Clark County topographic map

When Chicago was founded in 1837, most of the early building was around the mouth of the Chicago River, as can be seen on a map of the city's original 58 blocks. The overall grade of the city's central, built-up areas is relatively consistent with the natural flatness of its overall natural geography,…

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Kendall County is a small but rapidly growing county that has the majority of its population in the northeast and along the Fox River (the only river in the county), which runs through the county's northwestern section. Many new subdivisions have been constructed in this county, which has produced considerable…

Average elevation: 200 m

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The city is at an elevation of 558 feet (170 m) above sea level. According to the 2010 census, Springfield has a total area of 65.764 square miles (170.33 km2), of which 59.48 square miles (154.05 km2) (or 90.44%) is land and 6.284 square miles (16.28 km2) (or 9.56%) is water. The city is located in the Lower…

Average elevation: 178 m

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Macon County is primarily flat, as is most of the state and all of the surrounding counties, the result of geological activity during the Pleistocene epoch. During the Illinoian Stage of the Pleistocene, the Laurentide Ice Sheet covered about 85 percent of Illinois, including the Macon County area. The…

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Bloomington is located at 40°29′03″N 88°59′37″W. The city is at an elevation of 797 feet (243 m) above sea level. According to the 2010 census, Bloomington has a total area of 27.229 square miles (70.52 km2), of which 27.22 square miles (70.50 km2) (or 99.97%) is land and 0.009 square miles (0.02…

Average elevation: 246 m

Average elevation: 149 m

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Average elevation: 137 m

Cairo (/ˈkɛəroʊ/ KAIR-oh, sometimes /ˈkeɪroʊ/ KAY-roh) is the southernmost city in Illinois and the county seat of Alexander County. A river city, Cairo has the lowest elevation of any location in Illinois and is the only Illinois city to be surrounded by levees. It is in the river-crossed area of…

Average elevation: 95 m

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Manteno is located in northern Kankakee County and is bordered to the south by the village of Bourbonnais. The average elevation is 675 ft (206 m).

Average elevation: 206 m

La Grange is located at 41°48′29″N 87°52′24″W / 41.80806°N 87.87333°W / 41.80806; -87.87333 (41.807938, −87.873455), about 13 miles (21 km) west of Chicago. The village is roughly flat, only deviating from the elevation of 645 feet by at most ten feet. La Grange is surrounded by…

Average elevation: 199 m

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Streator lies within the Vermilion River/Illinois River Basin Assessment Area (VRAA) defined by the watershed of the Vermilion River, a major tributary to the Illinois River in Central Illinois, an area of mostly flat prairie. The topography of the basin is a complex collection of buried valleys, lowlands and…

Average elevation: 191 m

The western part of the county on the Mississippi River is part of the American Bottom floodplain, while the eastern portion of the county is relatively flat and was originally prairie. The transition zone between has high bluffs of limestone and dolomite and has distinctive Karst topography with numerous…

Average elevation: 157 m

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Average elevation: 104 m

According to the 2021 census gazetteer files, Matteson has a total area of 9.32 square miles (24.14 km2), of which 9.29 square miles (24.06 km2) (or 99.64%) is land and 0.03 square miles (0.08 km2) (or 0.36%) is water. The village's topography is mostly flat.

Average elevation: 218 m

Average elevation: 198 m

Average elevation: 189 m

Highwood is located in southeastern Lake County at 42°12′19″N 87°48′44″W / 42.205357°N 87.812345°W / 42.205357; -87.812345, on a ridge 100 feet (30 m) above the elevation of Lake Michigan.

Average elevation: 198 m

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Average elevation: 185 m