WM
William Mcdonald — 1940 US Census Record
Model Tree available1940 United States Federal Census · Merrimack-County, New Hampshire
Our Model Tree links this William Mcdonald across the 1910, 1920, 1930 and 1940 US Censuses in Merrimack-County, New Hampshire (XGBoost, ~Confirmed), with identified parents Charles & Margaret — first a son (b.~1898), then head of a 7-person household.
Age 42
b. ~1898
Male
Son
Born: New Hampshire
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Merrimack-County, New Hampshire |
| Surname | MCDONALD |
| Given Name | WILLIAM A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Concord city |
| 1935 Residence (County) | Merrimack |
| Additional Details | |
| Occupation | brakeman |
| Industry | steam railroad |
| Class of Worker | PW |
| Income (1939) | 1060 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Occupation | Brakeman |
| Township / Ward | Concord City |
| Est. Birth Year | ~1898 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Mary Mcdonald | Daughter | — | 39 | ~1901 |
| Katherine Mcdonald | Daughter | — | 51 | ~1889 |
| Abbie Mcdonald | Daughter | — | 54 | ~1886 |
| Margaret Mcdonald | Head | — | 76 | ~1864 |
| Mary Mcdonald | Other | — | 80 | ~1860 |
| Edward Mcdonald | Son | — | 41 | ~1899 |
| William Mcdonald | Son | — | 42 | ~1898 |
Census Appearances
1910
Merrimack, New …
Son, age 12
Merrimack, New Hampshire · implied b. ~1898 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1920
Merrimack, New …
Son, age 23
Merrimack, New Hampshire · implied b. ~1897 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Occupation | Clerk |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1930
Merrimack, New …
Son, age 32
Merrimack, New Hampshire · implied b. ~1898 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonald |
| Given Name | William A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | New Hampshire |
| Mother's Birthplace | New Hampshire |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Merrimack-County, New …
Son, age 42
Merrimack-County, New Hampshire · implied b. ~1898 — 7 household members
| Surname | MCDONALD |
| Given Name | WILLIAM A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Concord city |
| 1935 Residence (County) | Merrimack |
| Occupation | brakeman |
| Industry | steam railroad |
| Class of Worker | PW |
| Income (1939) | 1060 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
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 Mcdonald across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Mcdonald (~0.92 confidence) and mother Margaret Mcdonald (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Mcdonald
b. ~1861
Source father
● Household
· direct · ~0.92
Mother
Margaret Mcdonald
b. ~1864
Source mother
● Household
· direct · ~0.92
This person
Anchor record
William Mcdonald
Son · 1940 · age 42 · b. ~1898 · New Hampshire
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Sibling
Katherine Mcdonald
Sibling · 1940 · age 51
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Mcdonald
Sibling · 1940 · age 39
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Mcdonald
Sibling · 1940 · age 41
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Abbie Mcdonald
Sibling · 1940 · age 54
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
1940 US Federal Census — Merrimack-County, New Hampshire
Open full size
1940 US Federal Census — Merrimack-County, New Hampshire
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-02293-00677)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen T. Mahoney | 43 | Nun | Teacher | Massachusetts |
| 2 | Margaret M. Markey | 31 | Nun | Teacher | England |
| 3 | Evelyn V. Oliviero | 25 | Nun | Teacher | Massachusetts |
| 4 | Madeleine S. Rafter | 56 | Nun | Teacher | Maine |
| 5 | Katherine Sullivan | 46 | Nun | Teacher | Eire |
| 6 | Mary J. Trainor | 67 | Nun | Teacher | New Hampshire |
| 7 | Onisa A. Whelan | 56 | Nun | Teacher | Ireland |
| 8 | Mary E. Sullivan | 34 | Nun | Teacher | Massachusetts |
| 10 | Margaret Mcdonald | 76 | Head | — | New Hampshire |
| 11 | Abbie T. Mcdonald | 54 | Daughter | Elementary Grade Teacher | New Hampshire |
| 12 | Katherine A. Mcdonald | 51 | Daughter | Cashier | New Hampshire |
| 13 | William A. Mcdonald THIS PERSON | 42 | Son | Brakeman | New Hampshire |
| 14 | Edward J. Mcdonald | 41 | Son | Timekeeper | New Hampshire |
| 15 | Mary E. Mcdonald | 39 | Daughter | — | New Hampshire |
| 16 | Mary A. Mcdonald | 80 | Sister | — | New Hampshire |
| 17 | Solon G. Millen | 46 | Head | Steamfitter | New Hampshire |
| 18 | Ida A. Millen | 45 | Wife | — | New Hampshire |
| 19 | Catherine A. Millen | 15 | Daughter | — | New Hampshire |
| 20 | Mary E. Sullivan | 70 | Head | — | Maine |
| 21 | Ivo M. Noyes | 50 | Head | Locomotive Engineer | New Hampshire |
| 22 | Minnie L. Noyes | 47 | Wife | Servant | New Hampshire |
| 23 | Adin M. Noyes | 25 | Son | Binder Room Worker | New Hampshire |
| 24 | Willie E. Sawyer | 31 | Lodger | — | New Hampshire |
| 25 | Agnes J. Fowler | 74 | Mother-in-law | — | New Hampshire |
| 26 | John E. Barry | 38 | Head | Salesman | Maine |
| 27 | Eleanor V. Barry | 29 | Wife | — | Maine |
| 28 | Winona Miller | 26 | Head | Waitress | New Hampshire |
| 29 | Leonel E. Miller | 4 | Son | — | New Hampshire |
| 30 | Gordon F. Miller | 2 | Son | — | New Hampshire |
| 31 | Marion Georgina | 18 | Sister | — | New Hampshire |
| 32 | Charles A. Georgina | 2 | Nephew | — | New Hampshire |
| 33 | Marjorie G. Davis | 23 | Head | Waitress | Massachusetts |
| 34 | Elaine S. Davis | 22 | Sister | Card Engraver | Massachusetts |
| 37 | Albert C. Ouellette | 48 | Head | Laborer | New Hampshire |
| 38 | Corrine B. Ouellette | 45 | Wife | — | New Hampshire |
| 39 | Dennis T. Ouellette | 15 | Son | — | New Hampshire |
| 40 | Helen M. Ouellette | 12 | Daughter | — | New Hampshire |
Related Census Records
Pedigree Summary
William + 4 siblings
Gen 1 · 2 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)