| Official Name: | Big Spring |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Missouri#USA |
| Pushpin Label: | Big Spring |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Montgomery |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 8.76 |
| Area Land Km2: | 8.70 |
| Area Water Km2: | 0.06 |
| Area Total Sq Mi: | 3.38 |
| Area Land Sq Mi: | 3.36 |
| Area Water Sq Mi: | 0.03 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 149 |
| Population Density Km2: | 17.13 |
| Population Density Sq Mi: | 44.37 |
| Elevation Ft: | 558 |
| Coordinates: | 38.8025°N -91.4778°W |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 63363 (New Florence) 65041 (Hermann) |
| Blank Name: | FIPS code |
| Blank Info: | 29-05608 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2587054 |
Big Spring is an unincorporated community and census-designated place in Montgomery County, Missouri, United States. As of the 2020 census, it had a population of 149.[2]
A post office called Big Spring was established in 1830 and remained in operation until 1906.[3] The community was named for a big spring near the original town site.[4]
Big Spring is in southern Montgomery County along Missouri Route 19, 8miles south of Interstate 70 at New Florence and the same distance north of Hermann and the Missouri River. The community is in the valley of the Loutre River, a tributary of the Missouri.
According to the U.S. Census Bureau, the Big Spring CDP has a total area of 3.38sqmi, of which 0.03sqmi, or 0.74%, are water.[1]