Mountain Valley Middle School

Set in Mexico, Maine, Mountain Valley Middle School is a middle-of-the-pack middle school, part of RSU 10. It instructs 376 students across grades 5 through 8.

RSU 10 comprises 6 schools with combined enrollment of 1,739 students; Mountain Valley Middle School is among them.

Demographically, Mountain Valley Middle School reports that the student body is overwhelmingly White (89%). Beyond that, the school reports 5% Hispanic, 3% multiracial, 2% Black. That composition is broadly in line with Oxford County as a whole.

Looking at school resources, The school currently runs with 32 full-time-equivalent teachers, for a student-teacher ratio near 11.9:1. Statewide, the average ratio sits near 11.2:1, putting Mountain Valley Middle School higher than the state norm the norm. About 77% of enrolled students meet the income threshold for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. Set against Oxford County (around 61%), the school's rate is somewhat above typical.

In the surrounding community, ACS estimates for Oxford County put median household income runs about $60,173, 24% of adults hold a bachelor's degree or higher, and the poverty rate sits near 9%. Mountain Valley Middle School is one of 33 public schools in Oxford County (combined enrollment of about 7,913 students).

Nearest neighbor: Meroby Elementary School, around 0.2 miles off. Within five miles, there are 6 other public schools.

The school occupies a town-based site.

Trend over the last 7 years. Looking back 7 years, enrollment at Mountain Valley Middle School has grew 36%, going from 276 students in 2018 to 376 in 2025. Over the same period, the White share fell from 94% to 89%. The student-to-teacher ratio loosened from 10.7:1 in 2018 to 11.9:1 today.

On this page, the page collects discussion, questions, and updates around enrollment questions, classroom assignments, and PTA news. Parents, students, alumni, and staff are welcome to weigh in.