Based on third- to fifth-grade 2006 ISATs. For more information, see
| RANK | PERCENTILE | SCHOOL | CITY | DISTRICT |
| 1 | 0.8925 | Blythe Park Elem | RIVERSIDE | RIVERSIDE SCHOOL DIST 96 |
| 2 | 0.8577 | Madison Elem | HINSDALE | C C SCHOOL DIST 181 |
| 3 | 0.8537 | Lincoln Elem | RIVER FOREST | RIVER FOREST SCHOOL DIST 90 |
| 4 | 0.8381 | Highlands Elem | NAPERVILLE | NAPERVILLE C U DIST 203 |
| 5 | 0.8360 | Whittier Elem | WHEATON | COMMUNITY UNIT SCHOOL DIST 200 |
| 5 | 0.8360 | North Barrington Elem | BARRINGTON | BARRINGTON C U SCHOOL DIST 220 |
| 7 | 0.8352 | Prospect Elem | CLARENDON HILLS | C C SCHOOL DIST 181 |
| 7 | 0.8352 | Braeside Elem | HIGHLAND PARK | NORTH SHORE SD 112 |
| 9 | 0.8348 | Longfellow Elem | WHEATON | COMMUNITY UNIT SCHOOL DIST 200 |
| 10 | 0.8327 | Grove Avenue Elem | BARRINGTON | BARRINGTON C U SCHOOL DIST 220 |
| 11 | 0.8306 | Pleasant Hill Elem | PALATINE | PALATINE C C SCHOOL DIST 15 |
| 12 | 0.8230 | Monroe Elem | HINSDALE | C C SCHOOL DIST 181 |
| 13 | 0.8199 | Walker | CLARENDON HILLS | C C SCHOOL DIST 181 |
| 14 | 0.8153 | Cherokee Elem | LAKE FOREST | LAKE FOREST SCHOOL DIST 67 |
| 15 | 0.8115 | Elm Elem | BURR RIDGE | C C SCHOOL DIST 181 |
| 16 | 0.8110 | Adler Park | LIBERTYVILLE | LIBERTYVILLE SCHOOL DIST 70 |
| 17 | 0.8083 | The Lane Elem | HINSDALE | C C SCHOOL DIST 181 |
| 18 | 0.8051 | Westmoor Elem | NORTHBROOK | NORTHBROOK SCHOOL DIST 28 |
| 19 | 0.8046 | Ivy Hall Elementary | BUFFALO GROVE | KILDEER COUNTRYSIDE C C S DIST 96 |
| 20 | 0.8037 | Wiesbrook Elem | WHEATON | COMMUNITY UNIT SCHOOL DIST 200 |
| 21 | 0.8033 | Lincoln Elem | ELMHURST | ELMHURST SCHOOL DIST 205 |
| 22 | 0.8014 | Oak Elem | HINSDALE | C C SCHOOL DIST 181 |
| 23 | 0.8009 | Dewey Elem | EVANSTON | EVANSTON C C SCHOOL DIST 65 |
| 23 | 0.8009 | Marion Jordan Elem | PALATINE | PALATINE C C SCHOOL DIST 15 |
| 25 | 0.7991 | Hough Street Elem | BARRINGTON | BARRINGTON C U SCHOOL DIST 220 |
| 26 | 0.7972 | Ivy Hill Elem | ARLINGTON HEIGHTS | ARLINGTON HEIGHTS SCH DIST 25 |
| 27 | 0.7963 | Prairie Elementary | BUFFALO GROVE | KILDEER COUNTRYSIDE C C S DIST 96 |
| 28 | 0.7939 | Field Park Elem | WESTERN SPRINGS | WESTERN SPRINGS SCHOOL DIST 101 |
| 29 | 0.7934 | Prairie Elem | NAPERVILLE | NAPERVILLE C U DIST 203 |
| 30 | 0.7889 | Half Day | LINCOLNSHIRE | LINCOLNSHIRE-PRAIRIEVIEW S D 103 |
| 31 | 0.7886 | Brook Forest Elem | OAK BROOK | BUTLER SCHOOL DISTRICT 53 |
| 31 | 0.7886 | Arnett C Lines Elem | BARRINGTON | BARRINGTON C U SCHOOL DIST 220 |
| 33 | 0.7874 | Willard Elem | RIVER FOREST | RIVER FOREST SCHOOL DIST 90 |
| 34 | 0.7847 | Roslyn Road Elem | BARRINGTON | BARRINGTON C U SCHOOL DIST 220 |
| 35 | 0.7838 | May Watts Elementary | NAPERVILLE | INDIAN PRAIRIE C U SCH DIST 204 |
| 36 | 0.7818 | Mark Delay | DARIEN | DARIEN SCHOOL DIST 61 |
| 37 | 0.7794 | Walden Elem | DEERFIELD | DEERFIELD SCHOOL DIST 109 |
| 38 | 0.7779 | Thomas Jefferson Elem | HOFFMAN ESTATES | PALATINE C C SCHOOL DIST 15 |
| 39 | 0.7769 | River Woods Elementary | NAPERVILLE | NAPERVILLE C U DIST 203 |
| 40 | 0.7754 | Kildeer Countryside Elem | LONG GROVE | KILDEER COUNTRYSIDE C C S DIST 96 |
| 41 | 0.7734 | Horace Mann Elem | OAK PARK | OAK PARK ELEM SCHOOL DIST 97 |
| 42 | 0.7729 | Fry Elementary | NAPERVILLE | INDIAN PRAIRIE C U SCH DIST 204 |
| 43 | 0.7709 | J W Riley Elem | ARLINGTON HEIGHTS | WHEELING C C SCHOOL DIST 21 |
| 44 | 0.7704 | Robert Clow Elem Sch | NAPERVILLE | INDIAN PRAIRIE C U SCH DIST 204 |
| 44 | 0.7704 | Hunting Ridge Elem | PALATINE | PALATINE C C SCHOOL DIST 15 |
| 46 | 0.7696 | Pleasantdale Elementary | LA GRANGE | PLEASANTDALE SCHOOL DIST 107 |
| 47 | 0.7688 | Lincolnwood Elem | EVANSTON | EVANSTON C C SCHOOL DIST 65 |
| 47 | 0.7688 | Lions Park Elem | MOUNT PROSPECT | MOUNT PROSPECT SCHOOL DIST 57 |
| 49 | 0.7673 | The Joseph Sears | KENILWORTH | KENILWORTH SCHOOL DIST 38 |
| 50 | 0.7668 | Wescott Elementary | NORTHBROOK | NORTHBROOK/GLENVIEW SCH DIST 30 |
| 50 | 0.7668 | John Laidlaw Elem | WESTERN SPRINGS | WESTERN SPRINGS SCHOOL DIST 101 |
| 50 | 0.7668 | Meadow Glens Elementary | NAPERVILLE | NAPERVILLE C U DIST 203 |