WM
William Mcmahon — 1900 US Census Record
Linked across censuses1900 United States Federal Census · Merrimack, New Hampshire
Our Model Tree links this William Mcmahon across the 1900, 1910 and 1920 US Censuses in Merrimack, New Hampshire (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 3-person household.
Age 36
b. ~1864
Male
Head
Born: Ireland
Married
1900 Census Record Details
| Census Year | 1900 |
| Location | Merrimack, New Hampshire |
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Birth Month | June |
| Birth Year | 1864 |
| Year of Immigration | 1888 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Occupation | Car-inspector |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Car-Inspector |
| Township / Ward | Concord City |
| Est. Birth Year | ~1864 |
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 1900 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| James Mcmahon | Son | — | 13 | ~1887 |
| Susan Mcmahon | Spouse | — | 32 | ~1868 |
| William Mcmahon | Head | — | 36 | ~1864 |
Census Appearances
1900
Merrimack, New …
Head, age 36
Merrimack, New Hampshire · implied b. ~1864 — 3 household members
| Surname | McMahon |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Ireland |
| Birth Month | June |
| Birth Year | 1864 |
| Year of Immigration | 1888 |
| Naturalization Status | First papers filed |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Car-inspector |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1910
Merrimack, New …
Head, age 47
Merrimack, New Hampshire · implied b. ~1863 — 15 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Walter |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Ireland |
| Years Married | 24 |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Car inspector |
| Industry | Railroad |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1920
Merrimack, New …
Head, age 57
Merrimack, New Hampshire · implied b. ~1863 — 14 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | Walter |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 57 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1888 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Car Inspector |
| Industry | Steam Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | F |
| Birth Country | Ireland |
| Year of Naturalization | 1894 |
| 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 William Mcmahon across 3 US Census years (1900, 1910 and 1920) in Merrimack, New Hampshire, using XGBoost record linkage.
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This person
Anchor record
William Mcmahon
Head · 1900 · age 36 · b. ~1864 · New Hampshire
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1900 US Federal Census — Merrimack, New Hampshire
Open full size
1900 US Federal Census — Merrimack, New Hampshire
Page Contents
50 people indexed on this census page (ia:1900:12thcensusofpopu949unit:0463)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Mary O'Shea | 23 | Daughter | — | New Hampshire |
| 52 | George O'Shea | 19 | Son | — | New Hampshire |
| 53 | Peter O'Shea | 26 | Brother | Shop-Laborer | Canada |
| 54 | William May | 26 | Boarder | Shop-Laborer | New Hampshire |
| 55 | Felix Valley | 26 | Head | Shop-Laborer | Canada |
| 56 | Josephine Valley | 26 | Wife | — | Canada |
| 57 | Edward Valley | 2 | Son | — | New Hampshire |
| 58 | Philip Valley | 0 | Son | — | New Hampshire |
| 59 | Louis Stone | 22 | Boarder | Day-Laborer | Canada |
| 60 | Joseph Moses | 26 | Boarder | Day-Laborer | Egypt |
| 61 | Willis S. Walker | 57 | Head | Carpenter | New Hampshire |
| 62 | Regina Walker | 36 | Wife | — | Iowa |
| 63 | Candis Burns | 41 | Head | House-Keeper | New Hampshire |
| 64 | Leon B. Burns | 19 | Son | Baker | New Hampshire |
| 65 | Ruby M. Burns | 12 | Daughter | At School | New Hampshire |
| 66 | Geo. B. Mittridge | 54 | Boarder | Grocer | Massachusetts |
| 67 | Herman Schafer | 46 | Boarder | Barber | Massachusetts |
| 68 | James Maccarty | 36 | Head | Day-Laborer | Newfoundland |
| 69 | Mary J. Maccarty | 32 | Wife | — | Ireland |
| 70 | Joseph Cloutier | 28 | Head | Pay-Laborer | Canada |
| 71 | Rose D. Cloutier | 28 | Wife | — | Canada |
| 72 | Mary L. Cloutier | 7 | Daughter | — | Maine |
| 73 | Irene Cloutier | 6 | Daughter | — | Maine |
| 74 | Marie Cloutier | 3 | Daughter | — | Maine |
| 75 | Gertrude Cloutier | 2 | Daughter | — | New Hampshire |
| 76 | Beatrice Cloutier | 0 | Daughter | — | New Hampshire |
| 77 | George Willett | 38 | Head | Moulder-Helper | Maine |
| 78 | Annie F. Willett | 33 | Wife | — | Canada |
| 79 | Peter Willett | 9 | Son | — | New Hampshire |
| 80 | Laura Willett | 4 | Daughter | — | New Hampshire |
| 81 | Rosa Willett | 3 | Daughter | — | New Hampshire |
| 82 | Peter Odett | 49 | Head | Day-Laborer | Canada |
| 83 | Minnie Odett | 26 | Wife | — | Canada |
| 84 | Jane Odett | 6 | Daughter | — | New Hampshire |
| 85 | Louis Odett | 5 | Son | — | Canada |
| 86 | Sarah Odett | 3 | Daughter | — | New Hampshire |
| 87 | Joseph Odett | 1 | Son | — | Canada |
| 88 | Emma Savage | 11 | Sis Law | At School | Canada |
| 89 | Margaret Kelleher | 46 | Head | At Home | New Hampshire |
| 90 | Thomas F. Kelleher | 23 | Son | Printer | New Hampshire |
| 91 | Nellie Kelleher | 21 | Daughter | Dry-Goods-Clerk | New Hampshire |
| 92 | Mary M. Kelleher | 18 | Daughter | At Home | New Hampshire |
| 93 | Thomas Byrnes | 61 | Head | Day-Laborer | Ireland |
| 94 | Julia Byrnes | 49 | Wife | — | Ireland |
| 95 | James J. Byrnes | 18 | Son | News-Agent | New Hampshire |
| 96 | Maggie Byrnes | 15 | Daughter | At School | New Hampshire |
| 97 | Thomas J. Byrnes | 13 | Son | At School | New Hampshire |
| 98 | William Mcmahon THIS PERSON | 35 | Head | Car-Inspector | Ireland |
| 99 | Susan Mcmahon | 32 | Wife | — | Ireland |
| 100 | James Mcmahon | 12 | Son | At School | Ireland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1900 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)