WM
William Mcmahon — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hamilton-County, Ohio
Our Model Tree links this William Mcmahon across the 1930 and 1940 US Censuses in Hamilton-County, Ohio (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 7-person household.
Age 21
b. ~1919
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Hamilton-County, Ohio |
| Surname | McMahon |
| Given Name | William A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Electrical |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 624 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Truck Driver |
| Township / Ward | Cincinnati |
| Est. Birth Year | ~1919 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Edward Mcmahon | Son | — | 13 | ~1927 |
| Howard Mcmahon | Son | — | 23 | ~1917 |
| Robert Mcmahon | Son | — | 15 | ~1925 |
| Howard Mcmahon | Head | — | 43 | ~1897 |
| John Mcmahon | Son | — | 19 | ~1921 |
| Anna Mcmahon | Spouse | — | 43 | ~1897 |
| William Mcmahon | Son | — | 21 | ~1919 |
Census Appearances
1930
Hamilton, Ohio
Son, age 11
Hamilton, Ohio · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Hamilton-County, Ohio
Son, age 21
Hamilton-County, Ohio · implied b. ~1919 — 7 household members
| Surname | McMahon |
| Given Name | William A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cincinnati |
| 1935 Residence (County) | Hamilton |
| Occupation | Truck Driver |
| Industry | Electrical |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 624 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links William Mcmahon across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
William Mcmahon
Son · 1940 · age 21 · b. ~1919 · Ohio
★ You are viewing this record
Sibling
Howard Mcmahon
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcmahon
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Mcmahon
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcmahon
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Hamilton-County, Ohio
Open full size
1940 US Federal Census — Hamilton-County, Ohio
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-03190-00646)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Arlene Frank | 6 | Daughter | — | Ohio |
| 42 | Mary E Kenney | 56 | Head | — | Ohio |
| 43 | Katherine G Kenney | 30 | Daughter | Clerk | Ohio |
| 44 | William E Kenney | 23 | Son | Machinist | Ohio |
| 45 | Bernard K Kenney | 21 | Son | Accountant | Ohio |
| 46 | Jesse M Frank | 47 | Head | Butcher | Tennessee |
| 47 | Pearl L Frank | 48 | Wife | — | Ohio |
| 48 | Mildred Frank | 23 | Daughter | Salesgirl | Ohio |
| 49 | Joseph Frank | 22 | Son | — | Kentucky |
| 50 | John W Molloy | 54 | Head | Watchman | Ohio |
| 51 | Alice M Molloy | 54 | Wife | — | Ohio |
| 52 | John G Molloy | 16 | Son | — | Ohio |
| 53 | Anna R Kennedy | 45 | Sister Law | — | Ohio |
| 54 | Edward Daugherty | 51 | Head | Laborer | Kentucky |
| 55 | Lulu Daugherty | 54 | Wife | — | Ohio |
| 56 | Helen Y Daugherty | 26 | Daughter | Packer | Ohio |
| 57 | James H York | 66 | Head | Stationary Fireman | Kentucky |
| 58 | Leola M York | 49 | Wife | — | Ohio |
| 59 | Clara M Hille | 60 | Head | — | Ohio |
| 60 | Elizabeth Ann Hille | 58 | Sister | Saleslady | Ohio |
| 61 | George W Burkhardt | 74 | Head | Retired | Ohio |
| 62 | Elizabeth Williams | 61 | Sister-Law | — | England |
| 63 | Edith W Williams | 54 | Lodger | Clerk | Ohio |
| 64 | Matilda Pettit | 71 | Head | — | Ohio |
| 65 | Reuben Pettit | 51 | Son | Surveyor | Ohio |
| 66 | Clarence Van Pelt | 27 | Head | Meatcutter | Ohio |
| 67 | Ruth B Van Pelt | 25 | Wife | — | Ohio |
| 68 | James C Van Pelt | 2 | Son | — | Ohio |
| 69 | Virginia Freeman | 24 | Sister Law | — | Ohio |
| 70 | Mack D Freeman | 27 | Brother Law | Laborer | Kentucky |
| 71 | Donald Freeman | 1 | Nephew | — | Ohio |
| 72 | Nannie Chaney | 68 | Grandmother | — | Kentucky |
| 73 | Howard J Mcmahon | 43 | Head | Restaurant Chef | Ohio |
| 74 | Anna L Mcmahon | 43 | Wife | — | Ohio |
| 75 | Howard Jr Mcmahon | 23 | Son | Printer | Ohio |
| 76 | William A Mcmahon THIS PERSON | 21 | Son | Truck Driver | Ohio |
| 77 | John J Mcmahon | 19 | Son | Mailer | Ohio |
| 78 | Robert F Mcmahon | 15 | Son | — | Ohio |
| 79 | Edward D Mcmahon | 13 | Son | — | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)