Summary:
ZIP code 53150 in Muskego, Wisconsin, has two elementary schools—Bay Lane Elementary (PK–4) and Mill Valley Elementary (K–4)—both in the Muskego-Norway School District. Together they serve about 1,329 elementary students. The district is ranked #23 of 432 districts in Wisconsin (95th percentile, 5 stars). No test scores in this data set are suppressed; all proficiency figures shown are exact percentages.
Mill Valley is the current achievement standout. It ranks #37 of 1,039 elementary schools statewide in 2025–26 (96th percentile, 5 stars), with an average proficiency of 81.72% across the six reported tests, compared with Bay Lane’s 76.32% and the state’s 55.42%. Mill Valley leads in 3rd-grade ELA, 4th-grade ELA, 4th-grade Social Studies, and 4th-grade Science. Bay Lane, ranked #102 of 1,039 (90th percentile, 5 stars), leads in both math tests: 3rd-grade math 82.89% vs. 79.31%, and 4th-grade math 82.86% vs. 80.43%. From 2024–25 to 2025–26, Mill Valley improved its average by +3.04 points, while Bay Lane declined by −2.75 points; Mill Valley improved in five of six tests, Bay Lane declined in three of six.
Both schools have exceptionally low chronic absenteeism: Bay Lane 4.8% and Mill Valley 4.3%, versus 8.9% districtwide and 17.3% statewide. Mill Valley enrolls 417 students vs. Bay Lane’s 912, has a lower student-teacher ratio (12.9 vs. 14.9), and spends more per student ($16,683 vs. $15,054). Their free/reduced lunch rates are nearly identical: Mill Valley 13.19% and Bay Lane 12.72%. Overall, both are high-performing; Mill Valley is the current overall leader, while Bay Lane is a large school with standout math and very low absenteeism. The main watch item is Bay Lane’s 2025–26 decline in 4th-grade ELA and Social Studies.
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