| COSTI |
| Name | State | Number of records |
| COSTI: FRANK, CLAIRE, VICTORIA | | 52 |
| COSTIC: JOHN, JOSEPH, HELEN | | 58 |
| COSTICH: THOMAS, MARGARET, CHARLES | | 69 |
| COSTICK: JOSEPH, JOHN, MIKE | | 60 |
| ELVERA K: NELSON, SCROGGS, SNODGRASS | | 28 |
| COSTIGAN: EDWARD, ELLEN, ALICE | New Jersey | 51 |
| JAMES COSTIGAN | | 36 |
| JOHN COSTIGAN | | 68 |
| WILLIAM COSTIGAN | | 42 |
| COSTIGAN: ALBERT, BARBARA, ALICE | Rhode Island | 25 |
| ELLIOT R: BROWN, HIRNSCHALL, GASPARD | | 42 |
| MARY COSTIGAN | | 31 |
| COSTIGAN: EDWARD, ELIZABETH, ANNE | New York | 51 |
| COSTIGAN: LAURENCE, MARIE, MARGUERITE | California | 42 |
| COSTIGAN: CATHERINE, ANNA, DANIEL | Pennsylvania | 35 |
| COSTIGAN: EDWARD, FRANK, FRANCIS | Illinois | 34 |
| STELLA N: PHILLIPS, DAVIS, SMITH | | 100 |
| COSTIGAN: GEORGE, MARGARET, HUBERT | Massachusetts | 38 |
| COSTIGAN: ANN, BEATRICE, ALBERT | Florida | 29 |
| THORNTON J: WATSON, SKROCH, BROWN | | 46 |
| COSTILL: ROBERT, HAROLD, RAYMOND | | 52 |
| COSTILLO: MARCOS, FRANK, ELTON | | 45 |
| COSTILOW: JAMES, MARY, THOMAS | | 116 |
| COSTIN: JAMES, JOSEPH, CARVEL | Indiana | 43 |
| COSTIN: JOHN, RUTH, EDWARD | New York | 29 |
| COSTIN: IRENE, MAMIE, ALBERT | North Carolina | 69 |
| COSTIN: RUTH, MARIA, W | California | 21 |
| COSTIN: JOHN, MARY, MARGARET | Massachusetts | 27 |
| COSTIN: CHARLES, BETTY, CECIL | Florida | 44 |
| COSTINE: JOHN, ALFRED, ALMA | Florida | 42 |
| COSTINE: WILLIAM, ROBERT, JOHN | | 83 |
| ZACHARIAS : JONES, DASILVA, WOLLMAN | | 110 |
Based on public records. Inadvertent errors are possible.
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