Summary:
Zip code 30066 in Marietta, Georgia, is home to four middle schools—Mabry Middle School, Daniell Middle School, Simpson Middle School, and McCleskey Middle School—all serving grades 6–8 within the Cobb County School District, a district ranked in the 71st percentile statewide.
This zip code presents a clear two-tier picture. Simpson Middle School is the standout academic leader, ranking 23rd in Georgia (96th percentile, 5 stars) and improving from 41st last year. Mabry Middle School is close behind at 35th (94th percentile, 5 stars), with both schools holding 5-star ratings for three consecutive years. At the other end, Daniell Middle School ranks 191st (67th percentile, 3 stars) and is the only school in the group with a 3-star rating, while McCleskey Middle School sits in the middle at 140th (76th percentile, 4 stars).
Key differences emerge in attendance and resources. Daniell’s chronic absenteeism rate of 18.5% is more than double that of Mabry (7.5%) and Simpson (7.9%), and it exceeds the state average. McCleskey spends significantly more per student ($18,163) and has the lowest student-teacher ratio (12.5:1), yet its test scores lag behind the top two schools. Academically, all four schools achieve near-perfect proficiency on the Algebra I End-of-Course exam (96.8–100%), far above the district average of 59.4%. Simpson excels in 8th-grade social studies (80.7% proficiency), while Mabry leads in 8th-grade math (81.3%). Daniell, despite struggles in most subjects, posts a strong 82.9% in high school physical science. Overall, families in this zip code can expect strong performance relative to state averages, but with a notable gap between the top-performing Mabry and Simpson and the lower-performing McCleskey and Daniell.
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