Districts in Penobscot County21 districts, sorted by rating
| District | City | Rating | Zip Codes |
|---|---|---|---|
| Dedham | Holden | 10/10 Excellent · 96th pct | 1 |
| Regional School Unit 26 | Orono | 9/10 Excellent · 85th pct | 2 |
| Regional School Unit 22 | Frankfort | 9/10 Excellent · 84th pct | 3 |
| Milford | Milford | 8/10 Good · 74th pct | 1 |
| School Administrative District 31 | Howland | 8/10 Good · 74th pct | 3 |
| School Administrative District 63 | Eddington | 8/10 Good · 73rd pct | 1 |
| Orrington | Orrington | 8/10 Good · 70th pct | 1 |
| Brewer | Brewer | 7/10 Good · 70th pct | 1 |
| Bangor School Department | Bangor | 7/10 Good · 68th pct | 1 |
| School Administrative District 23 | Carmel | 5/10 Average · 47th pct | 2 |
| School Administrative District 30 | Lee | 5/10 Average · 42nd pct | 3 |
| Regional School Unit 34 | Bradley | 4/10 Below Average · 38th pct | 3 |
| Regional School Unit 67 | Lincoln | 4/10 Below Average · 30th pct | 1 |
| School Administrative District 64 | Bradford | 3/10 Below Average · 28th pct | 5 |
| Regional School Unit 19 | Etna | 3/10 Below Average · 25th pct | 8 |
| School Administrative District 46 | Exeter | 3/10 Below Average · 23rd pct | 3 |
| Medway | Medway | 2/10 Poor · 11th pct | 1 |
| East Millinocket | East Millinocket | 2/10 Poor · 10th pct | 1 |
| School Administrative District 41 | Brownville Junction | 1/10 Poor · 8th pct | 2 |
| Burlington Public Schools | Burlington | 1/10 Poor · 3rd pct | 1 |
| Reed Plantation | Wytopitlock | Not rated | 1 |
Zip Codes in Penobscot County
School Districts in Penobscot County, Maine
Penobscot County has 21 public school districts covering 45 zip codes. The top-rated district in Penobscot County is Dedham (10/10). Ratings are based on the share of students proficient in reading and math on state assessments (NCES EDFacts, 2021–22 for most districts), ranked against all districts in Maine. Directory details come from NCES CCD 2024–25.
Enter your zip code on any page to confirm your exact district assignment — district boundaries are address-specific and may not follow county or city lines.