- Population: 15,342 (Change since 1990: +9.5%)
- Created: November 25, 1820
- County seat: Hermann
- Largest town: Hermann (Pop. 2,674)
- Bay (Unincorporated)
- Located at the junction of Route K and Route W
- Latitude & Longitude: 38°30'30" N, 91°33'30" W
- Survey: T. 43 N., R. 5 W., Sec. 6
- Civil township: Boulware
- USGS Quad: Pershing
- Bem (Unincorporated)
- Located on MO 19 south of Owensville
- Latitude & Longitude: 38°15'57" N, 91°28'11" W
- Elevation: 836
- Civil township: Brush Creek
- USGS Quad: Owensville East
- Bland (Fourth-class city)
- Population: 565 (Change since 1990: -13.2%)
- Located on MO 28 near the Osage County line
- Latitude & Longitude: 38°18'06" N, 91°37'58" W
- Brown Shanty (Unincorporated)
- Located at the end of CR 227 on the Gasconade
River
- Latitude & Longitude: 38°33'04" N, 91°34'28" W
- Civil township: Boulware
- USGS Quad: Pershing
- Canaan (Unincorporated)
- Located on MO 28 between Bland and Owensville
- Latitude & Longitude: 38°18'44" N, 91°33'32" W
- Elevation: 1047
- Civil township: Clay
- USGS Quad: Owensville West
- Cave Hill (Historical)
- Latitude & Longitude: 38°29'05" N, 91°33'06" W
- Survey: T. 43 N., R. 6 W., Sec. 12
- Elevation: 620
- Civil township: Boulware
- USGS Quad: Goerlisch Ridge
- Charlotte (Historical)
- Cleavesville (Unincorporated)
- Located on Route CC southeast of Bland
- Latitude & Longitude: 38°16'22" N, 91°36'06" W
- Elevation: 901
- Civil township: Clay
- USGS Quad: Owensville West
- Drake (Unincorporated)
- Located at the junction of US 50, MO 19, and Route ZZ
- Latitude & Longitude: 38°28'06" N, 91°27'52" W
- Elevation: 868
- Civil township: Boeuf
- USGS Quad: Rosebud
- Fredericksburg (Unincorporated)
- Located on Route J at the Gasconade County line
- Latitude & Longitude: 38°36'27" N, 91°38'29" W
- Survey: T. 45 N., R. 6 W., Sec. 31
- Civil township: Richland
- USGS Quad: Fredericksburg
- Gasconade (Fourth-class city)
- Population: 267 (Change since 1990: +5.5%)
- Located near the MO 100 bridge over the Gasconade River
- Latitude & Longitude: 38°40'10" N, 91°33'36" W
- Hermann (Fourth-class city)
- Population: 2,674 (Change since 1990: -2.9%)
- Latitude & Longitude: 38°42'15" N, 91°26'14" W
- Leduc (Historical)
- Latitude & Longitude: 38°11'57" N, 91°35'36" W
- Survey: T. 40 N., R. 6 W., Sec. 16
- Elevation: 890
- Civil township: Bourbois
- USGS Quad: Redbird
- Little Berger (Historical)
- Latitude & Longitude: 38°37'17" N, 91°23'39" W
- Survey: T. 45 N., R. 4 W., Sec. 29
- Civil township: Roark
- USGS Quad: Swiss
- Morrison (Fourth-class city)
- Population: 123 (Change since 1990: -23.1%)
- Located on MO 100 at the Osage County line
- Latitude & Longitude: 38°40'22" N, 91°38'10" W
- Mount Sterling (Unincorporated)
- Located near the US 50 bridge over Gasconade River
- Latitude & Longitude: 38°27'54" N, 91°37'37" W
- Survey: T. 43 N., R. 6 W., Sec. 19
- Elevation: 591
- Civil township: Boulware
- USGS Quad: Cooper Hill
- New Woollam (Unincorporated)
- Located on Route Y northwest of Owensville and southwest
of Old Woollam
- Latitude & Longitude: 38°22'37" N, 91°34'22" W
- Civil township: Third Creek
- USGS Quad: Goerlisch Ridge
- Old Bland (Unincorporated)
- Located on Route A just north of Bland
- Latitude & Longitude: 38°18'54" N, 91°37'22" W
- Civil township: Clay
- USGS Quad: Owensville West
- Old Woollam (Unincorporated)
- Located on Route P northwest of Owensville and northeast of New Woollam
- Latitude & Longitude: 38°23'34" N, 91°33'12" W
- Survey: T. 42 N., R. 6 W., Sec. 12
- Elevation: 762
- Civil township: Third Creek
- USGS Quad: Goerlisch Ridge
- Owensville (Fourth-class city)
- Population: 2,500 (Change since 1990: +7.5%)
- Located near the junctions of MO 19 and MO 28
- Latitude & Longitude: 38°20'44" N, 91°30'05" W
- Pershing (Unincorporated)
- Previously known as: Potsdam
- Located at the end of Route OO southeast of Fredericksburg
- Latitude & Longitude: 38°34'38" N, 91°36'51" W
- Survey: T. 44 N., R. 6 W., Sec. 8
- Civil township: Richland
- USGS Quad: Pershing
- Red Bird (Unincorporated)
- Alternate name: Redbird
- Located just off Route B near the Phelps County line
- Latitude & Longitude: 38°10'54" N, 91°34'13" W
- Civil township: Bourbois
- USGS Quad: Redbird
- Rosebud (Fourth-class city)
- Population: 364 (Change since 1990: -4.2%)
- Located on US 50 between Owensville and Gerald
- Latitude & Longitude: 38°23'14" N, 91°24'03" W
- Stolpe (Historical)
- Latitude & Longitude: 38°38'36" N, 91°35'37" W
- Survey: T. 45 N., R. 6 W., Sec. 21
- Elevation: 540
- Civil township: Richland
- USGS Quad: Gasconade
- Stony Hill (Unincorporated)
- Located at the junction of Route E and Route H near the
Franklin County line
- Latitude & Longitude: 38°32'34" N, 91°22'25" W
- Survey: T. 44 N., R. 4 W., Sec. 21
- Civil township: Boeuf
- USGS Quad: Dissen
- Swiss (Unincorporated)
- Located on MO 19 near the intersections with Route F and Route NN
- Latitude & Longitude: 38°33'46" N, 91°28'16" W
- Survey: T. 44 N., R. 5 W., Sec. 15
- Civil township: Boeuf
- USGS Quad: Swiss
- Tea (Unincorporated)
- Located on Route T south of the junction with Route V
- Latitude & Longitude: 38°17'60" N, 91°23'47" W
- Civil township: Canaan
- USGS Quad: Owensville East
- Vieman (Historical)
- Latitude & Longitude: 38°12'07" N, 91°28'45" W
- Survey: T. 40 N., R. 5 W., Sec. 15
- Elevation: 922
- USGS Quad: Oak Hill
- Named for Lorenzo D. Vieman, postmaster
- Source: Breuer (p. 111)
- Wiffenberg (Historical)
- Latitude & Longitude: 38°27'37" N, 91°25'53" W
- Survey: T. 43 N., R. 5 W., Sec. 24
- Civil township: Boeuf
- USGS Quad: Rosebud
| Year | Population | Percent change |
|---|
| 1830 | 1,545 | -- |
| 1840 | 5,330 | +245.0% |
| 1850 | 4,996 | -6.3% |
| 1860 | 8,727 | +74.7% |
| 1870 | 10,093 | +15.7% |
| 1880 | 11,153 | +10.5% |
| 1890 | 11,706 | +5.0% |
| 1900 | 12,298 | +5.1% |
| 1910 | 12,847 | +4.5% |
| 1920 | 12,381 | -3.6% |
| 1930 | 12,172 | -1.7% |
| 1940 | 12,414 | +2.0% |
| 1950 | 12,342 | -0.6% |
| 1960 | 12,195 | -1.2% |
| 1970 | 11,878 | -2.6% |
| 1980 | 13,181 | +11.0% |
| 1990 | 14,006 | +6.3% |
| 2000 | 15,342 | +9.5% |