Schools in Zip Code 99138

ZIP code 99138 includes three small public schools serving grades K–12 in the Inchelium community: Inchelium Elementary School (K–5), Inchelium Middle School (6–8), and Inchelium High School (9–12). Together, they serve 188 students in the small, rural Inchelium School District, where small class sizes and high per-student spending reflect the community’s limited enrollment and geographic isolation.

Inchelium Elementary School is the strongest all-around school compared with district results. In 2025–2026, it exceeded the district in ELA, math, and science, and improved in all three subjects from the previous year. Its 40% math proficiency was close to the state average, while its 4th-grade ELA proficiency reached 60%, above the statewide result for that grade. Inchelium High School is the area’s ELA standout, with 52.94% proficiency—nearly identical to the state overall result. However, its math proficiency was much lower at 29.41%, and its ELA results have varied considerably by year.

Inchelium Middle School is the main academic concern. It had the lowest results in both ELA and math, with 34% and 18% proficiency, respectively, and ranked at the 32nd percentile statewide. Math is the district-wide weakness, particularly in the middle grades, making the transition from elementary to middle school an important focus. All three schools serve many economically disadvantaged students, and student-teacher ratios are low, ranging from 7.9:1 to 14.2:1. Because enrollment is small, yearly percentages can change sharply when only a few students’ results differ. Graduation and dropout figures are from different years and should be interpreted cautiously; current completion data would provide a clearer picture.