The top reported proficiency rate is 77% in English language arts. The lowest is 63% in Science.
Original Research by School Decision on Mosaic Elementary
Mosaic Elementary is a regular public school serving kindergarten through fifth grade in the Mehlville R-IX School District, located in the southern part of St. Louis. The school sits within St. Louis County, an area that is distinct from the independent city of St. Louis. The city itself has a diverse economy with major employers that include the Federal Reserve Bank of St. Louis, Barnes-Jewish Hospital, and several large research universities. Civic and cultural anchors such as Forest Park, the Saint Louis Zoo, and the Gateway Arch are key parts of the region's identity.
The school’s enrollment of roughly 250 students places it on the smaller side for an elementary school. The student body is predominantly white, with a small share of students identifying as two or more races, and even smaller shares identifying as Hispanic, Black, or Asian. A very small percentage of students qualify for free or reduced-price lunch, which can be a rough proxy for economic disadvantage, suggesting that the school serves a relatively affluent population. Data on students with disabilities and English learners were not reported.
On state assessments, the school's performance varies notably by grade and subject. In third grade, roughly two out of three students scored at proficient or above in both math and English language arts. Fourth graders performed at a very high level, with nearly all students reaching proficiency in math and a strong majority doing so in English language arts. Fifth grade results are where a parent will want to dig deeper. In fifth grade math, fewer than half of students scored proficient, a sharp drop from the fourth grade results. Fifth grade English language arts results were not reported, which can sometimes happen due to small group sizes or data suppression. Fifth grade science proficiency landed close to the two-out-of-three mark.
Looking at the school’s standing more broadly, its overall proficiency across all tested subjects and grades places it among the top quarter of schools relative to other districts in St. Louis County. That is a strong signal, though the drop in fifth grade math is a reason for a family to ask the school how it supports students in the upper elementary grades. Because Mosaic is an elementary school, it does not have a graduation rate to report, and chronic absenteeism data was not available. The district did not have recent, publicly reported changes regarding referendums, curriculum shifts, or property tax measures that would be of note to a parent.
The housing market in the surrounding area reflects a modest price point relative to national benchmarks. Home values and rents in the zip code fall below the statewide typical home value, and the county’s median listing price has seen a slight decline over the past year. The St. Louis County market shows a moderate level of supply and demand, with homes spending a little over a month on the market on average. For a family considering a move into the attendance zone, this suggests a market that is active but not overheated, with a range of options.
For a parent evaluating this school, the picture is one of a small, mostly homogeneous elementary school with strong proficiency results through fourth grade, a notable dip in fifth grade math that warrants a conversation with the school, and a very low share of students from economically disadvantaged backgrounds. The school sits within a large St. Louis County district that does not appear to be undergoing major visible changes. A family that values small scale, consistent performance in early elementary years, and a demographic profile that is predominantly white and economically comfortable will likely find this school fits well. A family concerned about how the school addresses the fifth grade transition or supports a wider range of student needs may want to ask more questions.
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