- Located near the MO 30 crossing of Meramec River near the Jefferson County line
- Latitude: 38°30'47" N (+38.5131)
- Longitude: 90°26'09" W (-90.4358)
- Land area: 6.1 square miles
- Water area: 0.30 square miles (194.9 acres)
As the crow flies, Fenton is...
| Year | Population | Percent change |
|---|
| 1900 | 160 | -- |
| 1910 | 172 | +7.5% |
| 1920 | 146 | -15.1% |
| 1940 | 171 | +17.1% |
| 1950 | 207 | +21.1% |
| 1960 | 207 | None |
| 1970 | 2,275 | +999.0% |
| 1980 | 2,417 | +6.2% |
| 1990 | 3,346 | +38.4% |
| 2000 | 4,360 | +30.3% |