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John Mcmahon — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Middlesex, Massachusetts
Our Model Tree links this John Mcmahon across the 1900, 1910 and 1920 US Censuses in Middlesex, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1861), then head of a 5-person household.
Age 59
b. ~1861
Male
Head
Born: Ireland
Married
1920 Census Record Details
| Census Year | 1920 |
| Location | Middlesex, Massachusetts |
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1882 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Fireman |
| Industry | City of Lowell |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Ireland |
| Year of Naturalization | 1888 |
| Birthplace (normalized) | ireland |
| Occupation | Fireman |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1861 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Mcmahon | Head | — | 59 | ~1861 |
| Edward Mcmahon | Son | — | 25 | ~1895 |
| Joseph Mcmahon | Son | — | 29 | ~1891 |
| Paul Mcmahon | Son | — | 27 | ~1893 |
| Maria Mcmahon | Spouse | — | 49 | ~1871 |
Census Appearances
1900
Middlesex, Massachusetts
Head, age 36
Middlesex, Massachusetts · implied b. ~1864 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Birth Month | Nov |
| Birth Year | 1864 |
| Year of Immigration | 1875 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Stationary Fireman |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1910
Middlesex, Massachusetts
Head, age 47
Middlesex, Massachusetts · implied b. ~1863 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | MacMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Ireland |
| Years Married | 23 |
| Year of Immigration | 1881 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Fireman |
| Industry | Pumping Station |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
Middlesex, Massachusetts
Head, age 59
Middlesex, Massachusetts · implied b. ~1861 — 5 household members
| Surname | McMahon |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1882 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Fireman |
| Industry | City of Lowell |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | Ireland |
| Year of Naturalization | 1888 |
| Birthplace (normalized) | ireland |
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 John Mcmahon across 3 US Census years (1900, 1910 and 1920) in Middlesex, Massachusetts, using XGBoost record linkage.
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This person
Anchor record
John Mcmahon
Head · 1920 · age 59 · b. ~1861 · Massachusetts
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Middlesex, Massachusetts
Open full size
1920 US Federal Census — Middlesex, Massachusetts
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu711unit:1064)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Mary Gowencher | 62 | Aunt | — | Massachusetts |
| 52 | Clayton Stoddard | 45 | Head | Proprietor | Vermont |
| 53 | Vashti Stoddard | 41 | Wife | None | Canada |
| 54 | Clement Stoddard | 17 | Son | None | Massachusetts |
| 55 | Vera Stoddard | 15 | Daughter | None | Massachusetts |
| 56 | Hazel Stoddard | 13 | Daughter | None | Massachusetts |
| 57 | Lois Stoddard | 4 | Daughter | None | Massachusetts |
| 58 | Ezekiel Savage | 76 | Father-in-law | Retired | Canada |
| 59 | Catherine Savage | 66 | Mother-in-law | None | Canada |
| 60 | Alfred Leblanc | 75 | Head | Retired | Canada |
| 61 | Zoe Leblanc | 55 | Wife | None | Canada |
| 62 | Mary L. Pare | 15 | Step-Daughter | Lacer | Connecticut |
| 63 | Anna V. Crowe | 38 | Head | Cutter | Ireland |
| 64 | Louis Giftees | 42 | Head | Manufacturer | Greece |
| 65 | Helen Giftees | 36 | Wife | None | Greece |
| 66 | Peter Giftees | 11 | Son | None | Massachusetts |
| 67 | Fred Giftees | 10 | Son | None | Massachusetts |
| 68 | William L. Galloway | 27 | Head | Barber | England |
| 69 | Annie Galloway | 25 | Wife | None | England |
| 70 | Mary Vining | 77 | Head | None | New York |
| 71 | Mary Welch | 66 | Head | None | England |
| 72 | Ellen Welch | 32 | Daughter | Grader | Massachusetts |
| 73 | Anna Welch | 21 | Daughter | Buttoner | Massachusetts |
| 74 | James Mayo | 47 | Head | Belt Maker | Canada |
| 75 | Catherine Mayo | 47 | Wife | None | Massachusetts |
| 76 | Madeline Mayo | 18 | Daughter | Bookkeeper | New York |
| 77 | Romuald Livaillon | 31 | Head | Operative | Canada |
| 78 | Alice Livaillon | 29 | Wife | None | Canada |
| 79 | Raymond Livaillon | 4 | Son | None | Massachusetts |
| 80 | Albert Broadbent | 52 | Head | Fireman | New Hampshire |
| 81 | Helen M. Broadbent | 15 | Daughter | None | Massachusetts |
| 82 | Annie Knowles | 57 | Sister-in-law | None | Massachusetts |
| 83 | Grace Knowles | 25 | Niece | Saleslady | Massachusetts |
| 84 | Alice Mcdonald | 35 | Sister-in-law | Presser | Massachusetts |
| 85 | Edward C. Taylor | 45 | Head | Machinist | Massachusetts |
| 86 | Grace Taylor | 39 | Wife | None | Massachusetts |
| 87 | Harriet E. Taylor | 43 | Sister | Saleslady | Massachusetts |
| 88 | Edgar J. Mellows | 55 | Head | Asst Engineer | Maine |
| 89 | Elizabeth Mellows | 46 | Wife | None | Denmark |
| 90 | Angur Ottosen | 36 | Brother-in-law | Salesman | Denmark |
| 91 | George B. Stoddard | 70 | Head | Salesman | Vermont |
| 92 | Augusta Stoddard | 67 | Wife | None | Vermont |
| 93 | Ruth Paton | 16 | Lodger | Saleslady | Massachusetts |
| 94 | Oscar H. Jensen | 26 | Head | Laborer | Massachusetts |
| 95 | Clara Jensen | 22 | Wife | None | Vermont |
| 96 | John Mcmahon THIS PERSON | 59 | Head | Fireman | Ireland |
| 97 | Maria Mcmahon | 49 | Wife | None | Ireland |
| 98 | Joseph H. Mcmahon | 29 | Son | Conductor | Massachusetts |
| 99 | Paul F. Mcmahon | 27 | Son | Motorman | Massachusetts |
| 100 | Edward Mcmahon | 25 | Son | Machinist | Massachusetts |
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)