| Place Name | Lamar |
| Place Type | City |
| ZIP Code(s) | 64759 |
| County | Barton County |
| Area Code(s) | 417 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 4,539 |
| Population Growth Rate (2010-19) | -5.87% |
| Majority Ethnicity | White 97.48% |
| US Congressional District(s) | Missouri 4th |
| State House Districts | 127 |
| State Senate Districts | 31 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 97.48% |
| African American | 0.34% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 2.18% |