| Kingdom WorkersEIN 39-1656073 | Religion | WI | $2,650,173Small | 87.82 |
| Kingsway CharitiesEIN 54-1668650 | International | VA | $67,067,697Large | 71.53 |
| Kinship UnitedEIN 36-4395095 | International | IL | $4,086,912Mid-sized | 89.39 |
| Kips Bay Boys & Girls ClubEIN 13-1623850 | Human Services | NY | $10,133,079Mid-sized | 90.39 |
| Kishwaukee Family YMCAEIN 36-2379643 | Human Services | IL | $3,529,997Mid-sized | 82.77 |
| KivaEIN 71-0992446 | International | CA | $17,714,851Large | 91.60 |
| Kiwanis Children's FundEIN 36-6072039 | International | IN | $6,836,127Mid-sized | 90.54 |
| KIXE-TVEIN 94-1569300 | Arts, Culture, Humanities | CA | $1,476,890Small | 85.09 |
| Knox Area Rescue MinistriesEIN 62-0670972 | Human Services | TN | $16,352,777Large | 89.48 |
| Knoxville Opera CompanyEIN 62-1015262 | Arts, Culture, Humanities | TN | $1,564,890Small | 73.58 |
| Knoxville Zoological GardensEIN 62-1034633 | Animals | TN | $11,148,856Mid-sized | 86.00 |
| KNPBEIN 88-0172215 | Arts, Culture, Humanities | NV | $4,049,715Mid-sized | 89.18 |
| Koahnic Broadcast CorporationEIN 92-0139738 | Arts, Culture, Humanities | AK | $2,479,153Small | 87.62 |
| KOCE-TV Foundation/PBS SoCalEIN 95-3220724 | Arts, Culture, Humanities | CA | $18,180,419Large | 93.42 |
| Kohl Children's Museum of Greater ChicagoEIN 36-3706878 | Arts, Culture, Humanities | IL | $4,802,705Mid-sized | 86.88 |
| Koinonia HouseEIN 23-7292636 | Religion | ID | $2,106,344Small | 71.76 |
| Kokomo Rescue MissionEIN 35-1104430 | Human Services | IN | $2,559,798Small | 88.60 |
| Kolel Chibas JerusalemEIN 13-5655181 | Human Services | NY | $5,312,170Mid-sized | 65.97 |
| Kolel Shomre Hachomos of JerusalemEIN 13-5562271 | Human Services | NY | $8,897,808Mid-sized | 59.57 |
| Kostopulos Dream FoundationEIN 87-6125177 | Human Services | UT | $1,588,652Small | 100.00 |
| Kōkua Hawaiʻi FoundationEIN 20-0315475 | Education | CA | $727,147Small | 69.49 |
| KQEDEIN 94-1241309 | Arts, Culture, Humanities | CA | $81,269,351Large | 91.32 |
| KSBJ Educational FoundationEIN 74-2162248 | Religion | TX | $11,508,571Mid-sized | 90.60 |
| KSMQEIN 68-0599645 | Arts, Culture, Humanities | MN | $1,940,862Small | 78.12 |
| KUOW Puget Sound Public RadioEIN 91-2079402 | Arts, Culture, Humanities | WA | $15,559,350Large | 93.31 |
| KVIEEIN 94-1421463 | Arts, Culture, Humanities | CA | $10,941,160Mid-sized | 86.34 |
| La Casa de las MadresEIN 94-2330864 | Human Services | CA | $2,590,639Small | 86.81 |
| La Comunidad Hispana (LCH)EIN 23-2041915 | Health | PA | $5,092,573Mid-sized | 99.95 |
| La Jolla Music SocietyEIN 23-7148171 | Arts, Culture, Humanities | CA | $4,368,421Mid-sized | 85.59 |
| La Jolla PlayhouseEIN 95-1941117 | Arts, Culture, Humanities | CA | $19,706,336Large | 87.34 |
| La Leche League InternationalEIN 36-2514518 | Human Services | NC | $938,688Small | 72.36 |
| LA OperaEIN 95-2096402 | Arts, Culture, Humanities | CA | $42,265,305Large | 87.42 |
| LA Promise FundEIN 20-4562686 | Education | CA | $5,769,247Mid-sized | 93.65 |
| Lackey ClinicEIN 54-1850915 | Health | VA | $9,322,438Mid-sized | 91.31 |
| Laguna Art MuseumEIN 33-0717157 | Arts, Culture, Humanities | CA | $2,339,192Small | 73.10 |
| Lake Area United WayEIN 23-7170019 | Community Development | IN | $3,382,305Small | 75.74 |
| Lake Erie Nature & Science CenterEIN 34-0845030 | Arts, Culture, Humanities | OH | $1,414,666Small | 92.23 |
| Lakeland Public TelevisionEIN 41-1265701 | Arts, Culture, Humanities | MN | $2,788,423Small | 87.20 |
| Lakeland Volunteers in MedicineEIN 52-2351630 | Health | FL | $1,812,580Small | 81.96 |
| Lakeshore Habitat for HumanityEIN 38-2893355 | Community Development | MI | $2,460,211Small | 88.18 |
| Lakeview Cemetery FoundationEIN 34-1429875 | Arts, Culture, Humanities | OH | $1,539,223Small | 81.69 |
| Lakeview PantryEIN 36-2734184 | Human Services | IL | $5,200,543Mid-sized | 87.11 |
| Lamb & Lion MinistriesEIN 75-1717049 | Religion | TX | $3,036,788Small | 95.95 |
| Lambda LegalEIN 23-7395681 | Human and Civil Rights | NY | $3,373,779Small | 81.46 |
| LancasterHistory.orgEIN 23-1365154 | Arts, Culture, Humanities | PA | $2,255,715Small | 76.17 |
| Land Stewardship ProjectEIN 41-1466054 | Environment | MN | $2,524,386Small | 87.93 |
| LAND studioEIN 34-1212421 | Environment | OH | $3,900,114Mid-sized | 86.27 |
| Land Trust AllianceEIN 04-2751357 | Environment | DC | $15,111,306Large | 90.85 |
| LandesaEIN 91-1158970 | International | WA | $12,473,980Mid-sized | 94.59 |
| Landmark Legal FoundationEIN 51-0203802 | Human and Civil Rights | VA | $1,800,533Small | 69.76 |
| Landmark on Main StreetEIN 11-2444833 | Arts, Culture, Humanities | NY | $1,510,616Small | 91.18 |
| Lange FoundationEIN 95-4407687 | Animals | CA | $1,705,600Small | 96.22 |
| Langham PartnershipEIN 23-7417198 | Religion | AZ | $4,124,812Mid-sized | 81.10 |
| Lankenau Institute for Medical ResearchEIN 23-2175659 | Health | PA | $16,847,810Large | 81.99 |
| Lantern HouseEIN 87-0368808 | Human Services | UT | $2,766,907Small | 76.66 |
| Larkin Street Youth ServicesEIN 94-2917999 | Human Services | CA | $18,597,674Large | 90.64 |
| Las Vegas Rescue MissionEIN 23-7222330 | Human Services | NV | $5,012,654Mid-sized | 82.74 |
| Last Chance for AnimalsEIN 95-4013155 | Animals | CA | $2,442,653Small | 98.23 |
| Latin American AssociationEIN 58-1237316 | Human Services | GA | $3,759,451Mid-sized | 91.05 |
| Latino Health AccessEIN 33-0562943 | Human Services | CA | $2,557,543Small | 85.02 |