- Located just southeast of St. Clair
- Latitude: 38°20'17" N (+38.3381)
- Longitude: 90°58'11" W (-90.9697)
- Elevation: 748 feet above sea level
- Public Land Survey: T. 42 N., R. 1 W., Sec. 36
- Civil township: Central
- Land area: 0.31 square miles (197.2 acres)
As the crow flies, Parkway is...
| Year | Population | Percent change |
|---|
| 1960 | 222 | -- |
| 1970 | 233 | +5.0% |
| 1980 | 254 | +9.0% |
| 1990 | 277 | +9.1% |
| 2000 | 280 | +1.1% |