- Population: 23,344 (Change since 1990: +14.5%)
- Created: August 21, 1813
- County seat: Potosi
- Largest town: Potosi (Pop. 2,662)
- Name origin: George Washington
- Adelbert (Historical)
- Located northeast of Mineral Point along the railroad tracks
- Latitude & Longitude: 37°58'15" N, 90°42'36" W
- Survey: T. 38 N., R. 3 E., Sec. 33
- Elevation: 823
- Civil township: Union
- USGS Quad: Mineral Point (Not shown)
- Anthonies Mill (Unincorporated)
- Located at the intersection Route N and Route W
- Latitude & Longitude: 38°04'47" N, 91°05'10" W
- Civil township: Johnson
- USGS Quad: Anthonies Mill
- Named for Jonas M. Anthony, mill owner
- Sources: Goodspeed (See biographical sketch of Stephen D. Anthony and Crawford Co.)
- Aptus (Unincorporated)
- Located at the end of Route F along Mineral Fork
- Latitude & Longitude: 38°02'25" N, 90°50'54" W
- Survey: T. 38 N., R. 2 E., Sec. 8
- Elevation: 726
- Civil township: Liberty
- School district: Potosi R-3
- USGS Quad: Old Mines
- Baryties (Historical)
- Located on Route CC northwest of Blackwell
- Latitude & Longitude: 38°03'43" N, 90°39'30" W
- Survey: T. 39 N., R. 3 E., Sec. 36
- Elevation: 660
- Civil township: Kingston
- USGS Quad: Tiff
- Baryties is slang for the mineral barite, or
barium sulfate. Barite is derived from the Greek word "barus", meaning
heavy.
- Bates Creek Camp (Unincorporated)
- Located off Route P southwest of Potosi
- Latitude & Longitude: 37°54'22" N, 90°49'17" W
- Survey: T. 37 N., R. 2 E., Sec. 21
- Civil township: Breton
- School district: Potosi R-3
- USGS Quad: Potosi
- Belgrade (Unincorporated)
- Located on Route C near intersection with Route JJ
- Latitude & Longitude: 37°47'12" N, 90°50'57" W
- Elevation: 888
- Civil township: Belgrade
- School district: Valley R-6
- USGS Quad: Belgrade
- Post office: Sept. 6, 1867 - Now
- Bellefontaine (Unincorporated)
- Located on Route E north of Shibboleth
- Latitude & Longitude: 38°01'33" N, 90°42'00" W
- Survey: T. 38 N., R. 3 E., Sec. 9
- Elevation: 810
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff
- Map: 1870 Wash. Co. (Belfontaine)
- Bliss (Unincorporated)
- Located on MO 47 just northwest of intersection with MO 21
- Latitude & Longitude: 38°05'35" N, 90°44'25" W
- Elevation: 643
- Civil township: Kingston
- School district: Kingston K-14
- USGS Quad: Tiff
- Brazil (Unincorporated)
- Located on CR 657 east of Route Y and west of Courtois Creek
- Latitude & Longitude: 37°50'46" N, 91°03'48" W
- Survey: T. 36 N., R. 1 W., Sec. 8
- Civil township: Harmony
- School district: Valley R-6
- USGS Quad: Courtois
- Cadet (Unincorporated)
- Located on MO 47 east of Route E
- Latitude & Longitude: 37°59'15" N, 90°41'18" W
- Survey: T. 38 N., R. 3 E., Sec. 27
- Elevation: 803
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Mineral Point
- Station and siding on the Iron Mountain railroad
- Caledonia (Village)
- Population: 158 (Change since 1990: +11.3%)
- Located at intersection MO 21 and MO 32
- Latitude & Longitude: 37°45'48" N, 90°46'20" W
- Name origin: New Caledonia, Scotland
- Founded: May 15, 1818 by Alex Craighead
- Camp Lakewood (Unincorporated)
- Located along Route AA north of MO 185 on Lake Sunnen
- Latitude & Longitude: 37°56'54" N, 90°55'49" W
- Survey: T. 37 N., R. 1 E., Sec. 4
- Civil township: Walton
- School district: Potosi R-3
- USGS Quad: Shirley
- Cannon Mines (Unincorporated)
- Located on CR 402 (Cannon Mines Road) south of Washington State Park and northeast of Old Mines
- Latitude & Longitude: 38°03'12" N, 90°41'53" W
- Elevation: 794
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff
- Clear Creek (Historical)
- Courtois (Unincorporated)
- Located on Route C near the far southwest corner of Washington County
- Latitude & Longitude: 37°45'53" N, 91°04'19" W
- Survey: T. 35 N., R. 1 W., Sec. 7-8
- Civil township: Harmony
- School district: Valley R-6
- USGS Quad: Courtois
- Cruise Mill (Unincorporated)
- Alternate name: Cruise
- Located near the MO 21 and MO 47 intersection west of Washington State Park
- Latitude & Longitude: 38°04'57" N, 90°43'58" W
- Civil township: Kingston
- School district: Kingston K-14
- USGS Quad: Tiff
- Delbridge (Unincorporated)
- Located on Route C south of Route Z
- Latitude & Longitude: 37°47'41" N, 90°59'12" W
- Survey: T. 36 N., R. 1 W., Sec. 36
- Elevation: 1229
- Civil township: Harmony
- School district: Valley R-6
- USGS Quad: Palmer
- Ebo (Unincorporated)
- Located along MO 185 northwest of Potosi
- Latitude & Longitude: 38°01'35" N, 90°53'57" W
- Survey: T. 38 N., R. 1 E., Sec. 11
- Elevation: 905
- Civil township: Liberty
- School district: Potosi R-3
- USGS Quad: Ebo
- Fertile (Unincorporated)
- Located near MO 21 and Route CC intersection
- Latitude & Longitude: 38°04'26" N, 90°41'08" W
- Elevation: 762
- Civil township: Kingston
- School district: Kingston K-14
- USGS Quad: Tiff
- Map: 1870 Wash. Co.
- Floyd (Historical)
- Located on CR 208 just west of Camp Lakewood
- Latitude & Longitude: 37°57'15" N, 90°56'55" W
- Survey: T. 37 N., R. 1 E., Sec. 5
- Elevation: 877
- Civil township: Walton
- USGS Quad: Shirley (Benchmark shown)
- Fountain Farm (Unincorporated)
- Located just east of Route E north of Mineral Point
- Latitude & Longitude: 37°58'40" N, 90°43'07" W
- Survey: T. 38 N., R. 3 E., Sec. 32
- Elevation: 842
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Mineral Point
- At the end of a spur from the Iron Mountain Line
- Fourche a Renault (Historical)
- Located on MO 185 at the crossing over Fourche a Renault, northwest of Latty
- Latitude & Longitude: 38°00'48" N, 90°52'39" W
- Survey: T. 38 N., R. 1 E., Sec. 13
- Elevation: 728
- Civil township: Liberty
- USGS Quad: Ebo (Benchmark shown)
- French Town (Historical)
- Located along CR 425 northeast of Mineral Point
- Latitude & Longitude: 37°57'18" N, 90°40'28" W
- Survey: T. 37 N., R. 3 E., Sec. 2
- Elevation: 907
- Civil township: Breton
- USGS Quad: Mineral Point (Shows Missionary Church and a cluster of houses)
- Happy Hollow (Unincorporated)
- Located on MO 47 between MO 21 and Route E
- Latitude & Longitude: 38°00'05" N, 90°43'30" W
- Elevation: 876
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff
- Holiday Shores (Unincorporated)
- Subdivision located on a county road near MO 32 in the far southeast corner of Washington County
- Latitude & Longitude: 37°44'21" N, 90°40'28" W
- Survey: T. 35 N., R. 3 E., Sec. 14
- Civil township: Bellevue
- School district: Valley R-6
- USGS Quad: Graniteville
- Hopewell (Unincorporated)
- Previously known as: Hopewell Furnace
- Located at the intersection CR 506 and CR 507 southeast of Potosi
- Latitude & Longitude: 37°53'15" N, 90°42'10" W
- Survey: T. 37 N., R. 3 E., Sec. 33
- Elevation: 858
- Civil township: Breton
- School district: Potosi R-3
- USGS Quad: Mineral Point
- Station on the Iron Mountain Line between Summit and Irondale
- Founded: 1858 by John Evens
- Source: Goodspeed
- Hulsey (Historical)
- Located north of Pea Ridge along MO 185
- Latitude & Longitude: 38°10'49" N, 91°02'12" W
- Survey: T. 40 N., R. 1 W., Sec. 21
- Elevation: 949
- Civil township: Johnson
- USGS Quad: Meramec State Park (Benchmark shown)
- Post office: Jun. 16, 1890-Jan. 31, 1916
- Maps: 1870 Wash. Co. (Shown in Sec. 13) and 1916
- Hunters Mill (Historical)
- Located north of Caledonia near the MO 21 bridge
over Big River
- Latitude & Longitude: 37°49'10" N, 90°46'35" W
- Survey: T. 36 N., R. 2 E., Sec. 24
- Elevation: 830
- Civil township: Concord
- USGS Quad: Belgrade (Not shown)
- Irondale (Fourth-class city)
- Population: 437 (Change since 1990: -7.8%)
- Located on Route M near Route U
- Latitude & Longitude: 37°50'07" N, 90°40'21" W
- Name origin: Iron mining
- Founded: 1858 by John G. Scott
- Ishmael (Historical)
- Located on CR 663 east of Route Y north of Courtois
- Latitude & Longitude: 37°48'22" N, 91°03'24" W
- Survey: T. 36 N., R. 1 W., Sec. 29
- Elevation: 850
- Civil township: Harmony
- USGS Quad: Courtois (Not shown)
- Kingston (Historical)
- Alternate name: Kingston Furnace
- Located north of Old Mines
- Survey: Land Grant #2066 (T. 39 N., R. 3 E.)
- Civil township: Kingston
- Map: 1870 Wash. Co.
- Latty (Unincorporated)
- Located on MO 185 northwest of Potosi
- Latitude & Longitude: 37°59'16" N, 90°51'02" W
- Survey: T. 38 N., R. 2 E., Sec. 30
- Elevation: 815
- Civil township: Liberty
- School district: Potosi R-3
- USGS Quad: Potosi
- Lawson (Historical)
- Alternate name: Lawsons
- Located northeast of Cadet
- Survey: T. 38 N., R. 3 E., Sec. 13
- Maps: 1870 Wash. Co. and 1872
- Levy (Historical)
- Located near the intersection of MO 8 and Route AA west of Shirley
- Latitude & Longitude: 37°54'48" N, 90°56'42" W
- Survey: T. 37 N., R. 1 E., Sec. 20
- Elevation: 1076
- Civil township: Walton
- USGS Quad: Shirley (Not shown)
- Maryden (Unincorporated)
- Located along Route U between Irondale and Bismarck
- Latitude & Longitude: 37°47'47" N, 90°39'45" W
- Survey: T. 36 N., R. 3 E., Sec. 36
- Elevation: 870
- Civil township: Concord
- School district: West St. Francois County R-4
- USGS Quad: Irondale (Not shown)
- Mineral Point (Village)
- Population: 363 (Change since 1990: -5.5%)
- Located near end of Route O east of Potosi
- Latitude & Longitude: 37°56'43" N, 90°43'28" W
- Name origin: minerals
- Founded: 1858 by William C. Inks
- Mud Town (Unincorporated)
- Located on a county road just northeast of Old Mines
- Latitude & Longitude: 38°01'10" N, 90°44'22" W
- Elevation: 841
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff (Not labeled, but does show Mud Town Creek)
- Northcutt (Historical)
- Alternate name: Northcut
- Located along CR 303 (?) east of Pea Ridge
- Latitude & Longitude: 38°07'21" N, 90°57'58" W
- Survey: T. 39 N., R. 1 E., Sec. 7
- Elevation: 658
- Civil township: Johnson
- USGS Quad: Ebo (Not shown)
- Old Mines (Unincorporated)
- Located near southern intersection of MO 21 and MO 47
- Latitude & Longitude: 38°00'55" N, 90°45'21" W
- Elevation: 797
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Old Mines
- Palmer (Historical)
- Previously known as: Webster
- Located on a county road past the end of Route Z
- Latitude & Longitude: 37°50'22" N, 90°59'45" W
- Survey: T. 36 N., R. 1 W., Sec. 13
- Elevation: 901
- Civil township: Harmony
- USGS Quad: Palmer
- Named after the Palmer Lead Company.
- Founded: 1830
- Source: Goodspeed
- Pea Ridge (Unincorporated)
- Located near the end of Route EE
- Latitude & Longitude: 38°07'33" N, 91°02'31" W
- Civil township: Johnson
- School district: Potosi R-3
- USGS Quad: Meramec State Park
- Peoria (Unincorporated)
- Located at the end of Route JJ
- Latitude & Longitude: 37°45'22" N, 90°53'03" W
- Survey: T. 35 N., R. 1 E., Sec. 12
- Civil township: Belgrade
- School district: Valley R-6
- USGS Quad: Palmer
- Potosi (Fourth-class city)
- Population: 2,662 (Change since 1990: -0.8%)
- Located near intersections of MO 8, MO 21, and MO 185
- Latitude & Longitude: 37°56'16" N, 90°46'55" W
- Name origin: Potosi, Bolivia
- Founded: 1813 by Moses Austin
- Quaker (Unincorporated)
- Located on Route C between Courtois and Delbridge
- Latitude & Longitude: 37°46'52" N, 91°00'07" W
- Survey: T. 35 N., R. 1 W., Sec. 2
- Civil township: Harmony
- School district: Valley R-6
- USGS Quad: Courtois
- Racola (Unincorporated)
- Located on MO 21 north of Old Mines
- Latitude & Longitude: 38°01'57" N, 90°45'24" W
- Elevation: 740
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Old Mines
- Named for John Racola Coleman, landowner
- Post office: Apr. 8, 1898 - Jan. 31, 1930
- Source: Ramsay (p. 76)
- Richwoods (Unincorporated)
- Located on Route A just west of MO 47
- Latitude & Longitude: 38°09'37" N, 90°49'41" W
- Elevation: 770
- Civil township: Richwoods
- School district: Richwoods R-7
- USGS Quad: Richwoods
- Post office: May 31, 1844 - Now
- Rockspring (Historical)
- Alternate name: Rock Spring
- Survey: T. 39 N., R. 1 W, Sec. 21
- Civil township: Johnson
- Map: 1870 Wash. Co.
- Shibboleth (Unincorporated)
- Located at intersection Route E and CR 419 just north of MO 47
- Latitude & Longitude: 38°00'20" N, 90°42'19" W
- Survey: T. 38 N., R. 3 E., Sec. 21
- Elevation: 799
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff
- Shirley (Unincorporated)
- Located on MO 8 east of Route AA intersection
- Latitude & Longitude: 37°54'54" N, 90°55'09" W
- Survey: T. 37 N., R. 1 E., Sec. 22
- Elevation: 885
- Civil township: Walton
- School district: Potosi R-3
- USGS Quad: Shirley
- Named for James Shirley, town founder and storeowner.
- Founded: ca. 1895 by James Shirley
- Springtown (Unincorporated)
- Located near intersection MO 8, Route O, and Route U southeast of Potosi
- Latitude & Longitude: 37°55'25" N, 90°45'38" W
- Elevation: 1053
- Civil township: Breton
- School district: Potosi R-3
- USGS Quad: Potosi
- Summit (Unincorporated)
- Alternate name: Summit Switch
- Located on MO 8 east of Potosi
- Latitude & Longitude: 37°54'43" N, 90°42'29" W
- Elevation: 1007
- Civil township: Breton
- School district: Potosi R-3
- USGS Quad: Mineral Point
- Point on the Iron Mountain Line
- Sunlight (Unincorporated)
- Located on CR 636 between Route DD and Route JJ
- Latitude & Longitude: 37°46'54" N, 90°54'18" W
- Survey: T. 35 N., R. 1 E., Sec. 2
- Civil township: Belgrade
- School district: Valley R-6
- USGS Quad: Palmer
- Tiff (Unincorporated)
- Located on CR 408 northeast of Cadet
- Latitude & Longitude: 38°01'09" N, 90°39'10" W
- Civil township: Union
- School district: Kingston K-14
- USGS Quad: Tiff
- Tiff is a slang term for the mineral barite, or barium
sulphate
- Troutt (Unincorporated)
- Located on CR 320 (?) northeast of Ebo
- Latitude & Longitude: 38°02'28" N, 90°53'50" W
- Survey: T. 38 N., R. 1 E., Sec. 11
- Elevation: 840
- Civil township: Liberty
- School district: Potosi R-3
- USGS Quad: Ebo
- Undine (Historical)
- Survey: T. 38 N., R. 1 W., Sec. 28
- Civil township: Johnson
- Map: 1870 Wash. Co.
- White (Historical)
- Located southwest of Cadet near the junction of the Iron Mountain Line and the Pea Ridge Subdivision
- Latitude & Longitude: 37°58'47" N, 90°42'17" W
- Survey: T. 38 N., R. 3 E., Sec. 28
- Elevation: 836
- Civil township: Union
- USGS Quad: Mineral Point (Benchmark shown)
Name origin
Named for George Washington, first US President
| Year | Population | Percent change |
|---|
| 1820 | 3,741 | -- |
| 1830 | 6,784 | +81.3% |
| 1840 | 7,213 | +6.3% |
| 1850 | 8,811 | +22.2% |
| 1860 | 9,723 | +10.4% |
| 1870 | 11,719 | +20.5% |
| 1880 | 12,896 | +10.0% |
| 1890 | 13,153 | +2.0% |
| 1900 | 14,263 | +8.4% |
| 1910 | 13,378 | -6.2% |
| 1920 | 13,803 | +3.2% |
| 1930 | 14,450 | +4.7% |
| 1940 | 17,492 | +21.1% |
| 1950 | 14,689 | -16.0% |
| 1960 | 14,346 | -2.3% |
| 1970 | 15,086 | +5.2% |
| 1980 | 17,983 | +19.2% |
| 1990 | 20,380 | +13.3% |
| 2000 | 23,344 | +14.5% |