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Place Name
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Jefferson County
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Place Status (Type)
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county
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Capital is
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Hillsboro
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Population
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171,380 (1990)
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Location
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St. Louis County, Missouri (MO), United States, North America
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Latitude
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38°16'N
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Longitude
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90°35'W
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Jefferson
, county (
667 sq mi/1,728 sq km; 1990 pop.
171,380), E Mo.;  Hillsboro; 38°16'N 90°35'W. On Mississippi
R. (E) and Meramec R. (NE and NW); drained by Big R. Agr. (corn, hay;
livestock); silica (sand), barite mines. Very hilly area experiencing
urban growth, esp. in N and E. Part of St. Louis metropolitan area;
major towns with mfg. include Arnold, Pevely, Herculaneum (lead
smelter), Festus-Crystal City, and De Soto. Major uninc. residential
areas include Imperial, Barnhart, High Ridge, House Springs, Fenton
(city of Fenton is in St. Louis co.). Mastodon State Park
archaeological site and mus. at Imperial. Sandy Creek Covered Bridge
State Historic Site. Formed 1818.
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