| OP |
| Name | State | Number of records |
| OPDAHL: DONALD, HAROLD, ARNOLD | Minnesota | 53 |
| OPDYCKE: JOHN, RUTH, WILLIAM | | 112 |
| OPDYKE: EDWARD, EARL, CARMEN | Florida | 23 |
| OPDYKE: JAMES, CHESTER, HELEN | New Jersey | 65 |
| OPFAR: DAVID, THOMAS, ELIZABETH | | 32 |
| OPFER: MARY, AUGUST, HENRY | Missouri | 39 |
| OPFER: THEODORE, GEORGE, LOUIS | Pennsylvania | 34 |
| OPFER: JOHN, ARNOLD, ARVILLA | Ohio | 34 |
| OPFERKUCH: JOHN, ROBERT, CHARLES | | 31 |
| OPFERMAN: ALBERT, JOHN, ESTHER | Pennsylvania | 50 |
| OPGENORTH: JOHN, HENRY, OLIVE | | 56 |
| OPHAUG: MABEL, OLAF, RUTH | | 44 |
| OPHEIM: ALICE, ALFRED, CONRAD | Minnesota | 64 |
| OPHEIM: JOSEPH, SELMA, BERNARD | Iowa | 40 |
| OPHER: JOHN, JOSEPH, ALBERT | | 79 |
| OPHUS: FERN, J, RUTH | | 58 |
| OPLIGER: PAUL, MARY, HARRY | | 43 |
| OPLINGER: JOHN, WILLIAM, MARY | Ohio | 35 |
| OPOCENSKY: FRED, EDWARD, PAUL | | 42 |
| OPOKA: MARY, JOSEPH, STANLEY | | 73 |
| OPOLKA: JOHN, JOSEPH, ANDREW | | 71 |
| OPOLSKI: JOSEPH, WALTER, CHESTER | | 39 |
| SAMUEL Z: WILSON, COHEN, COVINGTON | | 52 |
| OPRAY: CHARLES, FRANCIS, JOSEPH | | 35 |
| OPRE: LOUIS, JOSEPH, RAYMOND | | 34 |
| OPREA: JOHN, GEORGE, DANIEL | | 75 |
| OPREAN: GEORGE, JOHN, MIKE | | 36 |
| OPRENDEK: JOSEPH, JOHN, FREDERIC | | 35 |
| OPRIS: JOHN, MARY, VASILE | | 31 |
| OPRISKO: MICHAEL, GEORGE, DOLORES | | 38 |
| OPRY: ANDREW, LOUISE, JAMES | Louisiana | 38 |
| OPRY: WILLIAM, JOHN, JOSEPH | Texas | 52 |
| OPSAHL: CARL, THELMA, ANTOINETTE | California | 31 |
| OPSAHL: ALBIN, BERNARD, ADOLPH | Wisconsin | 34 |
| OPSAHL: AGNES, ARNOLD, ARTHUR | Minnesota | 89 |
| SELMER O: HUSELID, HASKIN, HALVORSON | | 31 |
| OPSAL: DONALD, ANDREW, BERNT | Minnesota | 33 |
| OPSETH: REUBEN, GUNDER, LEON | | 33 |
| OPSTAD: OSCAR, LORRAINE, IVER | | 62 |
| OPYT: JOHN, JOSEPHINE, FRANK | | 37 |
Based on public records. Inadvertent errors are possible.
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