8503.2
17-029Coles County99.60.4510.1
17-031Cook County57.842.21,634.6
17-033Crawford County99.50.5445.8
17-035Cumberland County99.70.3346.9
17-037DeKalb County99.50.5634.6
17-039De Witt County98.11.9405.1
17-041Douglas County99.90.1417.2
17-043DuPage County97.42.6336.4
17-045Edgar County99.90.1624.0
17-047Edwards County99.90.1222.7
17-049Effingham County99.70.3480.0
17-051Fayette County98.81.2725.3
17-053Ford County99.90.1486.2
17-055Franklin County94.85.2431.4
17-057Fulton County98.11.9882.7
17-059Gallatin County98.41.6328.1
17-061Greene County99.40.6546.3
17-063Grundy County97.12.9430.5
17-065Hamilton County99.70.3435.9
17-067Hancock County97.52.5814.4
17-069Hardin County97.72.3181.6
17-071Henderson County95.84.2395.2
17-073Henry County99.70.3825.6
17-075Iroquois County99.90.11,119.0
17-077Jackson County97.03.0602.4
17-079Jasper County99.30.7498.2
17-081Jefferson County97.82.2583.8
17-083Jersey County97.92.1377.1
17-085Jo Daviess County97.12.9618.6
17-087Johnson County98.61.4348.9
17-089Kane County99.10.9524.2
17-091Kankakee County99.30.7681.3
17-093Kendall County99.40.6322.2
17-095Knox County99.50.5719.8
17-097Lake County32.467.61,368.3
17-099LaSalle County98.91.11,148.2
17-101Lawrence County99.50.5374.1
17-103Lee County99.40.6728.9
17-105Livingston County99.80.21,045.9
17-107Logan County99.90.1618.9
17-109McDonough County99.90.1590.2
17-111McHenry County98.71.3611.1
17-113McLean County99.70.31,186.3
17-115Macon County99.10.9585.7
17-117Macoupin County99.50.5867.6
17-119Madison County96.73.3740.5
17-121Marion County99.40.6576.0
17-123Marshall County97.12.9398.5
17-125Mason County95.74.3563.5
17-127Massac County98.11.9241.8
17-129Menard County99.70.3315.5
17-131Mercer County98.71.3568.7
17-133Monroe County96.73.3398.3
17-135Montgomery County99.20.8709.6
17-137Morgan County99.40.6572.3
17-139Moultrie County97.52.5344.5
17-141Ogle County99.40.6763.0
17-143Peoria County98.11.9630.5
17-145Perry County98.81.2446.9
17-147Piatt County99.90.1439.4
17-149Pike County97.92.1848.9
17-151Pope County98.51.5374.3
17-153Pulaski County98.02.0203.2
17-155Putnam County93.07.0172.1
17-157Randolph County96.43.6597.0
17-159Richland County99.50.5361.9
17-161Rock Island County94.75.3451.3
17-163St. Clair County97.62.4673.9
17-165Saline County98.21.8386.8
17-167Sangamon County99.01.0877.0
17-169Schuyler County99.10.9441.3
17-171Scott County99.30.7252.8
17-173Shelby County98.81.2768.1
17-175Stark County99.90.1288.3
17-177Stephenson County99.90.1565.1
17-179Tazewell County98.21.8657.9
17-181Union County97.92.1422.1
17-183Vermilion County99.70.3901.2
17-185Wabash County98.11.9227.5
17-187Warren County99.90.1543.0
17-189Washington County99.80.2563.9
17-191Wayne County99.80.2715.5
17-193White County98.61.4501.9
17-195Whiteside County98.21.8696.5
17-197Will County98.41.6849.2
17-199Williamson County94.65.4444.3
17-201Winnebago County98.91.1519.2
17-203Woodford County97.32.7542.6

Source: United States Census Bureau

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