| KOST |
| Name | State | Number of records |
| KOST: LYDIA, ALVIN, EMIL | South Dakota | 42 |
| KOST: ALICE, WILLIAM, ANNA | Minnesota | 40 |
| KOST: JOSEPH, WILLIAM, GEORGE | New York | 61 |
| MARY KOST | | 43 |
| KOST: WILLIAM, ANNA, EDWARD | Illinois | 74 |
| JOHN KOST | | 62 |
| KOST: KENNETH, SADIE, ANDREW | Indiana | 38 |
| KOST: ANDREW, EDWARD, ANNE | Connecticut | 29 |
| KOST: EDWARD, EVELYN, ELIZABETH | California | 45 |
| KOST born in 1914 | | 27 |
| KOST: FRANK, STEPHEN, MARTHA | Florida | 40 |
| KOST born in 1915 | | 23 |
| KOST: MICHAEL, CHARLES, GEORGE | New Jersey | 36 |
| KOST born in 1918 | | 23 |
| KOSTKA: FRANK, JAMES, HELEN | Illinois | 78 |
| KOSTKA: FRANK, STANLEY, JOSEPHINE | Massachusetts | 33 |
| KOSTKA: ANNA, GEORGE, FRANK | Wisconsin | 70 |
| JOSEPH KOSTKA | | 32 |
| KOSTLAN: CHARLES, GEORGE, EDWARD | | 34 |
| KOSTMAN: CARL, DAVID, ELMER | | 78 |
| KOSTNER: JOSEPH, LEROY, ANNA | Illinois | 36 |
| KOSTREBA: JOSEPH, JOHN, FRANK | | 45 |
| KOSTREVA: EDWARD, STANLEY, MINNIE | | 57 |
| KOSTRO: JOSEPH, JOHN, FRANK | | 81 |
| KOSTRUB: JOHN, ANDREW, GEORGE | | 43 |
| KOSTRZEWA: JOSEPH, FRANCES, JOHN | Michigan | 33 |
| JOSEFIN : SCHROEDER, GARCIA, REDZEPOVIC | | 25 |
| KOSTRZEWA: JOHN, JOSEPHINE, ANNA | | 97 |
| KOSTRZEWSKI: JOHN, HELEN, STANLEY | | 114 |
| KOSTUCH: JOHN, THOMAS, MARIE | | 73 |
| KOSTUCK: JOSEPH, FRANCES, EDWIN | | 54 |
| KOSTUK: ANNA, MICHAEL, PETER | | 43 |
| KOSTUR: JOSEPH, JOHN, ANDREW | | 68 |
| KOSTURA: JOHN, ANNA, MICHAEL | | 100 |
| KOSTURKO: WILLIAM, DAVID, MICHAEL | | 36 |
| KOSTUS: STANLEY, MARY, OLGA | | 25 |
| KOSTYAL: JOHN, FRANK, MARY | | 51 |
| KOSTYK: JOHN, MICHAEL, JOSEPH | | 94 |
| ADELA J: CALLES, HINTZ, DIXON | | 47 |
| KOSTYO: JOHN, STEVE, MARY | | 63 |
| KOSTYRA: JEAN, EDWARD, JOHN | | 29 |
| KOSTYSHAK: THEODOSIA, IVAN, WASILY | | 20 |
Based on public records. Inadvertent errors are possible.
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