| KOS |
| Name | State | Number of records |
| KOS: STANLEY, FRANK, JOSEPH | Illinois | 64 |
| JOHN KOS | | 31 |
| KOS: MARY, ANNA, ANTONIE | California | 32 |
| KOS: SOPHIE, JOSEPH, MARY | Massachusetts | 46 |
| KOS: KENNETH, MAMIE, C | Iowa | 30 |
| KOS: MARY, JOSEPH, ANGELINE | Ohio | 36 |
| KOSBAU: ALBERT, GARY, MINNIE | | 48 |
| KOSBERG: LILLIAN, WILLIAM, MARTIN | | 69 |
| KOSNAR: JOHN, MARIE, JOSEPH | | 37 |
| KOSNER: JAMES, JEAN, PHYLLIS | | 31 |
| KOSNICK: JOHN, MARGARET, JULIA | | 37 |
| KOSNIK: FRANK, HELEN, JOHN | | 95 |
| KOSNOSKI: MIKE, WILLIAM, JOHN | | 21 |
| CONCETTA C: ODONNELL, EVERTON, LIUZZO | | 82 |
| KOSUB: HELEN, MARY, ANTHONY | Texas | 97 |
| KOSUDA: JOHN, MICHAEL, JOSEPH | | 43 |
| KOSUT: JOHN, JOSEPH, MICHAEL | | 67 |
| KOSYDAR: JOSEPH, JOHN, MARY | | 56 |
| HILKO : VANDYK, LUTTERMAN, MEIN | | 20 |
| MIKOLA : CYMBRYLA, KOCIUBUK, KOSZAK | | 34 |
| KOSZALKA: JOHN, HELEN, EDWARD | | 57 |
| KOSZAREK: EDWARD, JOSEPH, ANNA | | 72 |
| KOSZEGI: JOSEPH, GEORGE, JOHN | | 31 |
| KOSZELA: RAYMOND, JOHN, STANLEY | | 53 |
| KOSZEWSKI: WILLIAM, LEO, JOSEPH | | 66 |
| KOSZUTA: JOSEPH, LEONARD, STANLEY | | 67 |
| KOSZYK: FRANK, JOHN, HELEN | | 72 |
Based on public records. Inadvertent errors are possible.
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