- Population: 22,804 (Change since 1990: +18.9%)
- Created: January 23, 1829
- County seat: Steelville
- Largest town: Cuba (Pop. 3,230)
- Name origin: William H. Crawford
- Amanda (Historical)
- Located just west of Cuba
- Latitude & Longitude: 38°03'34" N, 91°24'43" W
- Survey: T. 39 N., R. 4 W., Sec. 31
- Civil township: Benton
- USGS Quad: Cuba
- Named for the wife of George M. Jamison, postmaster
- Source: Goodspeed (p. 592)
- Argo (Unincorporated)
- Located on Route C northwest of Bourbon
- Latitude & Longitude: 38°11'02" N, 91°19'49" W
- Elevation: 952
- Civil township: Oak Hill
- USGS Quad: Argo
- Avery (Unincorporated)
- Latitude & Longitude: 38°03'12" N, 91°16'58" W
- Survey: T. 39 N., R. 3 W., Sec. 32
- Civil township: Liberty
- USGS Quad: Leasburg
- Berryman (Unincorporated)
- Located on MO 8 at the Washington County line
- Latitude & Longitude: 37°55'08" N, 91°05'43" W
- USGS Quad: Berryman
- Birds Nest (Unincorporated)
- Located north of Steelville
- Latitude & Longitude: 37°59'51" N, 91°21'33" W
- Elevation: 707
- Civil township: Meramec
- USGS Quad: Steelville
- Bourbon (Fourth-class city)
- Population: 1,348 (Change since 1990: +13.5%)
- Located on I-44 between Cuba and Sullivan
- Latitude & Longitude: 38°09'17" N, 91°14'38" W
- Name origin: Bourbon whiskey
- Boyd (Historical)
- Butts (Unincorporated)
- Located on Butts Road off MO 8 east of Steelville
- Latitude & Longitude: 37°59'45" N, 91°09'22" W
- Civil township: Courtois
- USGS Quad: Huzzah
- Canal (Historical)
- Center Post (Unincorporated)
- Latitude & Longitude: 37°50'38" N, 91°07'35" W
- Survey: T. 36 N., R. 2 W.
- Civil township: Osage
- USGS Quad: Davisville
- Cherry Valley (Unincorporated)
- Located southeast of Steelville, probably along Cherry Valley Road
- Latitude & Longitude: 37°57'17" N, 91°15'59" W
- Civil township: Courtois
- USGS Quad: Steelville
- Cherry Valley Junction (Historical)
- Cherryville (Unincorporated)
- Located at junction MO 19 and MO 49 southeast of Steelville
- Latitude & Longitude: 37°51'07" N, 91°16'36" W
- Elevation: 1020
- Civil township: Osage
- USGS Quad: Cherryville
- Source: Breuer (p. 102)
- Coffeyton (Unincorporated)
- Located between Leasburg and Bourbon
- Latitude & Longitude: 38°06'60" N, 91°16'22" W
- Elevation: 1021
- Civil township: Liberty
- USGS Quad: Leasburg
- Named for John Coffey, roadmaster for the Frisco Railroad
- Map: 1930 Frisco
- Source: Breuer (p. 35)
- Cook Station (Unincorporated)
- Located at the end of Route M on Meramec River southwest of Steelville
- Latitude & Longitude: 37°48'46" N, 91°26'16" W
- Elevation: 892
- Civil township: Union
- USGS Quad: Cook Station
- Named for Christopher Cook, settler who deeded land
to the railroad
- Source: Breuer (p. 99)
- Crossroads (Unincorporated)
- Latitude & Longitude: 38°04'29" N, 91°14'38" W
- Survey: T. 39 N., R. 3 W., Sec. 27
- Civil township: Liberty
- USGS Quad: Onondaga Cave
- Cuba (Fourth-class city)
- Population: 3,230 (Change since 1990: +27.3%)
- Located near interchange I-44 and MO 19 northwest of Steelville
- Latitude & Longitude: 38°03'46" N, 91°24'12" W
- Founded: December 1857
- Czar (Unincorporated)
- Latitude & Longitude: 37°45'11" N, 91°07'06" W
- Survey: T. 35 N., R. 2 W.
- Civil township: Osage
- USGS Quad: Courtois
- Davisville (Unincorporated)
- Previously known as: Boyers Mill
- Located on Route V southeast of Cherryville
- Latitude & Longitude: 37°48'28" N, 91°11'06" W
- Civil township: Osage
- USGS Quad: Davisville
- Post office: June 17, 1878 - Nov. 8, 1880 (Boyers Mill); Nov. 8, 1880 - Now (Davisville)
- Source: Breuer (p. 103)
- Delhi (Historical)
- Located somewhere near Argo
- Latitude & Longitude: 38°07'42" N, 91°20'51" W
- Survey: T. 39 N., R. 4 W., Sec. 3
- Civil township: Oak Hill
- USGS Quad: Argo
- Maps: 1886 McNally and 1895 McNally
- Dillard (Unincorporated)
- Latitude & Longitude: 37°44'12" N, 91°12'15" W
- Elevation: 897
- Civil township: Osage
- USGS Quad: Viburnum West
- Named for Joseph Dillard Cottrell, founder and
builder of Dillard Mill
- Source: Breuer (p. 114)
- Elayer (Unincorporated)
- Located on MO 8 east of Steelville
- Latitude & Longitude: 37°58'07" N, 91°16'42" W
- Civil township: Courtois
- USGS Quad: Steelville
- Elma (Historical)
- Fanning (Unincorporated)
- Located on Route ZZ southwest of Cuba
- Latitude & Longitude: 38°02'14" N, 91°28'11" W
- Civil township: Knobview
- USGS Quad: Cuba
- Named for John Fanning, Irish emigrant who settled here in 1861
- Source: Breuer (p. 77)
- Faulkner (Historical)
- Four Points (Unincorporated)
- Latitude & Longitude: 37°57'10" N, 91°05'44" W
- Elevation: 970
- Civil township: Courtois
- USGS Quad: Berryman
- Fox Springs (Unincorporated)
- Located just off Route KK southwest of Cuba
- Latitude & Longitude: 38°00'31" N, 91°27'33" W
- Civil township: Knobview
- USGS Quad: Cuba
- Goltra (Unincorporated)
- Located north of Cook Station
- Latitude & Longitude: 37°49'47" N, 91°26'12" W
- Survey: T. 36 N., R. 5 W., Sec. 23
- Elevation: 900
- Civil township: Union
- USGS Quad: Cook Station
- Halberts (Historical)
- Harrison Mills (Historical)
- Located east of Leasburg
- Latitude & Longitude: 38°04'49" N, 91°08'47" W
- Survey: T. 39 N., R. 2 W., Sec. 21
- Civil township: Liberty
- USGS Quad: Onondaga Cave
- Highway (Historical)
- Hinch (Unincorporated)
- Previously known as: Union
- Located on Hinch Road off Route N southeast of Bourbon
- Latitude & Longitude: 38°03'46" N, 91°09'19" W
- Civil township: Liberty
- USGS Quad: Onondaga Cave
- Named for William Hinch, settler
- Source: Breuer (p. 44)
- Hofflin (Unincorporated)
- Alternate name: Hofflins
- Located on the I-44 frontage road northeast of Cuba
- Latitude & Longitude: 38°05'45" N, 91°21'38" W
- Elevation: 1037
- Civil township: Benton
- USGS Quad: Leasburg
- Named for Walter Hofflin, who purchased land here in 1859
- Source: Breuer (p. 80)
- Huzzah (Unincorporated)
- Located near the end of Route Z
- Latitude & Longitude: 37°54'15" N, 91°09'26" W
- Civil township: Courtois
- USGS Quad: Huzzah
- Idlewild (Unincorporated)
- Located off MO 19 between Cuba and Steelville
- Latitude & Longitude: 38°00'46" N, 91°23'49" W
- Civil township: Meramec
- USGS Quad: Cuba
- Iron Center (Unincorporated)
- Located southwest of Cuba
- Latitude & Longitude: 38°02'05" N, 91°27'04" W
- Survey: T. 38 N., R. 5 W.
- Civil township: Meramec
- USGS Quad: Cuba
- Jake Prairie (Unincorporated)
- Located near the junction of Route EE and Route F in the northwest
corner of the county
- Latitude & Longitude: 38°09'48" N, 91°30'40" W
- Elevation: 929
- Civil township: Oak Hill
- USGS Quad: Redbird
- Keysville (Unincorporated)
- Previously known as: Elm Tree
- Located just off Route AA northeast of Wesco
- Latitude & Longitude: 37°52'31" N, 91°23'20" W
- Civil township: Union
- USGS Quad: Indian Springs
- Named for the Key family
- Founded: 1873 by Elijah and Matilda Key
- Source: Breuer (p. 95)
- Lead Branch Junction (Unincorporated)
- Latitude & Longitude: 37°54'13" N, 91°22'32" W
- Civil township: Union
- USGS Quad: Indian Springs
- Leasburg (Village)
- Population: 323 (Change since 1990: +11.8%)
- Latitude & Longitude: 38°05'31" N, 91°17'47" W
- Name origin: Samuel Lea
- Founded: April 20, 1869
- Limberlost (Unincorporated)
- Latitude & Longitude: 37°48'25" N, 91°21'33" W
- Elevation: 1141
- Civil township: Union
- USGS Quad: Cherryville
- Midland (Historical)
- Located north of Steelville, probably at or near Birds Nest
- Latitude & Longitude: 37°58'42" N, 91°19'37" W
- Survey: T. 38 N., R. 4 W., Sec. 26
- Civil township: Meramec
- USGS Quad: Steelville
- Founded: 1872 by the Midland Blast Furnace Co.
- Map: 1895 McNally
- Source: Goodspeed (p. 600)
- Oak Hill (Unincorporated)
- Located on Route CC near the Gasconade County line
- Latitude & Longitude: 38°12'21" N, 91°25'14" W
- Civil township: Oak Hill
- USGS Quad: Oak Hill
- Source: Goodspeed (p. 600)
- Oby (Historical)
- Located along Huzzah Creek northeast of Westover
- Patsy (Unincorporated)
- Located near Westover, southeast of Steelville
- Latitude & Longitude: 37°57'43" N, 91°16'20" W
- Civil township: Courtois
- USGS Quad: Steelville
- Roswell (Historical)
- Located south of Steelville
- Latitude & Longitude: 37°55'43" N, 91°22'28" W
- Survey: T. 37 N., R. 4 W., Sec. 16
- Elevation: 880
- Civil township: Meramec
- USGS Quad: Steelville
- Sankey (Unincorporated)
- Located just northeast of Steelville
- Latitude & Longitude: 37°58'37" N, 91°20'37" W
- Elevation: 732
- Civil township: Meramec
- USGS Quad: Steelville
- Scotia (Unincorporated)
- Located near the end of Route E
- Latitude & Longitude: 38°01'40" N, 91°12'49" W
- Civil township: Liberty
- USGS Quad: Onondaga Cave
- Service (Unincorporated)
- Previously known as: Hang Dog and Kolano
- Located near Berryman
- Latitude & Longitude: 37°58'17" N, 91°08'45" W
- Survey: T. 38 N., R. 2 W., Sec. 33
- Civil township: Courtois
- USGS Quad: Huzzah
- Map: 1895 McNally
- Source: Breuer (p. 83)
- St. Cloud (Village)
- Population: 56 (2000 census)
- Located along I-44 just northeast of Bourbon
- Latitude & Longitude: 38°10'07" N, 91°13'03" W
- Steelville (Fourth-class city)
- Population: 1,429 (Change since 1990: -2.5%)
- Latitude & Longitude: 37°58'05" N, 91°21'17" W
- Name origin: James Steel
- Founded: July 4, 1836
- Vilander (Unincorporated)
- Latitude & Longitude: 38°05'47" N, 91°07'53" W
- Elevation: 723
- Civil township: Liberty
- USGS Quad: Onondaga Cave
- Named for Calvin Vilander Lynch, whose wife
was first postmistress
- Source: Ramsay (p. 77)
- Vivian (Historical)
- Wesco (Unincorporated)
- Latitude & Longitude: 37°51'34" N, 91°25'55" W
- Elevation: 864
- Civil township: Union
- USGS Quad: Cook Station
- Westover (Unincorporated)
- Latitude & Longitude: 37°55'21" N, 91°13'40" W
- Civil township: Courtois
- USGS Quad: Huzzah
- Named for J. Hobart Westover, gristmill operator
- Source: Breuer (p. 82)
- Wildwoods (Unincorporated)
- Latitude & Longitude: 37°59'04" N, 91°22'09" W
- Survey: T. 38 N., R. 4 W., Sec. 28
- Civil township: Meramec
- USGS Quad: Steelville
Name origin
Named for William H. Crawford, U.S. Senator from Georgia
| Year | Population | Percent change |
|---|
| 1830 | 1,712 | -- |
| 1840 | 3,561 | +108.0% |
| 1850 | 6,397 | +79.6% |
| 1860 | 5,823 | -9.0% |
| 1870 | 7,982 | +37.1% |
| 1880 | 10,756 | +34.8% |
| 1890 | 11,961 | +11.2% |
| 1900 | 12,959 | +8.3% |
| 1910 | 13,576 | +4.8% |
| 1920 | 12,355 | -9.0% |
| 1930 | 11,287 | -8.6% |
| 1940 | 12,693 | +12.5% |
| 1950 | 11,615 | -8.5% |
| 1960 | 12,647 | +8.9% |
| 1970 | 14,828 | +17.2% |
| 1980 | 18,300 | +23.4% |
| 1990 | 19,173 | +4.8% |
| 2000 | 22,804 | +18.9% |