TM
Thomas Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Pierce-County, Washington
Our Model Tree links this Thomas Mcmahon across the 1920, 1930 and 1940 US Censuses in Pierce-County, Washington (XGBoost, ~Confirmed), with identified parents Thomas & Thomas — first a head (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Male
Head
Born: Washington
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Pierce-County, Washington |
| Surname | McMahon |
| Given Name | Thomas J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Tacoma City |
| Additional Details | |
| Occupation | Bill Collector |
| Industry | Collection agency |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 480 |
| Highest Grade | C-2 |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
| Occupation | Bill Collector |
| Township / Ward | Tacoma City |
| Est. Birth Year | ~1915 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Thomas Mcmahon | Head | — | 25 | ~1915 |
| Dorothy Mcmahon | Spouse | — | 24 | ~1916 |
| Thomas Mcmahon | Son | — | 3 | ~1937 |
| Robert Mcmahon | Son | — | 2 | ~1938 |
Census Appearances
1920
Pierce, Washington
Son, age 5
Pierce, Washington · implied b. ~1915 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MacMahon |
| Given Name | Thomas Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1930
Pierce, Washington
Son, age 15
Pierce, Washington · implied b. ~1915 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MacMahon |
| Given Name | Thomas Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Washington |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Michigan |
| Industry | none |
| Can Read/Write | Yes |
| Birth State | Washington |
| Birth Country | United States |
| Birthplace (normalized) | washington |
1940
Pierce-County, Washington
Head, age 25
Pierce-County, Washington · implied b. ~1915 — 4 household members
| Surname | McMahon |
| Given Name | Thomas J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Washington |
| 1935 Residence (City) | Tacoma City |
| Occupation | Bill Collector |
| Industry | Collection agency |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 480 |
| Highest Grade | C-2 |
| 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 Macmahon (~0.92 confidence) and father Thomas Macmahon (~0.92 confidence) and mother Clara Macmahon (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Macmahon
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Thomas Macmahon
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Clara Macmahon
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Head · 1940 · age 25 · b. ~1915 · Washington
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Pierce-County, Washington
Open full size
1940 US Federal Census — Pierce-County, Washington
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-04391-00764)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George E. Pearson | 27 | Head | Locomotive Crane Operator | Minnesota |
| 2 | May N. Pearson | 28 | Wife | — | Washington |
| 3 | Thomas T. Morgan | 43 | Head | Cabinet Maker | So. Dakota |
| 4 | Nettie Morgan | 76 | Mother | — | So. Dakota |
| 5 | Thomas J. Mcmahon THIS PERSON | 25 | Head | Bill Collector | Washington |
| 6 | Dorothy E. Mcmahon | 24 | Wife | — | Idaho |
| 7 | Thomas J. Iii Mcmahon | 3 | Son | — | Washington |
| 8 | Robert A. Mcmahon | 2 | Son | — | Washington |
| 10 | Melvin B. Johnson | 50 | Head | Traveling Salesman | Michigan |
| 11 | Ruth G. Johnson | 40 | Wife | — | So. Dakota |
| 12 | Arnie E. Meyers | 48 | Head | Roadmaster | So. Dakota |
| 13 | Clarice A. Meyers | 43 | Wife | — | So. Dakota |
| 14 | Shirley E. Meyers | 17 | Daughter | — | Montana |
| 15 | William E. Weeks | 64 | Head | Inspector Of Equipment | Kentucky |
| 16 | Pearl T. Weeks | 57 | Wife | — | Wisconsin |
| 17 | Mark H. Canterbury | 26 | Nephew | Stenographer | Washington |
| 18 | Edward J. Shull | 34 | Head | Checker At Flour Mill | Washington |
| 19 | Rea N. Shull | 32 | Wife | — | Minnesota |
| 20 | Marian S. Shull | 5 | Daughter | — | Washington |
| 21 | Fred Klopfenstein | 41 | Head | President & Manager | Washington |
| 22 | Catherine E. Klopfenstein | 41 | Wife | — | Washington |
| 23 | F. Macrae Klopfenstein | 21 | Son | Student & Clerk | Washington |
| 24 | Bettie E. Klopfenstein | 19 | Daughter | — | Washington |
| 25 | Kay T. Klopfenstein | 10 | Daughter | — | Washington |
| 26 | Karen J. Klopfenstein | 7 | Daughter | — | Washington |
| 27 | Henry C. Gatlin | 75 | Father-in-law | Secretary | Iowa |
| 28 | John D. Macpherson | 81 | Boarder | Merchant | Scotland |
| 29 | Martha Peterson | 18 | Maid | Private House Maid | No. Dakota |
| 30 | George C. Weber | 55 | Head | Automobile Accountant | Illinois |
| 31 | Bertha A. Weber | 47 | Wife | — | Washington |
| 32 | Emily A. Weber | 18 | Daughter | — | Washington |
| 33 | Walter E. Blacksmith | 42 | Head | Electrician | Washington |
| 34 | Roxana B. Blacksmith | 37 | Wife | — | Washington |
| 35 | Barbara A. Blacksmith | 12 | Daughter | — | Washington |
| 36 | Carl R. Martinolich | 33 | Head | Shipbuilder | Washington |
| 37 | Mary A. Martinolich | 30 | Wife | — | Washington |
| 38 | Joan A. Martinolich | 6 | Daughter | — | Washington |
| 39 | Annette M. Martinolich | 5 | Daughter | — | Washington |
| 40 | Charles G. Martinolich | 3 | Son | — | Washington |
Pedigree Summary
Thomas
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 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)