| CENTRAL SUFFOLK HOSPITAL | $223,873,729 | $222,098,166 |
| EAST END DISABILITY ASSOCIATES INC | $24,910,564 | $24,001,354 |
| AID TO THE DEVELOPMENTALLY DISABLED INC | $17,371,402 | $15,941,136 |
| TIMOTHY HILL CHILDRENS RANCH INC | $8,828,624 | $8,760,987 |
| RIVERHEAD FREE LIBRARY ASSOCIATION | $4,032,819 | $4,508,420 |
| CENTRAL SUFFOLK HOSPITAL FOUNDATION | $6,798,698 | $1,347,218 |
| RIVERHEAD VOLUNTEER AMBULANCE CORPS INC | $1,246,733 | $1,230,623 |
| RIVERHEAD FDTN FOR MARINE RESEARCH AND PRESERVATION | $817,801 | $785,967 |
| TIMOTHY HILL CHRISTIAN CAMP INC CO TIMOTHY HILL CHILDRENS RANCH | $228,477 | $766,151 |
| RIVERHEAD COMMUNITY AWARENESS PROGRAM INC | $739,948 | $713,870 |
| EAST END ARTS AND HUMANITIES COUNCIL | $678,386 | $692,764 |
| RIVERHEAD CENTRAL FACULTY ASSOC BENEFIT TRUST FUND | $671,083 | $663,108 |
| SUFFOLK COUNTY HISTORICAL SOCIETY | $1,156,261 | $517,386 |
| PLACE FOR LEARNING INC | $161,044 | $433,262 |
| RIVERHEAD CENTRAL FACULTY ASSOC | $436,839 | $430,491 |
| NATIONAL WOMEN BUSINESS OWNERS CORPORATION | $483,561 | $423,239 |
| RIVERHEAD ROTARY CHARITIES INC RONALD FARNWORTH | $160,973 | $361,147 |
| SPIRITS PROMISE EQUINE RESCUE CORP | $366,614 | $338,569 |
| MAUREENS HAVEN INC | $330,838 | $288,965 |
| HALLOCKVILLE INC | $269,902 | $276,510 |
| EEDA FOUNDATION INC | $83,422 | $275,801 |
| LONG ISLAND PINE BARRENS SOCIETY | $328,291 | $259,307 |
| LONG ISLAND WINE COUNCIL | $352,036 | $234,948 |
| EAST END TOURISM ALLIANCE INC | $234,615 | $187,301 |
| RIVERHEAD POLICE BENEVOLENT ASSOCIATION INC | $209,551 | $184,609 |