TM
Thomas Mcmahon — 1920 US Census Record
Model Tree available1920 United States Federal Census · Crawford, Iowa
Our Model Tree links this Thomas Mcmahon across the 1900, 1910 and 1920 US Censuses in Crawford, Iowa (XGBoost, ~Confirmed), with identified parents Maurice & Mary — first a son (b.~1896), then head of a 3-person household.
Age 24
b. ~1896
Male
Son
Born: Iowa
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Crawford, Iowa |
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Additional Details | |
| Occupation | Delivery |
| Industry | Groceries |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Delivery |
| Township / Ward | Denison City |
| Est. Birth Year | ~1896 |
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.
3 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| John Mcmahon | Son | — | 26 | ~1894 |
| Mary Mcmahon | Head | — | 52 | ~1868 |
| Thomas Mcmahon | Son | — | 24 | ~1896 |
Census Appearances
1900
Crawford, Iowa
Son, age 6
Crawford, Iowa · implied b. ~1894 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Iowa |
| Birth Month | Oct |
| Birth Year | 1894 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1910
Crawford, Iowa
Son, age 15
Crawford, Iowa · implied b. ~1895 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Crawford, Iowa
Son, age 24
Crawford, Iowa · implied b. ~1896 — 3 household members
| Surname | McMahon |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Occupation | Delivery |
| Industry | Groceries |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 (1900, 1910 and 1920) in Crawford, Iowa, using XGBoost record linkage. Identified parents: father Maurice Mcmahon (~0.92 confidence) and mother Mary Mcmahon (~0.92 confidence) and mother Mary Mcmahon (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Maurice Mcmahon
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Mary Mcmahon
b. ~1868
Source mother
● Household
· direct · ~0.92
Mother
Mary Mcmahon
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Mcmahon
Son · 1920 · age 24 · b. ~1896 · Iowa
★ You are viewing this record
Sibling
John Mcmahon
Sibling · 1920 · age 26
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 — Crawford, Iowa
Open full size
1920 US Federal Census — Crawford, Iowa
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu485unit:0485)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Hansen | 34 | Daughter | Teacher | Iowa |
| 2 | Russell Hansen | 28 | Son | Salesman | Iowa |
| 3 | Jessie Hansen | 26 | Daughter | Teacher | Iowa |
| 4 | Carl Buntrock | 38 | Head | — | Iowa |
| 5 | Anna Buntrock | 28 | Wife | — | Iowa |
| 6 | Ira Buntrock | 3 | Daughter | — | Iowa |
| 7 | Grace Buntrock | 1 | Daughter | — | Iowa |
| 8 | Hilda Timm | 19 | Servant | Servant | Iowa |
| 9 | Sophia Lehfeldt | 56 | Head | — | Iowa |
| 10 | Hertha Lehfeldt | 23 | Daughter | — | Iowa |
| 11 | Elder Lehfeldt | 21 | Son | Laborer | Iowa |
| 12 | Martha Lehfeldt | 20 | Daughter | Clerk | Iowa |
| 13 | Irene Lehfeldt | 17 | Daughter | — | Iowa |
| 14 | Carl Lehfeldt | 16 | Son | — | Iowa |
| 15 | Mary Mcmahon | 52 | Head | — | New York |
| 16 | John Mcmahon | 26 | Son | Clerk | Iowa |
| 17 | Thomas Mcmahon THIS PERSON | 24 | Son | Delivery | Iowa |
| 18 | William Frese | 47 | Head | Minister | New York |
| 19 | Elizabeth Frese | 42 | Wife | — | Indiana |
| 20 | Walter Frese | 13 | Son | — | Iowa |
| 21 | Ruth Frese | 10 | Daughter | — | Iowa |
| 22 | Alma Frese | 6 | Daughter | — | Iowa |
| 23 | Carl Frese | 3 | Son | — | Iowa |
| 24 | Michael Donahue | 79 | Head | — | Ireland |
| 25 | Bridget Donahue | 75 | Wife | — | Ireland |
| 26 | Nellie Collins | 29 | Daughter | Teacher | Iowa |
| 27 | Isabelle Collins | 27 | Daughter | Teacher | Iowa |
| 28 | William Wolf | 47 | Head | Freight Agent | Iowa |
| 29 | Grace Wolf | 46 | Wife | Car Clerk | Iowa |
| 30 | William F. Wolf | 17 | Son | Clerk | Iowa |
| 31 | Donald Wolf | 15 | Son | — | Iowa |
| 32 | Margaret Wolf | 12 | Daughter | — | Iowa |
| 33 | Ira P. Cassett | 66 | Head | Commissioner | Pennsylvania |
| 34 | Nina Cassett | 57 | Wife | — | Iowa |
| 35 | Alice Cassett | 32 | Daughter | Cashier | Iowa |
| 36 | Daisy Cassett | 23 | Daughter | Laborer | Iowa |
| 37 | Nellie Cassett | 21 | Daughter | Teacher | Iowa |
| 38 | Elsie Cassett | 18 | Daughter | — | Iowa |
| 39 | Elizabeth Hansen | 31 | Head | — | Iowa |
| 40 | Theresa Hansen | 69 | Mother | — | Germany |
| 41 | Julius Schroeder | 68 | Head | — | Germany |
| 42 | Hilda Schroeder | 21 | Daughter | — | Iowa |
| 43 | Olga Schroeder | 18 | Daughter | — | Iowa |
| 44 | William Detlefsen | 56 | Head | Janitor | Germany |
| 45 | Lilly Detlefsen | 48 | Wife | — | Germany |
| 46 | Peter Detlefsen | 86 | Father in law | — | Germany |
| 47 | John Slender | 62 | Head | — | Germany |
| 48 | Christina Slender | 55 | Wife | — | Iowa |
| 49 | Rudolph Slender | 24 | Son | Laborer | Iowa |
| 50 | Mary Slender | 17 | Daughter | Clerk | Iowa |
Pedigree Summary
Thomas + 1 sibling
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)