TM
Thomas Mcmahon — 1920 US Census Record
Model Tree available1920 United States Federal Census · King, Washington
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in King, Washington (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a son (b.~1910), then head of a 5-person household.
Age 10
b. ~1910
Male
Son
Born: Washington
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | King, Washington |
| Surname | McMahon |
| Given Name | Thomas B Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Nebraska |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Township / Ward | Seattle |
| Est. Birth Year | ~1910 |
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.
5 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Lois Mcmahon | Daughter | — | 3 | ~1917 |
| Thomas Mcmahon | Son | — | 10 | ~1910 |
| Thomas Mcmahon | Head | — | 51 | ~1869 |
| Nora Mcmahon | Spouse | — | 35 | ~1885 |
| John Mcmahon | Son | — | 5 | ~1915 |
Census Appearances
1920
King, Washington
Son, age 10
King, Washington · implied b. ~1910 — 5 household members
| Surname | McMahon |
| Given Name | Thomas B Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Nebraska |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
King, Washington
Son, age 21
King, Washington · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MacMahon |
| Given Name | Thomas B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Nebraska |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
King-County, Washington
Head, age 31
King-County, Washington · implied b. ~1909 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | T. B. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Seattle City |
| 1935 Residence (County) | King |
| Occupation | Insurance Agent |
| Industry | Auto Insurance |
| Class of Worker | PW |
| Hours Worked | 45 |
| Income (1939) | 500 |
| Highest Grade | C 4 |
| 1935 Residence | Same place |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
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 Thomas Mcmahon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Mcmahon (~0.92 confidence) and father Thomas Macmahon (~0.92 confidence) and mother Nora Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Mcmahon
b. ~1869
Source father
● Household
· direct · ~0.92
Father
Thomas Macmahon
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Nora Mcmahon
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Son · 1920 · age 10 · b. ~1910 · Washington
★ You are viewing this record
Sibling
Lois Mcmahon
Sibling · 1920 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mcmahon
Sibling · 1920 · age 5
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
1920 US Federal Census — King, Washington
Open full size
1920 US Federal Census — King, Washington
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1926unit:1069)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Peter Gunderson | 75 | Head | Retired | Sweden |
| 52 | Augusta Gunderson | 62 | Wife | — | Sweden |
| 53 | Annie W Gunderson | 35 | Daughter | Stenographer | Rhode Island |
| 54 | Nellie C Gunderson | 33 | Daughter | Clerk | Rhode Island |
| 55 | Morton Lahlum | 44 | Head | Salesman | Norway |
| 56 | Constance Lahlum | 40 | Wife | — | Norway |
| 57 | Ella Lahlum | 14 | Daughter | — | Washington |
| 58 | Morton Lahlum | 12 | Son | — | Washington |
| 59 | William Hagland | 26 | Head | Electrician | Kansas |
| 60 | Lela Hagland | 47 | Mother | Clerk | Kansas |
| 61 | Ruth Hagland | 20 | Sister | Telephone Operator | Kansas |
| 62 | Frank M Smith | 33 | Head | Motorman | Pennsylvania |
| 63 | Anna Smith | 43 | Wife | — | Norway |
| 64 | Florence Smith | 19 | Daughter | Clerk | South Dakota |
| 65 | Edward Smith | 12 | Son | — | Washington |
| 66 | Ella Kinkead | 39 | Head | Stenographer | Nebraska |
| 67 | Laura Kinkead | 37 | Sister | — | Ohio |
| 68 | Thomas B Mcmahon | 51 | Head | Lawyer | Pennsylvania |
| 69 | Nora Mcmahon | 35 | Wife | — | Nebraska |
| 70 | Thomas B Jr Mcmahon THIS PERSON | 10 | Son | — | Washington |
| 71 | John Mcmahon | 5 | Son | — | Washington |
| 72 | Lois M Mcmahon | 3 | Daughter | — | Washington |
| 73 | Frank G Heideman | 46 | Head | Steamfitter | Missouri |
| 74 | Gertrude L Heideman | 39 | Wife | — | Arkansas |
| 75 | Goldie B Heideman | 19 | Daughter | Stenographer | Kansas |
| 76 | Raymond R Ray | 26 | Head | Office Clerk | Oregon |
| 77 | Estelle M Ray | 21 | Wife | — | Kansas |
| 78 | Roger C Ray | 1 | Son | — | Oregon |
| 79 | Donald P Mcdonald | 49 | Head | Clerk | Canada |
| 80 | Catherine P Mcdonald | 48 | Wife | Saleslady | Minnesota |
| 81 | Alice B Mcdonald | 22 | Daughter | School Teacher | Minnesota |
| 82 | John R Bechel | 42 | Head | Machinist | Missouri |
| 83 | Henrietta Bechel | 33 | Wife | — | Tennessee |
| 84 | Hurley Bechel | 14 | Son | — | Washington |
| 85 | Darby A Harwood | 55 | Head | Contractor | Indiana |
| 86 | Annie Harwood | 47 | Wife | — | Indiana |
| 87 | Willard R Harwood | 20 | Son | Truck Driver | Washington |
| 88 | Andrew Paulson | 74 | Head | Retired | Norway |
| 89 | Severine O Paulson | 64 | Wife | — | Norway |
| 90 | Olga B Paulson | 35 | Daughter | Clerk | Wisconsin |
| 91 | Sidney J Merton | 46 | Head | Salesman | England |
| 92 | Adell Merton | 45 | Wife | — | Canada |
| 93 | Lorna A Merton | 17 | Daughter | — | Washington |
| 94 | Ione R Merton | 14 | Daughter | — | Washington |
| 95 | George Stewart | 44 | Head | Laborer | Scotland |
| 96 | Christina Stewart | 41 | Wife | — | Scotland |
| 97 | Elizabeth Stewart | 15 | Daughter | — | Scotland |
| 98 | Isabella Stewart | 11 | Daughter | — | Scotland |
| 99 | John W Leach | 43 | Head | Packer | Missouri |
| 100 | Nellie M Leach | 38 | Wife | — | Kansas |
Related Census Records
Pedigree Summary
Thomas + 2 siblings
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)