Jefferson County

Arnold
Barnhart
Byrnes Mill
Cedar Hill
Cedar Hill Lakes
Crystal City
De Soto
Festus
Herculaneum
High Ridge
Hillsboro
Horine
Imperial
Murphy
Olympian Village
Parkdale
Pevely
Scotsdale
HASC code :US-MO-JE
FIPS 6-4 code :29099
Capital :Hillsboro
Largest city :Arnold
Elevation :High : High Ridge 927 ft
Low : Horine 420 ft
Population :198,099
Land Area :657 sq mi
(1,702 km²)
Density :301.52/sq mi
(116.42/km²)
Time zone :UTC -6
Website :http://www.jeffcomo.org