- Location: Jefferson County, Missouri
- Legal status: Third-class city
- Population: 9,660 (Change since 1990: +19.2%)
- Previously known as: Tanglefoot and Limitville
- Latitude: 38°13'14" N (+38.2206)
- Longitude: 90°23'45" W (-90.3958)
- Civil township: River View
- Land area: 4.8 square miles
As the crow flies, Festus is...
| Year | Population | Percent change |
|---|
| 1900 | 1,256 | -- |
| 1910 | 2,556 | +103.5% |
| 1920 | 3,348 | +31.0% |
| 1940 | 4,620 | +38.0% |
| 1950 | 5,199 | +12.5% |
| 1960 | 7,021 | +35.0% |
| 1970 | 7,530 | +7.2% |
| 1980 | 7,574 | +0.6% |
| 1990 | 8,105 | +7.0% |
| 2000 | 9,660 | +19.2% |