| Official Name: | Preemption, Illinois |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Illinois#USA |
| Pushpin Label: | Preemption |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Illinois |
| Subdivision Type2: | County |
| Subdivision Name2: | Mercer |
| Subdivision Type3: | Township |
| Subdivision Name3: | Preemption |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 2.88 |
| Area Land Km2: | 2.88 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 1.11 |
| Area Land Sq Mi: | 1.11 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 254 |
| Population Density Km2: | 88.31 |
| Population Density Sq Mi: | 228.83 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 810 |
| Coordinates: | 41.3128°N -90.5844°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 61276 |
| Area Code: | 309 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 416190[3] |
Preemption is an unincorporated community and census-designated place in Preemption Township, Mercer County, Illinois, United States.[4] As of the 2020 census, it had a population of 254.[2] Preemption is 4miles west of Sherrard and has a post office with ZIP code 61276.[5]
Roy James Carver (1909-1981), American philanthropist and businessman, was born in Preemption.[6]