| Business | Phone |
| Ad Astra Consulting 274 Sw 20th Ln, Lamar 64759 | (417) 681-0889 |
| Lamar Alternative School 405 Walnut St, Lamar 64759 | (417) 682-2411 |
| Lamar East Primary 1600 E 12th, Lamar 64759 | (417) 681-0613 |
| Lamar Elementary School 600 Walnut St, Lamar 64759 | (417) 682-3567 |
| Lamar High School 503 Maple St, Lamar 64759 | (417) 682-5571 |
| Lamar Middle School 202 W 7th St, Lamar 64759 | (417) 682-3548 |
| Lamar Superintendent-Schools 202 W 7th St, Lamar 64759 | (417) 682-3527 |