| SURNAME | GIVEN NAME | MIDDLE |
| OAKES | Cad | |
| OATES | McKinley | |
| OBERCZ | Majk (Mike) | |
| OBERBEY | S | J |
| OVERBEY | S | J |
| ABRAMOVICH | Mark | |
| O’BRIEN | Frank | |
| O’BRIEN | Merle | J |
| O’BRIEN | Thos | J |
| O’BRIEN | Wm | C |
| OBROCK | Walter | H |
| OCHABA | Rudolf | |
| OCHVAD | Steve | |
| O’CONNELL | Loretta | |
| O’DAY | John | T |
| O’DONNELL | Charles | LeRoy |
| O’DONNELL | Clyde | Jerome |
| O’DONNELL | Daniel | |
| O’DONNELL | E | A |
| O’DONNELL | Ed | |
| O’DONNELL | Ernest | |
| O’DONNELL | Frank | J |
| O’DONNELL | P | J |
| O’DONNELL | Philip | |
| O’DONNELL | Stephen | |
| O’DONNELL | William | |
| O’DONNELL | William | J |
| OENCHUCK | Frank | |
| OESTERLING | C | A |
| OESTERLING | Earl | |
| OESTERLING | D | L |
| OESTERLING | James | E |
| OESTERLING | John | |
| OESTERLING | Leland | |
| OHL | Victor | Alonzo |
| OPFERMAN | John | H |
| OGLETREE | Edward | |
| OGRODNIK | John | |
| OGY | George | |
| OHAPEKO | Marcus | |
| OHARA | Frank | |
| OHARA | James | |
| OHL | Victor | |
| OHLSSON | Martin | |
| OHVAT | Steve | |
| OLEXSON | John | |
| OLIVER | J | Thornton |
| OLIVER | James | Thornton |
| OLIVER | Norman | L |
| OLSON | Ross | A |
| OLSEN | Ross | |
| O’NEIL | Hugh | |
| O’NEIL | Leo | J |
| ONEAL | P | H |
| OSTOPOVICH | Frank | |
| OLAH | Dan | |
| OLAH | John | |
| OLIHA | John | |
| OLANDO | Frank | |
| OLARCHICK | John | Frank |
| OLCHOSKY | J | |
| OLDAKER | Wesley | Wayne |
| OLEAKEWECH | M | |
| OLENIC | Paul | |
| OLENIK | John | |
| OLENITZ | John | |
| OLENSKI | Klemens | |
| OLESKEVECH | M | |
| OLESKO | John | |
| OLESko | Steve | |
| OLESOS | Tony | |
| OLEXA | John | |
| OLEXA | Andrew | |
| OLEXIA | John | |
| OLECXA | John | |
| OLEXSAK | Andrew | |
| OLEXSAK | Frank | Paul |
| OLEXSAK | Michael | A |
| OLEXSAK | Paul | |
| OLEXSAK | Sue | |
| OLENIK | John | |
| OLSHOVSKY | John | |
| OLSHANYSKY | Mike | |
| OLSHONIZKI | Peter | |
| OLSHOVSKI | Joe | |
| OLSHOVSKY | John | |
| OLSON | Clarence | H |
| OLSON | Ross | A |
| OLUCZCZOK | Mike | |
| OLUSCHUCK | John | |
| OLUSHEVSKI | Z | |
| OLZONITSKI | Michael | |
| ONUFER | Jack | |
| ONUFRAK | Frank | |
| ONUFRAK | Julia | |
| ONUFRAK | Mike | |
| ONASKY | Mike | |
| ONDEK | Andrew | |
| OPALKA | Leon | |
| OPFERMAN | A | J |
| OPFERMAN | John | H |
| OPPERMANN | Charles | J |
| OPPERMANN | Eugene | |
| OPPERMANN | Henry | L |
| OPPERMANN | James | |
| OPRISKA | Steve | |
| ORAN | Jesse | |
| ORAM | Paul | |
| ORESHAN | Miller | AKA Joe Rock |
| ORCSCCNIN | ||
| ORDY | Frank | |
| ORDY | Jack | |
| ORDY | Marie | |
| ORCOVETS | Frank | |
| ORAEVETS | Frank | |
| OSIPON | Steve | |
| ORIPOW | Steve | |
| ONISKO | Wasyli | |
| ORKA | John | |
| ORLANDO | Martino | |
| ORLOSKY | Edward | |
| ORLOWSKI | Andy | |
| ORLOWSKI | John | |
| ORLEKEVITZ | John | |
| ORLOSKY | Edward | |
| ORLOWSKI | John | |
| ORLOWSKI | Steve | |
| ORLOWSKI | Titus | |
| ORMOND | Joseph | S |
| OROCHOSKI | Michael | |
| OROWITZ | Alfred | Henry |
| OROWTZ | Erwin | |
| ORR | Clyde | L |
| ORR | Dan | W |
| ORR | David | |
| ORR | Mearle | |
| ORR | Oliver | |
| ORR | Francis | Paul |
| ORR | Raymond | L |
| ORR | Robert | L |
| ORSBORN | Herbert | E |
| OSBORN | A | C |
| OSBORNE | Clair | F |
| OSBORN | W | M |
| ORT | J | W |
| ORTOWSKI | Steve | |
| OSBORNE | H | E |
| OSBORNE | Lee | R |
| OSCHE | Arthur | Martin |
| OSCHE | Herman | |
| OSCHE | Leo | |
| OSCHE | Ralph | |
| OSCZPOK | Wasyl | |
| OSCPOFF | Steve | |
| OSHENICKI | John | |
| OSHROW | Peter | |
| OSHUA | John | |
| OSHUNIAK | Andy | |
| OSHUROK | Andy | |
| OSHURAK | Frank | |
| OSHURAK | John | |
| OSHURAK | Michael | |
| OSIPUK | Paul | |
| OSPIOTI | Steve | |
| OSTAFFIE | John | |
| OSTAMCHUK | Nicholas | |
| OSTAPOW | Sam | |
| OSTAPOVIC | Frenk | |
| OSTAS | Louis | |
| OSTERMAN | Peter | |
| OSTOFF | Isidor | |
| OSTRAVSKY | John | |
| OSTWINCH | John | |
| OSTWINCH | Stanley | |
| OSIPUK | Paul | |
| OSWALD | Edward | M |
| OSZYANI | Steve | |
| OSTANOVITCH | Mike | |
| OTT | Harry | |
| OTT | May | |
| OTTE | C | H |
| OTTERSON | Henry | S |
| OTTERSON | J | P |
| OTTERSON | John | P |
| OTTERSON | Henry | |
| OTTERSON | Lincoln | |
| OTTERSON | Lincoln | O |
| OTTO | Jack | |
| OVERHEIM | Ralph | |
| OVERLET | J | B |
| OWENS | Carroll | Courtland |
| OWENS | Floyd | |
| OWENS | James | |
| OWENS | John | |
| OWENS | R | C |
| OWEN | Ulyis | |
| OWINGS | George | R |