Table: 2009 Regents Diplomas
| Year | 2007 | 2008 | 2009 |
| District | % graduates receiving Regents Diplomas | % graduates receiving Regents Diplomas | % graduates receiving Regents Diplomas |
| Nassau | |||
| Baldwin | 90 | 91 | 91 |
| Bellmore-Merrick | 97 | 97 | 96 |
| Bethpage | 97 | 98 | 98 |
| Carle Place | 93 | 91 | 96 |
| East Meadow | 83 | 84 | 88 |
| East Rockaway | 89 | 87 | 82 |
| East Williston | 99 | 98 | 99 |
| Farmingdale | 85 | 81 | 85 |
| Freeport | 76 | 80 | 78 |
| Garden City | 99 | 100 | 98 |
| Glen Cove | 90 | 89 | 91 |
| Great Neck | 96 | 98 | 98 |
| Hempstead | 44 | 45 | 55 |
| Herricks | 94 | 94 | 97 |
| Hewlett-Woodmere | 94 | 92 | 94 |
| Hicksville | 92 | 90 | 91 |
| Island Trees | 88 | 96 | 88 |
| Jericho | 99 | 98 | 99 |
| Lawrence | 84 | 84 | 84 |
| Levittown | 91 | 95 | 93 |
| Locust Valley | 97 | 97 | 99 |
| Long Beach | 86 | 83 | 83 |
| Lynbrook | 98 | 94 | 95 |
| Malverne | 82 | 89 | 84 |
| Manhasset | 95 | 93 | 95 |
| Massapequa | 92 | 93 | 93 |
| Mineola | 87 | 93 | 97 |
| North Shore | 95 | 92 | 95 |
| Oceanside | 94 | 92 | 91 |
| Oyster Bay-East Norwich | 97 | 92 | 88 |
| Plainedge | 93 | 93 | 95 |
| Plainview-Old Bethpage | 95 | 86 | 96 |
| Port Washington | 95 | 92 | 94 |
| Rockville Centre | 97 | 98 | 98 |
| Roosevelt | 34 | 28 | 46 |
| Roslyn | 94 | 97 | 96 |
| Seaford | 99 | 92 | 96 |
| Sewanhaka | 93 | 91 | 93 |
| Syosset | 96 | 96 | 98 |
| Uniondale | 93 | 86 | 84 |
| Valley Stream Central | 92 | 92 | 93 |
| Wantagh | 98 | 99 | 98 |
| West Hempstead | 81 | 84 | 87 |
| Westbury | 69 | 75 | 77 |
| Suffolk | |||
| Amityville | 85 | 82 | 82 |
| Babylon | 98 | 94 | 93 |
| Bay Shore | 88 | 84 | 88 |
| Bayport-Blue Point | 96 | 97 | 95 |
| Brentwood | 82 | 86 | 85 |
| Bridgehampton | 63 | 86 | 47 |
| Center Moriches | 87 | 90 | 94 |
| Central Islip | 79 | 80 | 77 |
| Cold Spring Harbor | 98 | 99 | 100 |
| Commack | 98 | 95 | 97 |
| Comsewogue | 89 | 91 | 89 |
| Connetquot | 92 | 93 | 91 |
| Copiague | 81 | 78 | 83 |
| Deer Park | 90 | 91 | 90 |
| East Hampton | 90 | 89 | 85 |
| East Islip | 97 | 97 | 97 |
| Eastport-South Manor | 90 | 90 | 88 |
| Elwood | 92 | 94 | 97 |
| Fishers Island | 90 | 90 | 100 |
| Greenport | 83 | 79 | 72 |
| Half Hollow Hills | 94 | 93 | 95 |
| Hampton Bays | 91 | 84 | 77 |
| Harborfields | 95 | 93 | 95 |
| Hauppauge | 94 | 96 | 95 |
| Huntington | 85 | 78 | 84 |
| Islip | 98 | 99 | 98 |
| Kings Park | 89 | 89 | 93 |
| Lindenhurst | 91 | 95 | 93 |
| Longwood | 82 | 84 | 82 |
| Mattituck-Cutchogue | 96 | 96 | 93 |
| Middle Country | 98 | 80 | 85 |
| Miller Place | 96 | 94 | 92 |
| Mount Sinai | 97 | 95 | 94 |
| North Babylon | 84 | 82 | 85 |
| Northport-East Northport | 93 | 96 | 96 |
| Patchogue-Medford | 87 | 87 | 84 |
| Port Jefferson | 99 | 96 | 97 |
| Riverhead | 91 | 85 | 88 |
| Rocky Point | 89 | 93 | 90 |
| Sachem | 88 | 88 | 88 |
| Sag Harbor | 95 | 92 | 88 |
| Sayville | 93 | 91 | 95 |
| Shelter Island | 100 | 100 | 95 |
| Shoreham-Wading River | 93 | 92 | 91 |
| Smithtown | 96 | 96 | 97 |
| South Country | 75 | 74 | 81 |
| South Huntington | 84 | 91 | 90 |
| Southampton | 80 | 79 | 85 |
| Southold | 88 | 100 | 91 |
| Three Village | 93 | 96 | 97 |
| West Babylon | 90 | 91 | 92 |
| West Islip | 95 | 91 | 93 |
| Westhampton Beach | 97 | 95 | 89 |
| William Floyd | 80 | 85 | 83 |
| Wyandanch | 89 | 65 | 72 |
| Averages | |||
| Nassau | 90.4 | 90.5 | 91.4 |
| Suffolk | 89.8 | 89.3 | 89.7 |
| Long Island | 90.1 | 89.9 | 90.5 |
