- Location: Franklin County, Missouri
- Legal status: Fourth-class city
- Population: 6,351 (Change since 1990: +12.2%)
- Founded: 1859 by Stephen Sullivan
- Name origin: Stephen Sullivan
- Located near I-44 next to the Crawford County line
- Latitude: 38°12'29" N (+38.2081)
- Longitude: 91°09'37" W (-91.1603)
- Elevation: 987 feet above sea level
- Public Land Survey: T. 40 N., R. 2 W., Sec. 9
- Civil township: Meramec
- Land area: 7.7 square miles
As the crow flies, Sullivan is...
Name origin
Named for Stephen Sullivan, founder
| Year | Population | Percent change |
|---|
| 1900 | 714 | -- |
| 1910 | 934 | +30.8% |
| 1920 | 909 | -2.7% |
| 1930 | 2,013 | +121.5% |
| 1940 | 2,517 | +25.0% |
| 1950 | 3,019 | +19.9% |
| 1960 | 4,098 | +35.7% |
| 1970 | 5,111 | +24.7% |
| 1980 | 5,461 | +6.8% |
| 1990 | 5,661 | +3.7% |
| 2000 | 6,351 | +12.2% |