| Official Name: | Mier, Indiana |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Mier |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Grant |
| Subdivision Type3: | Township |
| Subdivision Name3: | Richland |
| Area Total Km2: | 0.62 |
| Area Land Km2: | 0.62 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 67 |
| Population Density Km2: | 108.12 |
| Coordinates: | 40.5747°N -85.8233°W |
| Elevation Ft: | 833 |
| Postal Code Type: | ZIP code |
| Postal Code: | 46919[1] |
| Area Code: | 765 |
| Blank Name: | FIPS code |
| Blank Info: | 18-49212 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2583459 |
| Unit Pref: | Imperial |
| Area Footnotes: | [2] |
| Area Total Sq Mi: | 0.24 |
| Area Land Sq Mi: | 0.24 |
| Area Water Sq Mi: | 0.00 |
| Population Density Sq Mi: | 280.33 |
Mier is an unincorporated community and census-designated place (CDP) in Richland Township, Grant County, Indiana, in the United States. As of the 2010 census it had a population of 78.[3]
The community was named after Ciudad Mier, in Mexico.[4] A post office was established at Mier in 1849, and remained in operation until it was discontinued in 1928.[5]
Mier is located in northwestern Grant County, crossed by State Roads 13, 18, and 19. State Road 18 leads east 3miles to Sweetser and west to Converse, while State Road 13 leads north to Somerset and south to Swayzee. State Road 19 follows State Road 13 south from Mier and State Road 18 west from it. Marion, the Grant County seat, is 9miles to the east via State Road 18.
According to the U.S. Census Bureau, the Mier CDP has an area of 0.6sqkm, all of it land.[3]